USGS Newsroom

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.

Birds at Sea and Offshore Wind Energy

OC_Web@usgs.gov (Office of Communications and Publishing) — Tue, 4 Dec 2012 11:59:28 EDT

Topic of Free Lecture Wednesday

Reston, Va. – Offshore wind energy development and migratory birds is the topic of a free public lecture Wednesday, December 5, at 7 p.m. at the U.S. Geological Survey National Center in Reston, Va.

Titled, "Birds at Sea and Offshore Wind Energy," the lecture takes place in a federal facility and a valid photo ID is required for entry by attendees 18 years of age and older. Attendees should plan to arrive at least 15 to 20 minutes early to process through security.

For this lecture, USGS scientists Alicia Berlin and Allan O'Connell will discuss efforts to determine the potential effects of offshore wind energy development on more than 60 different sea-bird species along the Atlantic coast. USGS collaborative research on the migratory routes and patterns of sea birds is being used to help inform decisions on potential locations of wind farms in Atlantic waters.

For more information and directions visit the Public Lecture Series website.

Those unable to attend the lecture in person can follow it live on Twitter @USGSLive

These evening events are free to the public and intended to familiarize a general audience with science issues that are meaningful to their daily lives. USGS speakers are selected for their ability and enthusiasm to share their expertise with an audience that may be unfamiliar with the topic.

The series provides the public an opportunity to interact with USGS scientists and ask questions about recent developments in Natural Hazards; Water; Energy Minerals and Environmental Health; Climate and Land Use Change; Ecosystems; and Core Science Systems. Ultimately, the goal is to create a better understanding of the importance and value of USGS science in action.

Photos Reveal Severity of Hurricane Sandy's Coastal Impacts

OC_Web@usgs.gov (Office of Communications and Publishing) — Fri, 9 Nov 2012 15:20:00 EDT

ST. PETERSBURG, Fla. – The USGS has released a series of aerial photographs showing before-and-after images of Hurricane Sandy’s impacts on the Atlantic Coast.

The photos, part of a USGS assessment of coastal change from as far south as the Outer Banks of North Carolina to as far north as Massachusetts, show that the storm caused dramatic changes to portions of shoreline extending hundreds of miles. Pre- and post-storm images of the New Jersey and New York shoreline in particular tell a story of a coastal landscape that was considerably altered by the historic storm.

"Sandy taught us yet again that not all Cat-1 hurricanes are created equal: the superstorm's enormous fetch over the Atlantic produced storm surge and wave erosion of historic proportions," said USGS Director Marcia McNutt. "We have seized this opportunity to gather unique data on a major coastline-altering event."

As major storms approach, the USGS conducts pre-storm and post-storm flights to gather aerial images along the length of the coastline expected to experience impacts from the storm’s landfall. Identifying sites of such impacts helps scientists understand which areas are likely to undergo the most severe impacts from future storms, and improves future coastal impact forecasting.

Photo pairs from North Carolina to Massachusetts will be made available online as the coastal change assessment continues.

"This storm's impact on sandy beaches included significant beach and dune erosion and minor disruption of infrastructure in the south," said USGS oceanographer Nathaniel Plant, "to extreme and often catastrophic erosion, overwash and sediment deposition, and inundation on northern beaches like Mantoloking, New Jersey."

Overwash occurs when storm surge and waves exceed the elevation of protective sand dunes, thereby transporting sand inland. In addition to threatening infrastructure like roadways, it can bury portions of buildings and cause extensive property damage. Since beaches and dunes serve as a first line of defense against extreme storms, this could further compromise the safety of coastal populations.

Data collected from these surveys are also used to improve predictive models of potential impacts from future severe storms. Before a storm makes landfall, USGS makes these predictions to help coastal communities identify areas particularly vulnerable to severe coastal change, such as beach and dune erosion, overwash, and inundation.

For instance, in the days before Sandy approached the eastern seaboard, the USGS ran models forecasting that 91 percent of the Delmarva coastline would experience beach and dune erosion, while 98 percent and 93 percent of beaches and dunes in New Jersey and New York, respectively, were likely to erode. Preliminary analysis suggests that Hurricane Sandy rapidly displaced massive quantities of sand in a capacity that visibly changed the landscape.

The USGS worked closely with the National Park Service to gather field data on pre- and post- storm conditions at Fire Island National Seashore on Long Island. The field team went to Fire Island in advance of the storm to capture the morphology of the beach and dunes. The team re-surveyed the beach to capture its state immediately after the storm, and they found drastic changes.

"We found that there was widespread dune erosion and overwash," said St. Petersburg-based USGS coastal geologist Cheryl Hapke. "On average the dunes eroded back 70 feet - the equivalent of 30-years of change, which had previously been measured. Our data also showed that dunes lost as much as 10 feet of elevation."

This rapid response data was used to help the National Park Service assess the areas of the coast that were most vulnerable to a nor'easter that impacted the coast a week after Sandy.

The USGS is also processing pre- and post-landfall airborne lidar data to gather information on the extent of coastal change caused by Sandy. Lidar, or light detection and ranging, is an aircraft-based remote sensing method that uses laser pulses to collect highly detailed ground elevation data.

Study Confirms Presence of Contaminants in Some New England Bedrock Groundwater, ID's New Concerns, Determines Likely Locations

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 25 Jun 2012 18:26:36 EDT

The report is posted online. The project website includes selected maps and more information.

PEMBROKE, N.H. -- Potentially harmful levels of naturally occurring arsenic, uranium, radium, radon and manganese have been found in some bedrock groundwater that supplies drinking water wells in New England, according to a new U.S. Geological Survey study.

