USGS Newsroom

USGS Study Confirms U.S. Amphibian Populations Declining at Precipitous Rates

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 22 May 2013 16:59:00 EDT

CORVALLIS, Ore. — The first-ever estimate of how fast frogs, toads and salamanders in the United States are disappearing from their habitats reveals they are vanishing at an alarming and rapid rate.

According to the study released today in the scientific journal PLOS ONE, even the species of amphibians presumed to be relatively stable and widespread are declining. And these declines are occurring in amphibian populations everywhere, from the swamps in Louisiana and Florida to the high mountains of the Sierras and the Rockies.

The study by USGS scientists and collaborators concluded that U.S. amphibian declines may be more widespread and severe than previously realized, and that significant declines are notably occurring even in protected national parks and wildlife refuges.

"Amphibians have been a constant presence in our planet's ponds, streams, lakes and rivers for 350 million years or so, surviving countless changes that caused many other groups of animals to go extinct," said USGS Director Suzette Kimball. "This is why the findings of this study are so noteworthy; they demonstrate that the pressures amphibians now face exceed the ability of many of these survivors to cope."

On average, populations of all amphibians examined vanished from habitats at a rate of 3.7 percent each year. If the rate observed is representative and remains unchanged, these species would disappear from half of the habitats they currently occupy in about 20 years. The more threatened species, considered "Red-Listed" in an assessment by the global organization International Union for Conservation of Nature, disappeared from their studied habitats at a rate of 11.6 percent each year. If the rate observed is representative and remains unchanged, these Red-Listed species would disappear from half of the habitats they currently occupy in about six years.

"Even though these declines seem small on the surface, they are not," said USGS ecologist Michael Adams, the lead author of the study. "Small numbers build up to dramatic declines with time. We knew there was a big problem with amphibians, but these numbers are both surprising and of significant concern."

For nine years, researchers looked at the rate of change in the number of ponds, lakes and other habitat features that amphibians occupied. In lay terms, this means that scientists documented how fast clusters of amphibians are disappearing across the landscape.

In all, scientists analyzed nine years of data from 34 sites spanning 48 species. The analysis did not evaluate causes of declines.

The research was done under the auspices of the USGS Amphibian Research and Monitoring Initiative, which studies amphibian trends and causes of decline. This unique program, known as ARMI, conducts research to address local information needs in a way that can be compared across studies to provide analyses of regional and national trends.

Brian Gratwicke, amphibian conservation biologist with the Smithsonian Conservation Biology Institute, said, "This is the culmination of an incredible sampling effort and cutting-edge analysis pioneered by the USGS, but it is very bad news for amphibians. Now, more than ever, we need to confront amphibian declines in the U.S. and take actions to conserve our incredible frog and salamander biodiversity."

The study offered other surprising insights. For example, declines occurred even in lands managed for conservation of natural resources, such as national parks and national wildlife refuges.

"The declines of amphibians in these protected areas are particularly worrisome because they suggest that some stressors – such as diseases, contaminants and drought – transcend landscapes," Adams said. "The fact that amphibian declines are occurring in our most protected areas adds weight to the hypothesis that this is a global phenomenon with implications for managers of all kinds of landscapes, even protected ones."

Amphibians seem to be experiencing the worst declines documented among vertebrates, but all major groups of animals associated with freshwater are having problems, according to Adams. While habitat loss is a factor in some areas, other research suggests that things like disease, invasive species, contaminants and perhaps other unknown factors are related to declines in protected areas.

"This study," said Adams, "gives us a point of reference that will enable us to track what's happening in a way that wasn’t possible before."

Read FAQs about this research

The publication, Trends in amphibian occupancy in the United States, is authored by Adams, M.J., Miller, D.A., Muths, E., Corn, P.S., Campbell Grant, E.H., Bailey, L., Fellers, G.M., Fisher, R.N., Sadinski, W.J., Waddle, H., and Walls, S.C., and is available to the public.

Read a USGS blog, Front-row seats to climate change, about 3 other recent USGS amphibian studies. For more information about USGS amphibian research, visit http://armi.usgs.gov/

New Publication Tells Western Fisheries Research Center's History of Innovation

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 16 May 2013 13:00:00 EDT

SEATTLE — The U.S. Geological Survey's Western Fisheries Research Center (WFRC), headquartered in Seattle, has led cutting-edge research on fish and aquatic environments for nearly 80 years – first in the Pacific Northwest, then nationwide and throughout the world. WFRC’s history of research and innovation is captured in a new publication, "Seventy-Five Years of Science: The Story of the Western Fisheries Research Center 1935-2010," by WFRC emeritus scientist Gary A. Wedemeyer.

The WFRC began in the Great Depression as an effort to understand and control the fish diseases that limited the success of hatcheries founded to mitigate the Grand Coulee Dam's destruction of salmon runs in the Columbia River basin. As environmental issues grew more complex and the effects of terrestrial ecology on marine ecology became better understood, the WFRC expanded with a multidisciplinary approach that now draws on the expertise of ecologists, microbiologists, and geneticists as well as fisheries biologists and other scientists. Its six laboratories – in Seattle; on Marrowstone Island and in the Columbia River Gorge, Wash., in Klamath Falls and Newport, Ore., and in Reno, Nev. – provide the technical information that natural resource managers need to ensure the continued survival of fish and fish populations in the western United States. Because food webs, aquatic communities, and ecosystems know no borders, WFRC research is relevant worldwide.

"The WFRC has a proud tradition of solving problems that negatively impact aquatic ecosystems," said WFRC Center Director Jill Rolland. "Working here is both an honor and a responsibility that our employees take seriously."

But it all started in 1935, when the appropriately named biologist Frederic F. Fish was tapped by the U.S. Bureau of Fisheries to found a dedicated lab in the basement of their Seattle laboratory – a "hospital for fish," as an article in a 1939 issue of Newsweek dubbed the novel project. Important discoveries emerged from Fish’s lab from the start.

