El Gentraso

The fine line between clever and stupid

noreply@blogger.com (John Whitfield) — Mon, 12 Oct 2009 15:57:00 +0000

This advert is on display at many London Underground stations. It's for an energy drink that has never passed my lips, but which I believe is aimed at people who find Red Bull intimidatingly classy.

Let's move beyond the thought that it was someone's job to come up with that combination of words, other people's to approve it, and however much they all got paid is scant compensation for spending your waking hours doing that sort of thing. (Look - the arms holding it have got tattoos! Edgy!)

Instead, let's just enjoy the unintentional parallels with metabolic scaling. Although I'd obviously have been happier had it said 'Relative energy consumption is a function of size'.

Wikiecology

noreply@blogger.com (John Whitfield) — Thu, 13 Aug 2009 13:30:00 +0000

When I saw the graph on the front of today's technology Guardian, in an article about the slowing growth of Wikipedia (it's not in the online version), I thought: "That looks like a logistic growth curve. Perhaps the sum total of knowledge represents a resource that is being exhausted, causing the encyclopedia's growth to slow".

When I got to the end of the article, I discovered that the researcher behind the work being discussed, Ed Chi of PARC, had a similar thought.

"In my experience, the only thing we've seen these growth patterns [in] before is in population growth studies – where there's some sort of resource constraint that results in this model." The site, he suggests, is becoming like a community where resources have started to run out. "As you run out of food, people start competing for that food, and that results in a slowdown in population growth and means that the stronger, more well-adapted part of the population starts to have more power."

But the article also says that the slowdown is caused by a shift in power towards 'deletionist' editors - it's getting harder to get stuff onto Wikipedia. Which suggests that the correct model might not be a sort of density-dependent, resource-limited population (we're running out of stuff to create wikipedia entries about), but perhaps something more top-down, like a predator-prey system (the editor population is keeping the contributor population in check).

I've no idea, but it's a question entirely suitable to the tools of ecological analysis. Someone should get onto it.

Alilo, alilo, alilo

noreply@blogger.com (John Whitfield) — Thu, 06 Aug 2009 13:16:00 +0000

Some of the songs sang by Georgian choirs (not to be confused with Gregorian chant) predate the arrival of Christianity in the country. Or so I’ve read; I’d believe you if you told me they predate the big bang, so bottomless does the music sound.

One of the most spectacular gigs I’ve been to was the Rustavi Choir in London a few years ago. So when I was in the Sounds of the Universe shop in Soho a little while ago, I snapped up the 'Polyphonic Voices of Georgia' cd on Soul Jazz Records' new Word Audio Foundation imprint. (You can also hear Georgian singing on Soul Jazz's 'Faith' comp, which twiddles the dial on a world of religious music.)

The WAF cd, sung by the Anchiskhati Choir (me neither), is all religious songs, which means it misses out on the rougher-edged folk tradition - some of the harmonies are sweet and almost western. But it's still lovely. And, being Soul Jazz, they've made an effort - you get funky postcards, proper sleeve notes, and the cd comes in a cool but slightly-annoyingly-larger-than-usual plastic box - a bit like those cases that cassettes sometimes came in. Along with the monochrome cover photo, this gives the impression that the recording is in fact some academic ethnomusicology project from the 60s.

(if you like this sort of thing, Corsican and Sardinian male voice choirs sound similar to my ear.)

Before the carbon rush

noreply@blogger.com (John Whitfield) — Thu, 16 Jul 2009 13:08:00 +0000

The Economist's Natasha Loder has a post on her blog worth reading about the speculators getting preemptively involved in carbon forest credits in Papua New Guinea. A former Australian horse trader and cock-fighting impresario, it seems, is going around the place "signing up landowners for big carbon trading deals in advance of negotiations to trade forest carbon as offsets between countries".

There's something Conradian about this story; the old one of white folks going into the jungle to try and get rich, making up the rules as they go along. Is this how carbon trading is going to work?

Although not just white folks, apparently. Natasha is commenting on a story by the AP's Ilya Gridneff. I can't find the original elsewhere online (it's reproduced on her post), but a google reveals he's all over this kind of stuff in PNG. Sample first par: "A nephew of Papua New Guinea's Prime Minister Michael Somare is accused of pressuring remote villagers to sign away their land for carbon deals despite there being no carbon trade laws in place."

Thoughts on hearing the 7 o'clock news

noreply@blogger.com (John Whitfield) — Fri, 26 Jun 2009 09:33:00 +0000

A long time ago, BBC Radio 1 broadcast a documentary about Kraftwerk. The thing I remember most clearly from it was a story about how, when they heard 'Billie Jean', the band was thrown into crisis, believing that the song was such a leap forward that there was nowhere for them left to go.

Much later, I saw a clip of Jackson performing the same song at the Motown 25th Anniversay concert, and thought 'Well, pop music should have given up at that point, because nothing is ever going to top that.'