While the presence of contaminants, such as arsenic, in some groundwater was already known, this new study identifies several that hadn’t been previously identified. This new report also provides information on the type of bedrock geologic formations where high concentrations are most likely to be found, which will help identify areas most at risk of contamination.

The results highlight the importance of private well owners testing and potentially treating their water. While public water supplies are treated to ensure that water reaching the tap of households meets federal requirements, there are no such requirements for private supplies, which serve more than 2.3 million people in the region. Private well owners can find information on how to have their wells tested here. All of the contaminants identified can be reduced or eliminated through a variety of treatments.

"The same geologic forces which gave rise to the spectacular mountains and architecturally significant rock quarries of New England are also responsible, over time, for leaching trace contaminants into the groundwater that can be harmful to human health," said USGS Director Marcia McNutt. "This study helps focus attention on where and what the risk factors are such that citizens who depend on private wells can get their water tested to ensure peace of mind."

Among the findings, arsenic in untreated samples exceeded federal safety standards for public drinking water at 13 percent of sites – nearly double the national rate. Manganese exceeded its human-health benchmark in more than 7 percent of wells tested. Radon exceeded the U.S. Environmental Protection Agency’s proposed standards in 33 percent of wells. Additionally, uranium, which is easily measurable, was found to be a significant predictor of the presence of other forms of radioactivity (radon, radium, gross alpha radioactivity) that are a cause of concern for human health.

The study, part of an ongoing national effort by the USGS to systematically assess the quality of the Nation’s most important aquifers, is the most comprehensive study of the quality of New England’s bedrock groundwater to date.

“The concentrations above human health benchmarks and the wide variety of natural and man-made contaminants found show the vulnerability of crystalline rock aquifers that millions of people rely on to produce safe drinking water,” said USGS scientist and lead author Sarah Flanagan. “The well-to-well variability of water quality from bedrock aquifers in the region underscores the importance of testing public and private wells individually.”

"The bedrock aquifer in New England is a crucial drinking water resource, supplying water for the majority of our 2.3 million private well owners and many small public water systems in the region," said Curt Spalding, regional administrator of the U.S. Environmental Protection Agency's New England office. "This and other scientific studies on bedrock groundwater quality conducted by the USGS provide the scientific foundation for implementing protection programs to ensure that all New Englanders have access to safe, clean drinking water."

For this study, scientists examined water-quality data from more than 4,700 public-supply wells that were sampled for the USEPA Safe Drinking Water Program from 1997 to 2007 and 117 private wells sampled by the USGS National Water-Quality Assessment Program from 1995 to 2007. The samples included only well water from crystalline rock aquifers found in most of New England and small portions of northern New Jersey and southern New York State.

Depending on concentrations and the period of time someone consumes the water, among the potential health issues associated with drinking water containing these contaminants at levels above human health benchmarks include various types of cancer; reproductive and developmental problems; kidney and blood diseases; diabetes; and a weakened immune system.

“This study confirmed many areas already known to have groundwater with high levels of arsenic and radiochemicals and revealed for the first time, the potential fluoride hotspots in parts of the White Mountain region of northern New Hampshire,” said Flanagan.

These hotspots are locations with naturally occurring fluoride that can exceed drinking water standards.

“We also found that high concentrations of many naturally occurring compounds in groundwater were related to specific bedrock formations,” added Flanagan.

In addition to natural sources, human activities affected the quality of groundwater from New England’s crystalline rock aquifers. The researchers found sodium and chloride in water sources, both naturally occurring as well as that from road salt; nitrates; MtBE (methyl tert-butyl ether) and chloroform; and, rarely, pesticides. The concentrations of these contaminants were all below levels of human health concern, but some, such as chloride, had the potential to impact aquatic organisms.

The complete results of the study, Quality of Water from Crystalline Rock Aquifers in New England, New Jersey, and New York, 1995-2007, by Sarah M. Flanagan, Joseph D. Ayotte, and Gilpin R. Robinson, Jr., are available online.

Private well owners in New England can contact their State Drinking Water Programs for guidance and information about well maintenance, testing, and in-home water treatment options.

Information about water quality nationwide is found on the USGS National Water-Quality Assessment Program website.

Information about the USEPA’s New England Drinking Water Program can be found online.

Access the USGS New Hampshire Water Science Center for more information about water in New England.

Low April Streamflows Not Necessarily an Indicator of Summer Drought

OC_Web@usgs.gov (Office of Communications and Publishing) — Mon, 21 May 2012 14:00:00 EDT

The low streamflows seen throughout much of New England this April do not foreshadow a summer drought, as researchers have determined summer rainfall plays a bigger role than snowmelt runoff in determining streamflows in the summer.

In a new report by the U.S. Geological Survey, scientists also looked at how streamflow during April is influenced by both winter air temperature and precipitation. They concluded that April streamflow is more sensitive to changes in temperature than to changes in winter precipitation in southern New England.

While streamflow in April is more sensitive to changes in temperature, summer streamflows are more dependent on precipitation.

Understanding the sensitivity of streamflow to climatic variation is important because people and aquatic ecosystems are dependent upon water supplies, particularly in summer low-flow seasons.

"This valuable scientific investigation demonstrates the ability of USGS researchers to rapidly respond to a sudden and troubling anomaly, in this case southern New England streamflows lower than 90 percent of historical April flows, and by May we were able to produce a useful report getting to the heart of the issue," said USGS Director Marcia McNutt. "Their work uncovers new feedbacks relevant to climate change impacts on stream flows while demonstrating the return-on-investment from our long-term streamgaging program."