"These discoveries became the basis for the hatchery operations needed to ensure the continued survival of economically important fish and fish populations both in the United States and abroad," Wedemeyer said.

WFRC research toward recovery plans for endangered species has led to the successful establishment of self-sustaining fish populations in U.S. desert aquatic ecosystems. Other projects have proven critical to the continued survival of Pacific salmon and sturgeon populations throughout the U.S. portion of the Columbia River basin in five Western states. The Center was part of the U.S. Fish and Wildlife Service until 1996, when it came under the aegis of the USGS.

WFRC's history of innovation continues. Since 2008, the Coast Salish Nation and Swinomish Indian Tribal Community have partnered with WFRC on the Coast Salish Tribal Water Quality Project, which blends science and Coast Salish cultural practices to study water quality and its effects on an ecosystem that supports orcas, salmon and other culturally important species. WFRC scientists are studying fish populations and ecosystems within the Elwha River Restoration Project, the largest dam removal project in U.S. history. Others are developing acoustic imaging techniques to safely monitor the endangered Delta smelt, whose status is an ecological bellwether for a region critical to California's economy. Still others are developing strategies to fight the ecological and economic damage wrought by invasive aquatic species introduced into U.S. waters in the ballast tanks of ocean-going ships. WFRC is an International Reference Laboratory for the World Organization of Animal Health in Paris, and its scientists assist more than 170 WOAH member countries to establish effective fish disease control programs.

The publication "Seventy-Five Years of Science: The Story of the Western Fisheries Research Center 1935-2010" is available online. Video of Wedemeyer talking about WFRC is available here.

Spring 2012 Earliest on Record

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 15 May 2013 13:25:26 EDT

March 2012 set records for warm temperatures that promoted early leafing and flowering across large areas of the United States. A team of scientists at the USA National Phenology Network, which is sponsored by the U.S. Geological Survey, have published a study which shows that 2012 was the earliest spring over the 48 U.S. states since 1900 when systematic weather data began to be available for the entire area.

Phenology is the study of recurring plant and animal life cycle stages, especially their timing and relationships with weather and climate. Assessing the severity and impacts of such extreme climatic events, either in the past or as they happen, requires consistent indicators of variability and change that can be mapped both nationally and historically.

The USA National Phenology Network provides a suite of "spring indices" based on the accumulated warmth needed to end dormancy and initiate growth in many native and cultivated plants. These complex, evidence-based algorithms can be calculated for any weather station that records daily maximum and minimum temperatures. Spring indices are independently validated using historical observations of leafing and flowering in lilac and honeysuckle nationwide.

The historical trend of spring indices suggests that the 2012 growing season advanced as much as 20-30 days in the East and Midwest from the 1900-2012 long-term mean.

"The results of this study clearly demonstrate the great importance of long-term monitoring of natural processes. A long record allows us to identify patterns of change that we might otherwise miss," said Suzette Kimball, acting USGS Director.

Today the response of vegetation to temperature and precipitation can be readily observed across wide areas by Earth-observing satellites at intervals of only a few days. USGS scientist Julio Betancourt, a co-author of the study, noted, "Indicators such as spring indices and satellite-based evaluations of vegetation growth will become essential tools for assessing climate variability and change and their impacts."

Satellite data show that the cumulative effects of the unusually early 2012 spring were most pronounced across the Corn Belt, the western Great Lakes region, and the northeastern U.S.

The beneficial effects of spring's quick start in 2012 were subsequently offset by a late spring frost and summer drought. In fact, the unusually early spring combined with late frosts in April to produce a so-called "false spring" that damaged fruit trees across the Upper Midwest and Great Lakes regions.

The study appears in EOS, Transactions of the American Geophysical Union.

Learn more

AMERICA'S GREAT OUTDOORS: USGS Economic Analysis of Anacostia River Shows Potential Value of Restoring Urban Streams Nationwide

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 2 May 2013 9:44:14 EDT

Case Study Demonstrates How Restoring a Stream Can Help Restore a Community

WASHINGTON, D.C.-- The U.S. Geological Survey today released an analysis of the Watts Branch of the Anacostia River in Prince Georges County, Md. and Washington, D.C. that documents how restoration work on this urban tributary has had a substantial impact on the local economy, directly or indirectly accounting for 45 jobs, $2.6 million in local labor income and $3.4 million in value added to the local D.C. metropolitan area in 2011.

"The USGS study confirms the value of re-greening our urban landscapes around the nation," said David J. Hayes, Deputy Secretary of the Interior. "Restoring one of the most degraded urban streams in the Anacostia watershed while also addressing sewage infrastructure benefited a struggling local economy, provided an improved park and green space for residents, and enhanced wildlife habitat. Restoring a stream is helping restore a community and demonstrates the power of partnerships."

The Anacostia watershed is one of the priority areas for interagency cooperation in both President Obama's America's Great Outdoors Initiative and the Urban Waters Federal Partnership.

D.C. and federal agencies formed the Watts Branch restoration partnership in 2010 to restore a segment of one of the most urbanized watersheds in the Chesapeake Bay drainage basin. Completed in 2011, the restoration project was funded largely by the District of Columbia's Department of Environment and also carried out by the Department of the Interior's U.S. Fish and Wildlife Service along with the National Park Service, the U.S. Department of Agriculture's Natural Resources Conservation Service, the U.S. Environmental Protection Agency, Washington Water and Sewer and several local organizations.

The partnership has addressed both environmental degradation and sewage infrastructure needs of the Watts Branch, which originates in the Capitol Heights area of Prince George's County, flowing almost 5 miles to the Anacostia, which drains to the Potomac River and Chesapeake Bay.

The analysis, conducted by USGS economists Catherine Cullinane Thomas and Elizabeth Myrick, found that restoring Watts Branch had a substantial impact on the local economy. The restoration directly accounted for 26 jobs and more than $1.5 million in local labor income including salaries, wages and benefits and $1.5 million in local value added (the contribution of expenditures to Gross Domestic Product). Moreover, the restoration indirectly supported an additional 19 jobs, providing an additional $1.1 million in labor income and $1.9 in value added to the local economy. Restoring Watts Branch contributed more than $3 million to a struggling local economy.

"This restoration project shows the fiscal and transformative power of re-greening urban areas—supporting local jobs, upgrading infrastructure, and helping improve the local economy," said Hayes, noting that the Watts study is one of a number of case studies on the impact of restoration projects in other parts of the country. "With a roughly $2 trillion backlog in infrastructure needs nationwide, our country has a tremendous opportunity to advance both economic and environmental goals through other restoration projects."

The U.S. Fish and Wildlife Service and other partners not only restored the eroded stream channel, which was depositing nearly 1,500 tons of sediment into the Anacostia watershed each year, but also relocated and improved sewer lines to address and prevent future sewage leaks. Infrastructure and environmental restoration improved water quality, increased floodplain storage, reduced erosion and improved in-stream habitat to support fish like American eel, alewife and American shad. Local residents regained a beautiful urban stream, and habitat along the stream also improved for birds such as warblers, barred owls and great blue herons, to name just a few.

Moreover, local communities have seen utility and street upgrades. A local nonprofit, Washington Parks and People, has begun using Watts Branch as an outdoor classroom to prepare an emerging workforce for jobs in urban and community forestry.

"The Watt's Branch restoration turned a degraded stream into an urban sanctuary within an underserved community," the analysis concluded.

President Obama's America’s Great Outdoors Initiative is a conservation agenda for the 21^st century. It underscores how urban parks and community green spaces can contribute to the social, physical, economic and emotional health of America's communities. The Anacostia is one of the priority areas chosen under America’s Great Outdoors.

The Anacostia River Watershed also is one of the original pilot project areas of the interagency Urban Waters Federal Partnership led by EPA. Through this partnership, the Interior Department and 10 other federal departments work to reconnect urban areas—particularly those that are overburdened or economically distressed—with their waterways through improved collaboration.

Rising Seas Could Threaten Many Acadia NP Marshes

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 29 Apr 2013 14:06:12 EDT

The report and maps are available online.

AUGUSTA, Maine – More than 800 acres of uplands in and near Acadia National Park will likely be flooded by the ocean if sea level rises 2 feet during this century, leaving 75 percent of the saltwater marshes along this part of central Maine's rugged coast with very little upland area to migrate into, according to a new U.S. Geological Survey study and maps.

If plant material and sediments can accumulate in Maine's salt marshes fast enough to keep pace with sea-level rise, the uplands could provide areas for new salt marsh habitat. But that would require faster accumulation rates than those observed in the last century.

"The precise amount of sea-level rise that we should expect this century is not known," said USGS scientist Martha Nielsen, who led the study. "This report and maps are intended to inform decision makers with science to assist in planning for an uncertain future. By identifying the uplands that could support new salt marshes ahead of time, we hope to aid land management and preservation efforts to sustain marsh ecosystems in the area."

The study, done in cooperation with the National Park Service, identified more than 40 potential barriers that, in addition to rugged topography, would further restrict inland migration of some marshes. The barriers are mostly roads that limit water and sediment movement. This study is intended to help managers proactively plan for mitigation of those barriers.

Salt marshes provide significant ecological value and aesthetic beauty to Maine's coasts. Their ecological functions include nursery and breeding habitat for many fish, shellfish, and wildlife species; storm, flood, and erosion protection; organic-matter production that feeds many commercially and recreationally valuable species; and filtration for sediments and contaminants.

The study area included all coastal areas in Maine from the eastern half of Penobscot Bay to the eastern edge of the Schoodic Peninsula. The 114 saltwater marshes included in the study range in size from larger than half an acre, up to 128 acres.

The analysis was based on high-resolution elevation data collected for coastal New England in 2010 with American Recovery and Reinvestment Act stimulus funding. The data were independently assessed for accuracy, and the maps show the expected inundation around each marsh to a 95 percent confidence interval. The manmade barriers to migration identified in the study are also shown.

Citizen Cooperation Requested in Lake Erie Yellow Perch Tagging Effort

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 29 Apr 2013 13:00:00 EDT

All Hands on Deck

Reporters: Do you want to accompany field crews as they tag yellow perch on Lake Erie during the week of April 29^th? Please contact Holly Muir at 734-214-9318 or hmuir@usgs.gov.

Sandusky, Ohio – With help from local anglers and fishermen, the U.S. Geological Survey and Ohio Department of Natural Resources will kick-start a five-year collaborative fish-tagging effort this week to better understand movement of yellow perch across Lake Erie.

Biologists are tagging adult yellow perch with tiny devices called Passive Integrated Transponders, or PIT tags, to track fish migration, and are asking for assistance from anglers and commercial fishermen to make fish available for scanning. Throughout the spring, summer, and fall fishing seasons, the USGS and ODNR biologists will frequent recreational access points, such as boat ramps and fish-cleaning stations, in order to interview anglers and scan fish. Commercial fishermen will be contacted based on the real-time information they provide to the ODNR catch reporting system.

"We are excited to be working with the ODNR to enhance scientific information on fish movement patterns," said Dr. Richard Kraus, chief of the USGS Lake Erie Biological Station. "Our Canadian partners in the Ontario Ministry of Natural Resources are also tagging yellow perch with PIT tags, so there will be mutual benefits for both countries with the potential to detect north-south movements."

PIT tags are a miniaturized version of the electronic toll-collection technology used on turnpikes. Each tag is about the size of a grain of rice and is uniquely coded per specific fish. It is placed in an inedible portion of the fish, so it does not affect the ability of the fish to be eaten. The scanning process only takes several seconds per cooler or 100-pound fish box, which hold 300-400 fish each. The angler interviews, or creel surveys, are critical to collecting data because it is impossible to tell if a fish is tagged without scanning it.

Tagging will occur from the ODNR’s 43-foot Research Vessel Grandon with other small agency vessels assisting the Grandon during the effort.