"In this study, we found that warm March air temperatures this year in southern New England contributed to low April streamflows," said USGS scientist Glenn Hodgkins, who is the lead author of this report. "It is well known that precipitation affects streamflows, but it has been less well known that air temperature can affect flows too."

Warmer air temperatures cause snowpack to melt earlier, with most runoff then occurring prior to April in southern New England. Winter precipitation is still a contributing influence, as lower precipitation results in lower snowpack accumulation and less water available for spring runoff.

"With warmer winters predicted in the future, spring streamflows in New England could continue to change," said Robert Lent, USGS Maine Water Science Director. "This study helps us to understand that relationship and provides information to those who manage water resources."

The USGS has been collecting continuous streamflow data for 50 to 100 years at many rivers in New England. Scientists analyzed April flows from 31 streamgages in areas that are not strongly influenced by direct human watershed changes such as reservoir regulation or urbanization.

Using these data, they analyzed year-to-year correlations between April flows and winter precipitation and air temperature from nearby meteorological sites. They also looked at year-to-year correlations between April flows and late-spring and summer flows.

The study focused on the New England region, which includes Maine, New Hampshire, Vermont, Massachusetts, Rhode Island and Connecticut.

Read the USGS report, “Relations between Winter Climatic Variables and April Streamflows in New England and Implications for Summer Streamflows.”

The USGS has around 7,800 streamgages across the nation. Learn more by visiting the National Water Information System website.

USGS Details Effects of Climate Change on Water Availability in 14 Local Basins Nationwide

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 16 May 2012 6:00:00 EDT

Climate change projections indicate a steady increase in temperature progressing through the 21^st century, generally resulting in snowpack reductions, changes to the timing of snowmelt, altered streamflows, and reductions in soil moisture, all of which could affect water management, agriculture, recreation, hazard mitigation, and ecosystems across the nation. Despite some widespread similarities in climate change trends, climate change will affect specific water basins in the U.S. differently, based on the particular hydrologic and geologic conditions in that area.

New USGS modeling studies project changes in water availability due to climate change at the local level. So far, the USGS has applied these models to fourteen basins, including:

"The advantage of these studies is that they demonstrate that there is not just one hydrological response to climate change: the predictions account for essential local factors that will govern the timing, severity, and type of impact, whether it be water shortage, drought, or flood," said USGS Director Marcia McNutt. "This is exactly the sort of information communities need to know now, because we are unlikely to see a 'water-as-usual' future."

These local projections are based on General Circulation Models (GCM) that predict how climate change will affect temperature, precipitation, and emissions for large regional areas. The USGS’s Precipitation Runoff Modeling System (PRMS) applies information from the downscaled GCM projections to local watersheds, where impacts of climate change on water availability will depend on local conditions. These local-scale hydrologic projections will allow managers to plan for changes in water resources that are specific to their area.

For example, the USGS models project that changes to snow pack in the Sprague River Basin in Oregon could cause annual peak streamflows to occur earlier in the spring as overall basin storage decreases, which may force managers to modify storage operation and reprioritize water deliveries for environmental and human needs. Reduced snowpack in headwaters of the Colorado River could affect the amount and timing of streamflow to the Colorado River and also impact important recreation areas. Portions of Maine may see higher streamflows which could affect populations of endangered Atlantic salmon. Areas of the already drought-stressed Flint River Basin, one of Atlanta’s primary drinking water supplies, are projected to become even drier.

The results for each basin present a complex story due to uncertainty associated with the future climate projections and their effect on the hydrological response of the different geographical regions of the nation.

Detailed information about watershed responses to climate change can be found online. Additionally, a collection of USGS studies that contributed to these basin-wide analyses was published in the journal Earth Interactions.

The downscaled GCM models are obtained from the World Climate Research Programme's Coupled Model Intercomparison Project phase 3 multi-model dataset archive. The USGS PRMS models were developed as part of the USGS National Research Program (NRP) in cooperation with USGS Water Science Centers. The NRP develops new information, theories, and techniques to anticipate, understand, and solve problems facing resources managers and is a national leader in understanding the effects of climate change on water resources.

These USGS models are just one of several tools developed and used by agencies within the Department of the Interior to study potential impacts from climate change and to provide tools to resource managers to adapt to those changes. For example, the Bureau of Reclamation recently unveiled a user-friendly tool for calculating future streamflow and water supplies at 195 sites in the western United States to help increase accessibility of science-based information and ease understanding of how climate variations will impact water availability for local communities.

A Big Day for Science: Citizens Have Contributed One Million Observations to Top Nature Database

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 3 May 2012 9:00:00 EDT

RESTON, Va. — Thanks to citizen-scientists around the country, the USA National Phenology Network hit a major milestone this week by reaching its one millionth nature observation.

The millionth observation was done by Lucille Tower, a citizen-scientist in Portland, Ore., who entered a record about seeing maple vines flowering. Her data, like all of the entries, came in through USA-NPN’s online observation program, Nature's Notebook, which engages more than 4,000 volunteers across the country to observe and record phenology – the timing of the recurring life events of plants and animals such as when cherry trees or lilacs blossom, when robins build their nests, when salmon swim upstream to spawn or when leaves turn colors in the fall.

Each record not only represents a single data point — the status of a specific life stage of an individual plant or animal on one day – but also benefits both science and society by helping researchers understand how plants and animals are responding to climate change and, in turn, how those responses are affecting people and ecological systems.