"The ODNR is pleased to be pursuing this collaborative research project with USGS, the Lake Erie Committee agencies, and stakeholder groups," said Jeff Tyson, ODNR, administrator for the Division of Wildlife Lake Erie Program. "Movement patterns of yellow perch have been identified as an information gap by resource management agencies and stakeholder groups, and this research will help the Lake Erie Committee agencies responsibly manage the valuable Lake Erie yellow perch resources."

This work is funded through the Federal Aid in Sport Fish Restoration Act and administered through the ODNR, Division of Wildlife. The Sport Fish Restoration Program was created to restore and better manage fishery resources with funds originating from excise taxes on fishing equipment, motorboat, and small engine fuels.

Sea Turtles Benefiting From Protected Areas

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 29 Apr 2013 11:00:00 EDT

Study Offers First Look at Green Sea Turtle Habitat Use in the Dry Tortugas

Additional Contact: Kristen Hart, Mobile Phone: 954-650-0336

DRY TORTUGAS, Fla. – Nesting green sea turtles are benefiting from marine protected areas by using habitats found within their boundaries, according to a U.S. Geological Survey study that is the first to track the federally protected turtles in Dry Tortugas National Park.

Green turtles are listed as endangered in Florida and threatened throughout the rest of their range, and the habits of green sea turtles after their forays to nest on beaches in the Southeast U.S. have long remained a mystery. Until now, it was not clear whether the turtles made use of existing protected areas, and few details were available as to whether they were suited for supporting the green sea turtle’s survival.

U.S. Geological Survey researchers confirmed the turtles' use of the protected areas by tracking nesting turtles with satellite tags and analyzing their movement patterns after they left beaches.

"Our goal was to better understand what types of habitats they used at sea and whether they were in fact putting these designated areas to use. This study not only shows managers that these designated protected areas are already being used by turtles, but provides insight into the types of habitats they use most," said the study’s lead author, Kristen Hart, who works as a research ecologist for the U.S. Geological Survey.

Hart's team made the discovery by fitting green sea turtle mothers with satellite tags after they came onto beaches within Dry Tortugas National Park to nest. After tracking their movements and analyzing their time at sea, the team located the areas turtles used between their nesting events and determined where turtles traveled after the nesting season was over.

They found green sea turtles spending much of their time in protected sites within both Dry Tortugas National Park and the surrounding areas of the Florida Keys Marine National Sanctuary.

"We were thrilled to find that these turtles used some areas already under 'protected' status. The ultimate goal is to help managers understand where these endangered turtles are spending their time both during the breeding period and then when they are at feeding areas. Given that worldwide declines in seagrasses – one of the most important habitats they rely on for food – has already been documented, this type of data is critical for managers," said Hart.

The team learned about the turtle's habitat needs during the nesting season by using ATRIS, a georeferenced, underwater camera system developed by the USGS to collect over 195,000 seafloor images. Researchers surveyed the areas frequented by turtles within Dry Tortugas National Park by photographing the seafloor in a series of parallel lines totaling 70 kilometers (over 43 miles). Using a habitat map derived from those images, they found that the turtles most commonly used shallow seagrass beds and degraded coral reefs that have been overgrown by a mixed assemblage of other organisms, such as sea fans, sponges, and fire coral.

"Our synergistic approach of combining satellite telemetry data with an extensive habitat map proved to be an effective way to find out exactly what habitats these nesting turtles were using in the Park," said Dave Zawada, a USGS research oceanographer and co-author on the study.

The Dry Tortugas' population made shorter migrations than that typically seen among other green turtle populations around the world; this was only the second published study showing green turtles taking up residence at feeding grounds located quite near their breeding grounds.

"We hope to keep pushing the frontier of what is known about in-water sea turtle habitat use, as this type of scientific information is vital for understanding whether conservation measures are effective," said Hart.

The study, "Habitat use of breeding green turtles Chelonia mydas tagged in Dry Tortugas National Park: Making use of local and regional MPAs," was published this week in the journal Biological Conservation.

About Green Sea Turtles

Although their young feed on jellyfish and other invertebrates, adult green sea turtles feed on seagrasses and algae, making them the only herbivorous (vegetarian) species of sea turtle. In fact, their name comes from their greenish colored fat, which is thought to be caused by their diet.

Green sea turtles are found around the world in three main types of habitat: nesting beaches, open ocean, and shallow water such as lagoons and shoals where they feed on marine grasses and algae found on the seafloor (‘benthic’ habitat). Within the U.S., green sea turtles are found from North Carolina to Florida, Hawaii, and the Virgin Islands and Puerto Rico. Their breeding populations in Florida are listed as endangered, but all other populations are listed as threatened.

The nesting season for green turtles lasts throughout the summer, but is most concentrated in June and July. During nesting season, females nest at roughly two-week intervals, producing an average of five nests or "clutches." Each clutch contains an average of 135 eggs, which will hatch after incubating for about 2 months.

Undeveloped Sagebrush Habitat Important for Maintaining Sage-grouse

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 22 Apr 2013 12:00:00 EDT

BOISE, Idaho— Among the diverse array of western habitats available to them, greater sage-grouse require sagebrush-dominated landscapes with extremely minimal levels of human land use according to USGS researchers who detailed the scientific results in a recently published report about the ecological conditions needed by this large, ground-dwelling bird.

The science, published in the journal Ecology and Evolution, was done to describe and accurately map the basic combination of factors necessary to support sage-grouse across large expanses of its range. Scientists compiled and analyzed information about the environment surrounding 3,000 active breeding areas, known as leks, within a 355,000 square–mile portion of the sage-grouse’s historic range. Environmental factors examined within a 3-mile radius of each lek were climate, land cover, and densities of roads, power lines, pipelines, and communication towers.

Ninety-nine percent of active leks were in landscapes with less than 3 percent of a developed category of land cover, and all lands surrounding leks were less than 14 percent developed. Further, most leks were in regions characterized by broad expanses of sagebrush and containing less than 25 percent agricultural activity. The location of leks relative to some specific types of infrastructure also was documented. For example, the average number of communication towers per square mile was 0.2 for the study area as a whole, 0.04 for active leks, but 7.1 for locations where sage-grouse occurred historically but not presently.

"We knew, from previously published science, that human activity affected sage-grouse, but our results in this new research showed that most leks were even absent from areas that had very low levels of human activity," said Steve Knick, a USGS scientist and the lead author of the report.

The importance of sagebrush as habitat for sage-grouse also was affirmed by this study. The vast majority of leks occurred where at least 40 percent of the surrounding landscape was dominated by sagebrush. Furthermore, almost all leks were in areas containing few conifer trees or few grassland expanses. These results are consistent with other evidence that sage-grouse are vulnerable to decreases in sagebrush due to the spread of invasive grasses in some areas and due to the encroachment of junipers and other conifer trees in other areas.

Leks also occurred in drier-than-average regions within a small temperature and precipitation range, suggesting that predicted changes in climate may cause lek locations to change depending on where there are optimal arid conditions.

Ecological connections among sage-grouse populations across the large study area also were described because species with multiple interconnected populations are more likely to persist than those with isolated populations. Large populations within the interior of the sage-grouse range were highly interconnected. In contrast, smaller populations along the range periphery often were connected to only one or two neighboring populations. Habitat changes in the connecting corridors that limit or disrupt sage-grouse movement could further isolate these peripheral populations, putting them at increased risk of loss.

Greater sage-grouse currently occupy approximately half of their historic range across western North America. They are a candidate for listing under the Endangered Species Act because of habitat and population fragmentation coupled with inadequate regulatory mechanism to control development in critical areas. Most of the sagebrush habitat used by sage-grouse is under public land management, with 50 percent managed by the U.S. Bureau of Land Management.

The publication is Knick, S.T., S.E. Hanser, and K.L. Preston. 2013. Modeling ecological minimum requirements for distribution of greater sage-grouse leks: implications for population connectivity across their western range, U.S.A. Ecology and Evolution.

App-lifying USGS Earth Science Data Challenge Winners Announced

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 22 Apr 2013 12:00:00 EDT

Species range and distribution, taxonomic classification, and conservation status applications top the list of submitted Apps

Just in time for Earth Day, the U.S. Geological Survey is pleased to announce the winners of the "App-lifying USGS Earth Science Data" Challenge. The USGS invited developers, information scientists, biologists/ecologists, and scientific data visualization specialists to create applications for selected USGS datasets, presenting them in innovative and informative new ways.

The winner for Best Overall App is "TaxaViewer" by the rOpenSci group based out of California. TaxaViewer is a Web interface to a mashup of data from the USGS-sponsored Integrated Taxonomic Information System (ITIS), the Phylotastic taxonomic Name service, the Global Invasive Species Database, Phylomatic, and the Global Biodiversity Information Facility. TaxaViewer allows the user to view species-specific taxonomic data, invasive status, phylogenetic relationships, and species occurrence records.

The Popular Choice App award goes to the "Species Comparison Tool" by Kimberly Sparks of Raleigh, N.C., which allows users to explore the USGS Gap Analysis Program distribution and/or range of two species concurrently. In addition, the application's "swipe tool" provides the ability to make visual comparisons of the maps. The application also incorporates ITIS data and provides external links to NatureServe species information.

"These applications provide us and, more importantly, the public with easy-to-use tools for accessing and viewing taxonomic and biogeographic data," said Kevin Gallagher, USGS Associate Director of Core Science Systems. "The innovative and thoughtful ideas represented in these applications are great examples of how complex data can be made more accessible."

The Challenge was open for submissions from January 9, 2013, to April 1, 2013. Entries spanned a cross-section of topics including taxonomic classification, conservation status of species, the range and distribution of animals, and one innovative app integrating social media with species occurrence records.

"We were extremely impressed with the caliber of applications we received for this Challenge," said Cheryl Morris, Director of USGS Core Science Analytics and Synthesis (CSAS). "The hard work and innovation that went into these applications is evident in their popularity, usability, and goal of making USGS data more readily accessible to all users."

Winners were selected based on relevance to the USGS and CSAS missions, innovation in design, and overall ease of use of the application. Utilizing the Challege.gov platform, the general public chose the winner of the Popular Choice App award.

More information about the winning applications can be found at the CSAS Challenge site. All of the submissions can be accessed on the App-lifying USGS Earth Science Data Challenge site.

Learn more about USGS Core Science Analytics and Synthesis programs and activities.

Discovering Species - Just a Click Away

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 18 Apr 2013 8:00:00 EDT

The USGS makes finding the locations (and more) of U.S. species a lot easier with the new digital resource - BISON

Biodiversity Information Serving Our Nation or BISON is the only system of its kind; a unique, web-based Federal resource for finding species in the U. S. and territories. Its size is unprecedented, offering more than 100 million mapped records of nearly every living species nationwide and growing. And the vast majority of the records are specific locations, not just county or state records.

What’s more, BISON provides an "Area of Interest" search capability in which users can query by drawing the exact boundary around their area of interest, down to and including towns, villages, or even much smaller areas such as parks. For instance, New York City's Central Park has more than 100,000 "species occurrences" recorded in BISON, with each species noted in detail. Other BISON search options include querying the species by scientific or common name, year range, state, county, basis of record, or provider institution.

As for the results, BISON displays them in both an interactive map and a list format. Users can click on each species occurrence point to retrieve more information, such as the institution providing the data, the collector, the date collected, and whether it was from a collection or an observation. Further, occurrences can be dynamically visualized with more than 50 other layers of environmental information in the system. Extensive web services are also available for direct connections to other systems.

"The USGS is proud to announce this monumental resource", said Kevin Gallagher, Associate Director, Core Science Systems," and this is a testament to the power of combining the efforts of hundreds of thousands of professional and citizen scientists into a resource that uses Big Data and Open Data principles to deliver biodiversity information for sustaining the Nation's environmental capital".