"My dream is that through the wonders of modern technology and the National Phenology Network we could turn the more than six billion people on the planet into components of our scientific observing system," said USGS Director Marcia McNutt. "We could make giant leaps in science education, improve the spatial and temporal coverage of the planet, lower the cost of scientific data collection, and all while making ordinary citizens feel a part of the scientific process."

Jake Weltzin, a U.S. Geological Survey scientist and the executive director of USA-NPN, concurs. "Hitting the one millionth observation is exciting because researchers and decision-makers need more information to understand and respond to our rapidly changing planet. More information means better-informed decisions that ensure the continued vitality of our natural areas that we all depend on and enjoy."

For example, said Weltzin, the data in Nature's Notebook are already being used to benefit society, including the development of more accurate indicators of spring, forecasting the onset of allergy seasons or the chances of western wildfires, managing wildlife and invasive plants, and setting goals for habitat restoration. Ultimately, such information can be used for better managing water resources, wildlife and ecosystem management, and even help farmers and ranchers across the nation.

Changes in phenology are among the most sensitive biological indicators of global change. Across the world, many springtime events are occurring earlier — and fall events happening later — than in the past. These changes are happening quickly for some species and more slowly, or not at all, for others, altering relationships and processes that have been dynamically stable for thousands of years. Some wildlife —like caribou and butterflies — are becoming mismatched from their plant food resources, which are responding differently. Migrations for some birds are changing too, as they can now overwinter instead of moving south for the winter, or as they fly north more quickly to keep pace with an advancing front of spring flowering.

Because of this, said Weltzin, scientists need more and better information about the pace and pattern of nature — locally to nationally — to answer important scientific and societal questions, and to build the tools and models needed to help people understand and adapt to the changes.

"So much of our improved understanding about global environmental changes is driven by varied and valuable sources of information that include networks of citizen-scientists," said John Wingfield, National Science Foundation’s assistant director for biological sciences. "The public at large has played an important role collecting observations and data for a hundred years and more. Knowledge and data gained from their work will continue to have a lasting effect on how we understand regularly recurring biological phenomena for hundreds of plant and animal species and contribute to the policy arena."

Gwen Lundburg in Seattle is one citizen-scientist who has contributed hundreds of entries into Nature’s Notebook. "Just noticing small changes like tiny purple lilac buds suddenly turning green has taught me to look more closely at my plants," Lundburg said. "I see things in my garden I never saw before."

With the help of citizen-scientist volunteers, working in concert with professionals, the USA-NPN, which was established in 2007, collects, stores and freely shares phenological data on more than 800 species of plants and animals. The Nature’s Notebook observing program has been in operation since 2009. The coordinating office of the organization is located at 1955 E. 6^th St., Tucson, Ariz., 85721. For more information, visit the USA National Phenology Network, or contact Jake Weltzin at 520-626-3821 or jweltzin@usgs.gov.

USGS In the Surge Sampling for Nutrients, Sediment, E. coli, and Pesticides

OC_Web@usgs.gov (Office of Communications and Publishing) — Sun, 28 Aug 2011 14:39:09 EDT

Follow USGS on twitter @USGS to learn where the crews will be each day.
Media: If you would like to accompany a USGS crew during sampling, contact Kara Capelli at kcapelli@usgs.gov.

As Hurricane Irene has left her mark along the East Coast, USGS crews are sampling water for pesticides, E. coli, nutrients, and sediment to document water quality in areas affected by the hurricane. This sampling effort is part of the federal government’s broad efforts to ensure public health and to support the state, tribal, and local response to the storm.

Sampling is taking place along the East Coast. Crews will follow the path of the hurricane where it brought high flows.

“Significant high water events are important to document, because a storm event like this can flush large quantities of nutrients, pesticides, and bacteria into rivers and also alter sediment flow,” said Charles Crawford, coordinator of the sampling effort. “When looking at long-term water quality trends and year to year variation, this hurricane could be a defining event for 2011, and it’s important that USGS captures a complete picture of what happens this year.”

Excessive nutrients in the Nation’s rivers, streams and coastal areas are a major issue for water managers, because they cause algal blooms that increase costs to treat drinking water, limit recreational activities, and threaten valuable commercial and recreational fisheries. Increased sediment can cause costly changes in shipping channels, where new sediment can require additional dredging.

“The USGS creates models that relate nutrient, pesticide and sediment concentrations to how much water is flowing,” said Crawford.” In order to have the most accurate model, it’s important to document concentrations during a high flow event such as this one.”

Additionally, high flows from the hurricane have the potential to create higher concentrations of E. Coli in areas that use surface water for drinking.

Bats Worth Billions to Agriculture: Pest-control Services at Risk

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 31 Mar 2011 16:38:46 EDT

Additional Media Contacts:

Paul Cryan, USGS, 970-226-9389, cryanp@usgs.gov
Gary McCracken, University of Tennessee, 865-974-3065, gmccrack@utk.edu
Thomas Kunz, Boston University, 617-353-2474, kunz@bu.edu

Pest-control services provided by insect-eating bats in the United States likely save the U.S. agricultural industry at least $3 billion a year, and yet insectivorous bats are among the most overlooked economically important, non-domesticated animals in North America, according to an analysis published in this week’s Science magazine Policy Forum.

"People often ask why we should care about bats,” said Paul Cryan, a U.S. Geological Survey research scientist and one of the study’s authors. “This analysis suggests that bats are saving us big bucks by gobbling up insects that eat or damage our crops. It is obviously beneficial that insectivorous bats are patrolling the skies at night above our fields and forests — these bats deserve help."