"BISON is destined to become an indispensable toolkit to manage species occurrence data to support scientific, educational, and policy-making activities in the US", Dr. Erick Mata, Executive Director of the Encyclopedia of Life explained. "This is highly complementary and synergistic with EOL's efforts to raise awareness and understanding of living nature."

"With BISON, the USGS takes a big step toward making biodiversity data held within Federal agencies easier to find and use", added Mary Klein, President & CEO of NatureServe. "I am enthusiastic about future opportunities to work with USGS to increase collaboration among Federal, state and private data holders."

USGS Core Science Systems Mission Area, which developed the resource, expects that BISON users will be broad-based and include land managers, researchers, refuge managers, citizen scientists, agriculture professionals, fisheries managers, water resource managers, educators, and more.

Land managers, for instance, might be looking for a piece of land to purchase for conservation—but first they want to know what species have been documented for that parcel. BISON will tell them after only a few mouse clicks.

BISON serves as the U.S. Node of the Global Biodiversity Information Facility (GBIF) and will form an integral part of EcoINFORMA, the information delivery strategy in "Sustaining Environmental Capital: Protecting Society and the Economy," a recent report by the President's Council of Advisors on Science and Technology (PCAST).

"BISON responds directly to a key need PCAST pointed out in 'Sustaining Environmental Capital' - to make Federal environmental data available, inter-operable, and usable to the public," said PCAST member Rosina Bierbaum, "We look forward to this 'biodiversity' hub being supplemented by complementary ecological data hubs by other Federal partners, to further the goal of helping communities across the Nation make increasingly wise planning and management decisions."

BISON already includes millions of points from the Federal investment in biodiversity research. It is formally cooperating with other Federal agencies to greatly expand the delivery of federally funded biodiversity data for the greatest possible good. Hundreds of thousands of citizen and professional scientists have collected the data in BISON. Non-governmental organizations, state and local governments, universities, and many others are also participating in this enormous undertaking.

The USGS has built and maintains BISON, which is hosted on the massive Federal computing infrastructure at Oak Ridge National Laboratory.

To learn more, visit: http://bison.usgs.ornl.gov or contact the USGS BISON Team at BISON@usgs.gov.

The USGS Core Science Analytics and Synthesis program within Core Science Systems is home to BISON and focuses on innovative ways to manage and deliver scientific data and information. The program implements and promotes standards and best practices to enable efficient, data-driven science for decision-making that supports a rapid response to emerging natural resource issues. One of the ways this is accomplished is by developing national data products that increase our understanding of the Earth’s natural systems.

New Map Sharpens View of African Ecosystems

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 11 Apr 2013 12:49:00 EDT

A team of African and North American scientists led by the U.S. Geological Survey and NatureServe, a conservation non-profit organization, has created a series of continent-wide ecosystem maps that offer the most detailed portrayals of Africa's natural setting yet produced. The new maps and related data on landforms, geology, bioclimates, and vegetation can be used across Africa for conservation planning and resource management, as well as for impact assessments of climate change and changes in land use, such as agriculture, deforestation, and urbanization.

"This was a multi-organizational, international collaboration to create new earth science datasets for the entire continent at finer resolutions than ever before," said Matt Larsen, USGS Associate Director for Climate and Land Use Change. "An added benefit is that this information about ecosystem conditions can be put to many different uses. It will have tremendous utility beyond ecosystem assessments."

USGS and NatureServe researchers collaborated with the Regional Centre for Mapping of Resources for Development (RCMRD), based in Nairobi, Kenya. RCMRD hosted two workshops where invited experts from many African nations developed a new classification of African ecosystems and provided location data for the newly classified ecosystems.

Overall, a total of 37 experts from 18 countries worked together to formulate the ecosystem classifications (126 distinct ecosystems were mapped) and produce the maps at a base resolution of 90 meters.

"This much improved baseline of Africa's ecosystem conditions has the potential for more accurate carbon assessment studies in Africa," observed USGS scientist Roger Sayre, lead author of the publication.

Determination of biological carbon stocks in ecosystems is an emerging science. Currently, carbon stocks are assessed in general biome categories like forests, grasses, shrublands, wetlands, deserts, and agricultural lands. The increased classification resolution supplied by the new African ecosystems maps will facilitate a more robust assignment of carbon inventories to a greater, more precise number of biological sources.

The Association of American Geographers (AAG) provided key support for the final publication. The publication is available in digital form from the USGS.

Citation

A new map of standardized terrestrial ecosystems of Africa

2013, Sayre, Roger; Comer, Patrick; Hak, Jon; Josse, Carmen; Bow, Jacquie; et al.

African Geographical Review

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New Sea-Level-Rise Modeling Forecasts Major Climate Impact to Low-Lying Pacific Islands

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 11 Apr 2013 12:00:00 EDT

SANTA CRUZ, Calif. — Dynamic modeling of sea-level rise, which takes storm wind and wave action into account, paints a much graver picture for some low-lying Pacific islands under climate-change scenarios than the passive computer modeling used in earlier research, according to a new U.S. Geological Survey report.

A team led by research oceanographer Curt Storlazzi of the USGS Pacific Coastal and Marine Science Center compared passive "bathtub" inundation models with dynamic models for two of the Northwestern Hawaiian Islands in the Papahānaumokuākea Marine National Monument. The team studied Midway, a classic atoll with islands on the shallow (2–8 meters or 6–26 feet deep) atoll rim and a deep, central lagoon, and Laysan, which is higher, with a 20–30 meter (65–98 feet) deep rim and an island in the center of the atoll. Together, the two locations exhibit landforms and coastal features common to many Pacific islands. Managed by the U.S. Fish and Wildlife Service, they are also among the world’s most important nesting and breeding sites for migratory birds and other wildlife.