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The value of the pest-control services to agriculture provided by bats in the U.S. alone range from a low of $3.7 billion to a high of $53 billion a year, estimated the study’s authors, scientists from the University of Pretoria (South Africa), USGS, University of Tennessee and Boston University. They also warned that noticeable economic losses to North American agriculture could occur in the next 4 to 5 years as a result of emerging threats to bat populations.

“Bats eat tremendous quantities of flying pest insects, so the loss of bats is likely to have long-term effects on agricultural and ecological systems,” said Justin Boyles, a researcher with the University of Pretoria and the lead author of the study. “Consequently, not only is the conservation of bats important for the well-being of ecosystems, but it is also in the best interest of national and international economies.”

A single little brown bat, which has a body no bigger than an adult’s thumb, can eat 4 to 8 grams (the weight of about a grape or two) of insects each night, the authors wrote. Although this may not sound like much, it adds up — the loss of the one million bats in the Northeast has probably resulted in between 660 and 1320 metric tons of insects no longer being eaten each year by bats in the region.

“Additionally, because the agricultural value of bats in the Northeast is small compared with other parts of the country, such losses could be even more substantial in the extensive agricultural regions in the Midwest and the Great Plains where wind-energy development is booming and the fungus responsible for white-nose syndrome was recently detected,” said Tom Kunz, a professor of ecology at Boston University, another co-author.

Although these estimates include the costs of pesticide applications that are not needed because of the pest-control services bats provide, Boyles and his colleagues said they did not account for the detrimental effects of pesticides on ecosystems nor the economic benefits of bats suppressing pest insects in forests, both of which may be considerable.

Bat populations are at risk in some areas of the country as a result of the emerging disease of white-nose syndrome. The loss of bats to white-nose syndrome has largely occurred during the past 4 years, after the disease first appeared in upstate New York. Since then, the fungus thought to cause white-nose syndrome has spread southward and westward and has now been found in 16 states and 3 Canadian provinces. Bat declines in the Northeast, the most severely affected region in the U.S. thus far, have exceeded 70 percent. Populations of at least one species, the little brown bat, have declined so precipitously that scientists expect the species to disappear from the region within the next 20 years.

Scientists are also concerned with the potential for losses of certain species of migratory bats at wind-energy facilities. By one estimate, published by Kunz and colleagues in 2007, about 33,000 to 111,000 bats will die each year by 2020 just in the mountainous region of the Mid-Atlantic Highlands from direct collisions with wind turbines as well as lung damage caused by pressure changes bats experience when flying near moving turbine blades. The issue raised by the authors is that the impacts on bat populations from white nose syndrome and wind turbines are just beginning to interact and might result in economic consequences.

“We hope that our analysis gets people thinking more about the value of bats and why their conservation is important,” said Gary McCracken, a University of Tennessee professor and co-author of the analysis. “The bottom line is that the natural pest-control services provided by bats save farmers a lot of money.”

The authors conclude that solutions to reduce threats to bat populations may be possible in the coming years, but that such work is most likely to be driven by public support that will require a wider awareness of the benefits of insectivorous bats.

The article, “Economic importance of bats in agriculture,” appears in the April 1 edition of Science. Authors are J.G. Boyles, P. Cryan, G. McCracken and T. Kunz.

68 Percent of New England and Mid-Atlantic Beaches Eroding

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 23 Feb 2011 8:00:00 EDT

WOODS HOLE, Mass. -- An assessment of coastal change over the past 150 years has found 68 percent of beaches in the New England and Mid-Atlantic region are eroding, according to a U.S. Geological Survey report released today.

Scientists studied more than 650 miles of the New England and Mid-Atlantic coasts and found the average rate of coastal change – taking into account beaches that are both eroding and prograding -- was negative 1.6 feet per year. Of those beaches eroding, the most extreme case exceeded 60 feet per year.

The past 25 to 30 years saw a small reduction in the percentage of beaches eroding – dropping to 60 percent, possibly as a result of beach restoration activities such as adding sand to beaches.

“This report provides invaluable objective data to help scientists and managers better understand natural changes to and human impacts on the New England and Mid-Atlantic coasts,” said Anne Castle, Assistant Secretary of the Interior for Water and Science. “The information gathered can inform decisions about future land use, transportation corridors, and restoration projects.”

Beaches change in response to a variety of factors, including changes in the amount of available sand, storms, sea-level rise and human activities. How much a beach is eroding or prograding in any given location is due to some combination of these factors, which vary from place to place.

The Mid-Atlantic coast – from Long Island, N.Y. to the Virginia-North Carolina border -- is eroding at higher average rates than the New England coast. The difference in the type of coastline, with sandy areas being more vulnerable to erosion than areas with a greater concentration of rocky coasts, was the primary factor.

The researchers found that, although coastal change is highly variable, the majority of the coast is eroding throughout both regions, indicating erosion hazards are widespread.

"There is increasing need for this kind of comprehensive assessment in all coastal environments to guide managed response to sea-level rise," said Dr. Cheryl Hapke of the USGS, lead author of the new report. "It is very difficult to predict what may happen in the future without a solid understanding of what has happened in the past.”

The researchers used historical data sources such as maps and aerial photographs, as well as modern data like lidar, or “light detection and ranging,” to measure shoreline change at more than 21,000 locations.

This analysis of past and present trends of shoreline movement is designed to allow for future repeatable analyses of shoreline movement, coastal erosion, and land loss. The results of the study provide a baseline for coastal change information that can be used to inform a wide variety of coastal management decisions, Hapke said.

The report, titled "National Assessment of Shoreline Change: Historical Shoreline Change along the New England and Mid-Atlantic Coasts," is the fifth report produced as part of the USGS’s National Assessment of Shoreline Change project. An accompanying report that provides the geographic information system (GIS) data used to conduct the coastal change analysis is being released simultaneously.

Water Well Tests Show More Towns with Elevated Arsenic in Maine

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 8 Dec 2010 9:00:00 EDT

The report “Assessment of Arsenic Concentrations in Domestic Well Water, by Town, in Maine, 2005–09” and maps are posted online.

Potentially harmful arsenic levels have been found in private water wells in towns across Maine where elevated arsenic risks were not previously suspected. Arsenic levels in some private wells exceeded the federal safety standard for public drinking water by ten to one-hundred times or more, according to findings released today by the U.S. Geological Survey. The study is the largest of its kind in Maine.

“We found large differences in concentrations from well to well, even at the town level, so residents need to test their wells to know their arsenic level,” said USGS scientist Martha Nielsen, who led the study in cooperation with the Maine Center for Disease Control and Prevention. “We are working with the Maine CDC to identify towns throughout the state where elevated arsenic levels are common but have gone mostly unnoticed.”

"The USGS has been working nationwide for many years to test groundwater for arsenic,” said Robert M. Lent, Director of the USGS Maine Water Science Center in Augusta. “Arsenic levels in this study are some of the highest we have seen in private wells,” said Lent. “Nearly half of Maine’s population use private wells for drinking water, so this issue quite literally hits home for many people.”

“It only takes one person in a town to be an advocate and champion to encourage fellow citizens to have their wells tested. The variability in arsenic concentrations, even at the town level, shows that testing is crucial for homeowners in assessing personal risk,” said Lent.

The Maine CDC is distributing posters and brochures to selected town offices based on the proportion of residents on private wells and information about the presence of wells with arsenic. The Maine CDC has worked in partnership with towns throughout Maine to prevent the spread of diseases.

“This mapping effort is helping us to better target our efforts to promote testing of private wells for arsenic,” said State Toxicologist Andrew Smith with the Maine CDC. “Statewide only about 40 percent of private water well owners have tested for arsenic, so it is crucial that we target our resources to the highest risk areas and nearby areas where we lack data,” said Smith.

For this study, scientists examined data from more than 11,000 wells in 530 cities, towns, and townships in Maine. Data came from water samples submitted to the Maine Health and Environmental Testing Laboratory between 2005 and 2009.

Arsenic levels ranged from less than the detection limit of 0.5 micrograms/liter (ug/L) to 3,100 ug/L. The federal safety standard for public drinking water is 10 ug/L.

Test results were summarized at the town level to produce maps showing arsenic concentrations by town where sufficient samples were collected. The maps provide a much greater spatial resolution of arsenic in private wells across the state than have previous efforts.

“This study confirmed many areas already known to have high levels of arsenic in groundwater and revealed for the first time, towns that should be further investigated,” said Nielsen. “Several towns in eastern Washington and central Penobscot counties, and in the southern parts of Piscataquis and Somerset counties have elevated arsenic that is more widespread than we realized.”

Even though the study included more than 11,000 wells, this is a relatively small sample of all the private wells in Maine.

“This study shows the difficulty of predicting arsenic concentrations at the local level and should signal to everyone with a private well that the only way to know about arsenic concentrations in their well is to have their water tested,” said Nielsen.

Most towns with more than 20 wells in the database had at least one well with arsenic levels greater than the safety standard. In a few towns, more than 50 percent of the sampled wells had arsenic levels greater than the safety standard. In considering these data, it is important to understand that the wells do not represent a random sample of the state. These data, however, provide a better indicator of potential arsenic hotspots than any other dataset.

"Geology is probably the biggest factor in the distribution of arsenic in private wells,” said Nielsen. “But the degree of local variability means that we can't simply use bedrock type to determine all the areas in the state where it is critical that people test their wells.”

Drinking water with arsenic above safety standards has been linked to an increased risk for skin, bladder, and lung cancer; to reproductive and developmental problems; diabetes; and effects on the immune system. Private water wells are not regulated under the federal Safe Drinking Water Act and well owners typically are responsible for testing the quality of their drinking water.

Elevated arsenic levels are not limited to Maine. A recent national USGS study found arsenic concentrations above the federal drinking water standard in more than 10 percent of private wells in New England’s bedrock aquifers compared to about 7 percent of private wells nationwide.

Private well owners can contact the Maine Drinking Water Program for guidance and information about well maintenance, testing, and in-home water treatment options. Access the USGS Maine Water Science Center for more information about water in Maine. Information about water quality nationwide is found on the USGS National Water-Quality Assessment Program site.

New One-Stop Source for Scientific Information about U.S. Oceans and Waters

OC_Web@usgs.gov (Office of Communications and Publishing) — Thu, 28 Jan 2010 16:57:15 EDT

A one-stop source for biogeographic information collected from U.S. waters and oceanic regions is now available from the National Biological Information Infrastructure (NBII) Program.

The OBIS-USA website offers a unique combination of tools, resources, and biodiversity information to aide scientists, resource managers and decision makers in the research and analyses critical to sustaining the nation’s valued marine ecosystems.

OBIS-USA was established in 2006 in cooperation with the U.S. National Committee for the Census of Marine Life a committee composed of renowned marine community leaders. OBIS-USA – a partnership of state, federal and scientific organizations -- is the United States’ contribution to the International Ocean Biogeographic Information System, an effort led by the Census of Marine Life to provide “open access” to global biodiversity data on the myriad of marine life that inhabits the ocean.