"Passive 'bathtub' inundation models typically used to forecast sea-level rise impacts suggest that most of the low-lying atolls in the Pacific Islands will still be above sea level for the next 50-150 years. By taking wave-driven processes into account, we forecast that many of the atolls will be inundated, contaminating freshwater supplies and thus making the islands uninhabitable, much sooner," Storlazzi said.

The team found that at least twice as much land is forecast to be inundated on Midway and Laysan by sea-level rise than was projected by passive models. For example, 91 percent of Midway's Eastern Island is projected to be inundated under a model that takes into account storm and wave activity accompanied by a sea-level rise of 2 meters (6.5 feet), as compared with only 19 percent under passive sea-level-rise models. Storm waves on Midway are also projected to be three to four times higher than they are today, because more deep-water wave energy could propagate over the atoll rim and larger wind-driven waves could develop on the atoll.

"This report demonstrates the future threat to refuges with the Monument, and the potential impact on nesting seabirds, endangered monk seals and green sea turtles will be considered as we plan for the future," said Doug Staller, the Service's Superintendent of the Papahānaumokuākea Marine National Monument.

These findings have importance not only for island wildlife on the largely uninhabited Northwestern Hawaiian Islands, Storlazzi said, but for the tens of thousands of people who live on other low-lying Pacific Island groups such as those found in the Republic of the Marshall Islands and the Federated States of Micronesia. Because the models attempt to characterize how much land will be washed over by storm waves even if it is not permanently inundated, they offer tools for forecasting where agricultural land may be damaged by repeated saltwater overwash, as well as where groundwater may be contaminated by saltwater. The findings suggest that inundation and impacts to infrastructure and terrestrial habitats will occur at lower values of predicted sea-level rise, and thus sooner in the 21st century, than suggested by passive map-based "bathtub" inundation models.

The report, "Forecasting the Impact of Storm Waves and Sea-Level Rise on Midway Atoll and Laysan Island within the Papahānaumokuākea Marine National Monument—A Comparison of Passive Versus Dynamic Inundation Models," is available online.

USGS to Receive New Great Lakes Research Vessel

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 11 Apr 2013 10:00:00 EDT

Ann Arbor, Mich. – The U.S. Geological Survey awarded a contract last Friday for the construction of a large research vessel for Lakes Huron, Michigan, and Superior to Burger Boat Company of Manitowoc, Wis.

The vessel will replace the 38-year-old Grayling, bringing the USGS Great Lakes Science Center (GLSC) large vessel fleet up-to-date. The new Grayling will be stationed at the USGS base in Cheboygan, Mich., and will incorporate modern marine standards and state-of-the-art technology to more safely and effectively conduct fisheries research.

"I am delighted to have achieved this important milestone that will benefit the Great Lakes region for many decades," said USGS GLSC Director Russell Strach. "This investment would not have been possible without the support from many key partners. The new research vessel will come fully equipped with 21^st century laboratories and scientific instrumentation to support fishery science for the Great Lakes."

The funding for this expenditure was accrued from two prior appropriations and held in an account that was not affected by the sequester.

The replacement vessel is expected to be a commercial grade 78-foot vessel, and will be designed and constructed for a 40 to 50-year service life. This vessel will be capable of performing critical scientific and mission-related tasks, including dragging nets along the lake bottom, catching fish, and using sound-waves to detect fish and assess their abundance.

"The entire Burger team is very excited to be awarded this significant contract," said Jim Ruffolo, President and CEO of Burger Boat Company. "The Grayling will further reinforce Burger’s commitment to designing and constructing quality vessels that meet each owner’s specific requirements, whether they are custom yachts or commercial vessels."

This new contract will create additional highly skilled shipbuilding jobs at the Manitowoc shipyard, and the project will help support numerous companies that supply raw materials and equipment for the project.

For over 50 years the USGS GLSC has operated a unique and valuable deepwater fish ecology and assessment program that is the foundation for fisheries management throughout the Great Lakes.

Burger, at 150 years old, is one of the world's oldest shipyards. From its facility in Manitowoc, Wis., Burger's craftsmen have built hundreds of high quality vessels as long as 260 feet (80 meters) that can be found in ports around the world. Today, Burger continues its legacy of designing and building vessels to the highest standard from its fully updated shipyard.

JMS Naval Architects of Mystic, Conn., developed the preliminary design of the new Grayling.

The USGS GLSC maintains a fleet of fishery research vessels on each of the Great Lakes to meet the scientific research needs of state, tribal, and federal resource managers for understanding and effectively managing the Great Lakes fishery.

For more information on the USGS GLSC, visit their website.

Recovering Soil Fertility after Forest Fires

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 3 Apr 2013 14:00:00 EDT

CORVALLIS, Ore.— New scientific findings published in Ecology reveal that interactions of climate, soils, shrubs, and a natural nitrogen fertilization process affect regrowth of forests following wildfire in southern Oregon and northern California. Managers can use this information to consider post-fire management practices, including fertilization and shrub-removal.

Scientists studying forests that burned in 1987 discovered an interesting pattern in a natural fertilization process. The highest levels of natural nitrogen fertilization occurred at cool, dry sites where tree growth is slow and where nitrogen for growth is needed the least. In contrast, the lowest nitrogen additions occurred at warm, moist sites where tree growth and associated nitrogen needs are greatest.

This counterintuitive result occurred because natural nitrogen fertilization by nitrogen-fixing shrubs was suppressed by competition with oaks, maples, and other vegetation where tree growth was greatest, in warm, moist sites.

Nitrogen, an essential nutrient for tree growth, often is lost during a forest fire. An important way to recover forest fertility is an ecological process called biological nitrogen fixation. Some common shrubs, like Ceanothus, form unique relationships with bacteria and convert inert nitrogen gas from the air into forms of nitrogen in the soil that the trees can use for growth. Free-living soil bacteria also fix nitrogen. This natural process is the main source of nitrogen fertility in forests.

The scientists found that the rate at which Ceanothus shrubs added nitrogen to the system could be suppressed as tree biomass increased. Even though warm, wet sites stimulated the growth of nitrogen-fixing shrubs, these conditions stimulated the growth of other plants even more. Eventually, these changes limited the recovery of nitrogen fertility in the most productive sites.