Sea angel (Clione limacina), the most common shell-less pteropod of arctic waters. Courtesy of the census of Marine Life Arctic Ocean Diversity project, © Kevin Raskoff. (Full size image)

Green sea turtle, Hawaii. Photo by Paul Wang. (Full size image)

“The world’s ocean is critically important, not only because of how it influences the climate, but also because it provides the resources for commercial, recreational, cultural, scientific, conservation, and national security activities,”” said John Mosesso, OBIS-USA co-lead. “At the same time, the ocean is threatened by a variety of changes, including warming temperatures, increasing ocean acidity, invasion by non-native species, overharvesting, and loss of habitat for species of concern.”

OBIS-USA provides data and functional tools to address key questions and information needs related to scientific understanding of sustainable and resilient ecosystems, marine spatial planning, climate change, ocean acidification, invasive species, and managing the nation’s fisheries. To address these ocean threats requires access to critical information on marine biodiversity, Mosesso noted.

OBIS-USA data holdings comprise millions of individual records supplied by marine data sponsors from across the nation. The site provides a work space for visitors to search and manipulate that data. This is accomplished in collaboration with data providers to produce a compilation of data in a common format. Data are interoperable and can be consistently viewed and applied by researchers, decision makers and resource managers.

Users can search and download data and metadata describing when and where species were observed or collected. The site’s offerings are available through an atlas (where users can review and select specific data sets). Individual or composite data sets (user-created selections from the entire holdings) may be viewed through several functions, including:

data dashboard - provides a pictorial view of data attributes that lets users assess their utility;
data richness - assesses how well the data are populated for selected elements;
data quality - provides key data collection information;
duplication status - indicates if a data set may contain duplicate records;
general metadata – displays the Federal Geographic Data Committee data record;
geographic coverage – displays data collection sites spatially;
participants - names OBIS-USA participants, with the option to connect back to the atlas, dashboard, and metadata functions; and
taxonomic depth - table shows the levels of taxonomic hierarchy for each organism.

OBIS-USA goals this year include an increase to over 10 million total data records and expanded functionality to address needs such as integration with non-biological data and further capability regarding species distributions.

To learn more about OBIS-USA, including growing its list of data and exploring partnerships, contact the NBII’s Mark Fornwall or John Mosesso.

Coordinated by the U.S. Geological Survey, the NBII is a broad, collaborative program to provide increased access to data and information on the nation's biological resources.

OBIS-USA screen shot showing 396 observations of sea angel (Clione limacina). (Data set searched: ArcOD - the Census of Marine Life Arctic Ocean Diversity project) (Full size image)

New Research Findings Can Improve Avian Flu Surveillance Programs

OC_Web@usgs.gov (Office of Communications and Publishing) — Tue, 12 Jan 2010 11:34:10 EDT

Genetic analyses of avian influenza in wild birds can help pinpoint likely carrier species and geographic hot spots where Eurasian viruses would be most likely to enter North America, according to new U.S. Geological Survey research.

Persistence of the highly pathogenic avian influenza H5N1 (HPAI H5N1) virus in Eurasia and Africa, and concerns that the virus might be transported among continents by migratory birds has resulted in global surveillance programs. In the United States, state and federal agencies tested more than 326,000 wild bird samples from across the country from 2005 to 2008.

The new work by USGS has nationwide importance because it offers a method for avian influenza surveillance programs to target their efforts for the right species and in the best locations.

In the study, USGS scientists conducted the first-ever survey of avian influenza gene variation in a single host species -- the northern pintail -- at each end of the bird's migratory flyway in North America: Alaska and California. These birds migrate between North America and Eurasia and in Japan and China have been known to occur in outbreak areas of HPAI H5N1.

The researchers discovered that some avian influenza viruses recovered from the North American pintails contain genes that are more closely related to influenza viruses in Eurasia, and that the greatest number of these genes occurred in pintail viruses from Alaska. In contrast, northern pintails sampled on their main wintering areas in California had few Eurasian virus genes.

The researchers speculate that Euasian flu genes become less prevalent as birds migrate southward in fall due to rapid mutation and reassortment, common to influenza viruses, and dilution by existing North American flu viruses. Reassortment, a shuffling process among viruses that infect the same host, occurs in all types of influenza A viruses, including H1N1 and H5N1.

“Our research demonstrates a genetically based technique for prioritizing wild bird species that are targeted for surveillance,” said Dr. John Pearce, a USGS scientist and lead author of the study. “Refining the list of priority species for surveillance by this method can reduce time and effort involved in surveillance sampling and is needed not only for Alaska, but also for those species along the North

Atlantic coast of North America that may engage in transcontinental migrations, such as shorebirds and gulls,” Pearce said.

With few exceptions, genetic evidence for transcontinental avian influenza virus exchange in North America has come from coastal regions closest to Europe or Asia – Alaska and the North Atlantic.

These areas, said Pearce, probably represent the first or primary areas of contact for foreign viruses, yet only about a third of birds tested for HPAI H5N1 in the United States so far have been from these regions.

“Based on this new genetic evidence, one possible new strategy would be to target surveillance efforts on species in these coastal regions that are geographically closer to current sources of the highly pathogenic H5N1 virus,” Pearce said. “If there is no evidence of transcontinental avian influenza virus gene exchange for a certain species or regional pathway, then those species and areas could be deemphasized in future surveillance programs.”

The research was published in the November 2009 issue of Evolutionary Applications, and was authored by scientists from three USGS centers: the USGS Alaska Science Center, the USGS National Wildlife Health Center, and the USGS Western Ecological Research Center.

Chloride Found at Levels that Can Harm Aquatic Life in Urban Streams of the Northern U.S.--Winter Deicing a Major Source

OC_Web@usgs.gov (Office of Communications and Publishing) — Wed, 16 Sep 2009 9:00:00 EDT

The USGS report and maps of monitoring sites are available online.

Levels of chloride, a component of salt, are elevated in many urban streams and groundwater across the northern U.S., according to a new government study.

Chloride levels above the recommended federal criteria set to protect aquatic life were found in more than 40 percent of urban streams tested. The study was released today by the U.S. Geological Survey (USGS). Elevated chloride can inhibit plant growth, impair reproduction, and reduce the diversity of organisms in streams.

The effect of chloride on drinking-water wells was lower. Scientists found chloride levels greater than federal standards set for human consumption in fewer than 2 percent of drinking-water wells sampled in the USGS study.

Use of salt for deicing roads and parking lots in the winter is a major source of chloride. Other sources include wastewater treatment, septic systems, and farming operations.

“Safe transportation is a top priority of state and local officials when they use road salt. And clearly salt is an effective deicer that prevents accidents, saves lives, and reduces property losses,” said Matthew C. Larsen, USGS Associate Director for Water. “These findings are not surprising, but rather remind us of the unintended consequences that salt use for deicing may have on our waters. Transportation officials continue to implement innovative alternatives that reduce salt use without compromising safety.”

This comprehensive study examines chloride concentrations in the northern U.S. covering parts of 19 States, including 1,329 wells and 100 streams.

Selected Highlights

Land use matters

Chloride yields (the amount of chloride delivered per square mile of drainage area) were substantially higher in cities than in farmlands and forests. Urban streams carried 88 tons of chloride per square mile of drainage area. Forest streams carried about 6 tons of chloride per square mile.
Only 4 percent of the streams in agricultural areas had chloride levels that exceeded the recommended federal criteria set to protect aquatic life (compared to more than 40 percent of urban streams). Overall, 15 percent of all streams had chloride levels exceeding the criteria.
Chloride concentrations in shallow groundwater (not used for drinking) were 16 times greater in urban areas than in forests, and 4 times greater in urban areas than in agricultural areas.

Highest levels in streams in the winter

In urban streams, the highest levels of chloride (as great as 4,000 parts per million, which is about 20 times higher than the recommended federal criteria) were measured during winter months when salt and other chemicals are used for deicing.

Increases over time

Increases in chloride levels in streams during the last two decades are consistent with overall increases in salt use in the U.S. for deicing.
Increasing chloride yields are linked to the expansion of road networks and parking lots that require deicing, increases in the number of septic systems, increases in wastewater discharge, and increases in saline groundwater from landfills.

Sources can vary locally

Chloride in ground and surface waters comes from many sources including the use and storage of salt for deicing roads, septic systems, wastewater treatment facilities, water softening, animal waste, fertilizers, discharge from landfills, natural sources of salt and brine in geologic deposits, and from natural and human sources in precipitation.

Measuring Snow with a Bucket, a Windmill, and the Sun? The Government Goes Off the Power Grid in Maine

OC_Web@usgs.gov (Office of Communications and Publishing) — Tue, 21 Apr 2009 6:58:12 EDT

In Maine, government scientists have figured out how to measure snowfall in remote areas with a bucket, a small windmill, and the sun - all the while saving money, energy, and, ultimately helping to save lives.

What led to this energy-efficient ingenuity was the need to help the National Weather Service forecast and predict the risk of floods from spring snowmelt.

The problem was this: While the USGS has about 15 snowmelt measurement sites in Maine, they also needed a way to measure snowfall in remote areas where power grids are scarce. Emergency managers need accurate information to prepare for forthcoming hazards and energy companies need to plan ahead for how much water to expect in reservoirs.

"We needed to find an alternative power source," said Bob Lent, chief of the USGS Maine Water Science Center in Augusta. "So we cobbled together a small-scale commercial windmill to replace commercial AC power, and supplemented the windmill with solar panels. What we ended up with is a windmill that powers our measurements on windy and cloudy days, and solar panels that power them on calm, sunny days," said Lent. "And," he added, "not only will we get more accurate information, but the systems will pay for themselves in about 3 to 4 years since using the electricity-dependent devices cost between $200 and $400 a year."

A prototype system has been housed in use at the USGS office in Augusta for the past winter. It has proved so accurate, said Lent, that the USGS plans to install four snowfall sites around the state this summer using the same system.

Basically, the system looks like this: a gage is attached to a 5-gallon bucket that sits atop a simple wooden platform on a metal pole. The gage has a heating element to melt the snow as it collects in the cone of the bucket. The gage only turns on when snow is detected. Nearby is a data-collection box that is linked to the windmill and solar panels. When the bucket fills up with melted snow it tips over and empties. Each tip of the bucket measures 0.01 inches of precipitation and is recorded to the data recorder, which transmits the data and is updated on the web every hour.

"We are very optimistic about the utility of this system in other remote areas in the country and not just for snowfall measurements. It would be good for any remote site that needs more power than solar alone can deliver. For example, this could be used to measure water quality in the swamps of Florida as well as snowfall in Maine," Lent noted.

"It's a very small step in a very long journey of helping this country become greener, but this embodies what we need to be doing and the direction in which we need to be going," said Lent.