According to Stephanie Yelenik, the lead author of the study, nitrogen additions by Ceanothus shrubs and by free-living soil bacteria provided an average of 7.5 pounds of nitrogen per acre per year. Over the 22 years following the major fire when the forest’s vegetation and nitrogen burned, this added up to about 165 pounds of nitrogen per acre. Although probably insufficient to fully replace wildfire nitrogen losses on the study sites, these contributions were substantial. Yelenik was affiliated with Oregon State University at the time of the study.

"There are important related results. Biological nitrogen fixation involving Ceanothus shrubs was up to 90 times greater than contributions from free-living soil microorganisms," said USGS scientist Steve Perakis, who participated in the study. "The contribution from Ceanothus would be even greater if other plants didn't compete so strongly. So ultimately competition among different plant species governed nitrogen input in the forests studied."

"The loss of nitrogen to wildfire has always been of concern to managers; however, the enormity of this loss only recently has been quantified," said Tom Sensenig, a U.S. Forest Service ecologist. "This study not only informs managers about the importance of shrubs for restoring nitrogen, but identifies the dynamics among species and the specific processes influencing nitrogen fixation and recovery across differing sites. Principally, this new information will help in developing post-fire management options and plans for specific forest types in this region. For example, on drier lower-quality sites, Ceanothus, the most prevalent nitrogen-fixing shrub identified, could be retained to the greatest extent possible by only treating the minimal vegetation necessary to assure seedling survival. On wetter, higher-productivity sites, treating more competitive species at a higher intensity may be more effective for maximizing nitrogen recovery, while benefiting seedling survival as well."

According to Yelenik, without additional fire or other forms of disturbance, Ceanothus largely disappears from productive sites in about 30 years as the tree canopy shades out the understory vegetation. Because Ceanothus is the major player in biological nitrogen fixation, from then on, nitrogen levels may remain consistently low in sites that have the necessary temperature and moisture conditions to promote rapid tree growth. On these sites, there may be opportunities to conduct vegetation management or to allow low-severity fires to burn as a way of encouraging the presence of nitrogen-fixing shrubs in the forest understory.

The study sites were located in forested mountains of the Klamath Region. This region is prone to wildfires, and the frequency and severity of the fires shape vegetation patterns. The study occurred 20 to 22 years after fire in sites that were salvage logged in the first 2 to 3 years after fire and then planted with conifer trees. Perakis believes the results are best applied to this region, but the interactions between climate, soils, shrubs, and natural nitrogen fertilization merit study elsewhere to see if similar constraints to nitrogen fixation occur in other forests recovering from fire.

The publication is Yelenik, S.G., S.S. Perakis, and D.E.Hibbs. 2013. Regional constraints to biological nitrogen fixation in post-fire forest communities. Ecology.

USGS Finds No Influence of Oil Platforms on Contaminant Levels in California Fishes

OC_Web@usgs.gov (Office of Communications and Publishing) — Tue, 2 Apr 2013 17:09:17 EDT

Fishes residing near oil platforms in southern California have similar contaminant levels as fishes in nearby natural sites, according to two recent reports by the U.S. Geological Survey, which were conducted to assist the Bureau of Ocean Energy Management (BOEM) in understanding potential consequences of offshore energy development.

Since the underwater portion of many offshore oil and gas platforms often provides habitat to a large number of fishes and invertebrates, some stakeholders have called for ocean managers to consider a "rigs-to-reefs" option during the decommissioning phase of a platform. This option would maintain some of the submerged structure to function as an artificial reef after oil and gas production has ended. The findings of this study address questions regarding how the industrial legacy of this kind of artificial reef may affect local fish populations.

Scientists analyzed the amount of contaminants from crude oil exposure present in three species of fish residing at oil platforms within the Santa Barbara Channel and the San Pedro Basin in California. The amount of contaminants present in fish tissue samples at seven platform sites was compared to samples at natural nearby sites. The brand new and recent USGS reports are available online.

"As part of this study, we developed methods capable of detecting the extremely low levels of contaminants that we anticipated in these ocean fishes, especially since they avoid natural oil seeps," said USGS scientist Robert Gale. "These results will assist decision-makers in helping to protect the environment off the coast of California."

Some of the most important contaminants related to oil operations are polycyclic aromatic hydrocarbons (PAHs). Several PAHs are probable human carcinogens and many are toxic to fish and other aquatic life. Scientists were able to develop a new, more accurate method of sampling small traces of PAHs that may have been ingested and broken down within the fish. Samples were taken from species thought to be most sensitive to PAH contamination. These species, including Pacific sanddab, kelp rockfish, and kelp bass, also tend to be targeted by fishermen. PAH concentrations were either very low or undetectable in all fish sampled for this study.

"These important results suggest two things," said BOEM marine biologist Donna Schroeder. "First, existing offshore oil platforms provide food and shelter to local fishes without increasing their background contaminant loads. Second, since there is no detectable PAH signal from ongoing operations, we would expect that if the State of California wanted to implement a rigs-to-reefs program, there would likely be no change, pollution-wise, in the quality of the offshore environment, which appears to be pretty good."

Scientists also looked at industrial chemicals in the Pacific sanddab species, including polychlorinated biphenyls (PCBs), flame retardants (polybrominated diphenylethers, PBDEs), and pesticides (OCPs). These contaminants were also found at low levels in all fish sampled, with no observed pattern between natural and platform habitats.

The Bureau of Ocean Energy Management promotes energy independence, environmental protection and economic development through responsible, science-based management of offshore conventional and renewable energy. While the agency is responsible for analyzing the potential environmental impacts of removing oil and gas platforms in federal waters, the Bureau of Safety and Environmental Enforcement approves applications for decommissioning and ensures that they are conducted safely and in compliance with federal regulations. For additional information on BOEM activities, visit http://www.boem.gov/.