This morning, there were no tracks from 'Off the Wall' in the clips played on the Today programme (not big MJ fans, I guess), so we put the cd on. Anyone who doesn't like this record doesn't like happiness. Let us single out for praise 'Rock With You': that rare thing, a brilliant mid-tempo pop song, totally sophisticated and totally disco at the same time. You can imagine Smokey Robinson or Ella Fitzgerald singing it, and that's the company he deserves to be remembered alongside.

I give in

noreply@blogger.com (John Whitfield) — Fri, 19 Jun 2009 08:39:00 +0000

OK, so I've no desire to read anyone else's tweets, but I've been thinking that it's a good medium for saying 'hey, check this paper out', which is often all I want to do. So I've set up a feed, and put that last post on it. I think it's called @gentraso. We'll see if it's as colossal a waste of time as I've always believed.

9 July update. That really was a very graceless post, wasn't it? On poking around twitter, I can see that there's a some interesting stuff, and I can see how it's potentially addictive. I've still not signed up to follow anyone yet, though (though I may). And I'm still not sure where all the time for this stuff comes from.

Pigeons

noreply@blogger.com (John Whitfield) — Fri, 19 Jun 2009 08:32:00 +0000

They don't know much about art.
But they can learn what you like.

Seeds of an edible city architecture

noreply@blogger.com (John Whitfield) — Thu, 18 Jun 2009 13:03:00 +0000

I've got a piece in today's Nature looking at recent efforts to integrate plants and buildings to help produce food and adapt to climate change.

It's loosely pegged to three recently stopped or upcoming exhibitions: London Yields at the Building Centre; Vertical Gardens at Exit Art, New York (both finished); and Radical Nature at the Barbican, London (starting on Sat 19th).

Best. Title. Ever.

noreply@blogger.com (John Whitfield) — Wed, 17 Jun 2009 13:34:00 +0000

Nothing to do with ecology etc., but I couldn't resist saluting Peter Leeson for calling his book on the economics of piracy 'The Invisible Hook'.

I bet no other blog spots this

noreply@blogger.com (John Whitfield) — Mon, 08 Jun 2009 08:23:00 +0000

So, the avian gunge scraped out of the engine of the US airways flight that ditched in the Hudson river this January was (Canada) goose rillettes. Ho hum.

More exciting is this piece of nominative determinism (from the press release)...

“It’s important to not only know what species of birds are involved in collisions, but to also understand the role that migration plays in the larger picture,” said Carla Dove, a coauthor and program director at Smithsonian’s Feather Identification Laboratory.

Hear my voice

noreply@blogger.com (John Whitfield) — Tue, 02 Jun 2009 16:36:00 +0000

My south-London tones are getting an outing on US radio tomorrow, on New Hampshire Public Radio's Word of Mouth, from 12 noon EST. I'll be talking spite.

5 June Update. Here's what I said.

My journalistic heroes...

noreply@blogger.com (John Whitfield) — Fri, 29 May 2009 14:08:00 +0000

...are the guys who couldn't be arsed to follow up on Watergate. That's what I call work/life balance.

Why is it easier to get away with keeping a live leopard than wearing a dead one?

noreply@blogger.com (John Whitfield) — Fri, 29 May 2009 13:19:00 +0000

I can see why people take drugs, despite their illegality. Drugs get you high. But I find it a lot harder to understand the massive illegal trade in live animals. I guess a pet leopard or monitor lizard is a status symbol, but not one that's easy to flaunt, and what kind of a dick wants one in the first place?

That's what I thought when I read the excellent New Yorker piece ($) from April about the havoc being wreaked by escaped exotic pets in Florida.

The answer must be partly because the chances of getting caught are minimal and the punishments footling. That's unlikely to change (and besides, drugs policy shows how ineffective prohibition is). What we need instead is an effort to change norms. The animal rights movement has had some success in demonizing the wearing of fur (this train of thought was prompted when I saw the piece in today's Guardian about PETA's shock tactics, which I haven't read, because life's a bit on the short side), likewise the campaign against conflict diamonds. The conservation movement - so polite, reasonable and ineffectual compared with those who campaign for the welfare of captive animals - needs to do the same for exotic pets.

Of course, you wear a fur coat in public. Which brings me back to pondering the point of a status symbol you need to hide, and makes me wonder and despair at what in human nature (including mine) delights in ownership for its own sake.

More research is needed

noreply@blogger.com (John Whitfield) — Thu, 28 May 2009 16:01:00 +0000

Apparently, you need to kiss a lot of frogs before you find a prince.

Turns out you also need to examine a lot of piles of elephant dung before you find a frog. 48.33, to be precise.

Now, if someone could be a bit more quantitative about the frog/prince ratio, we could work out princes per pile of elephant dung.

Nascence man

noreply@blogger.com (John Whitfield) — Wed, 27 May 2009 14:51:00 +0000

Having been away from my computer, this is now a week old. But I've written a feature for Nature about Mike Russell's work on the origin of life, especially his efforts to recreate the key moment in the lab.

No animals, no trees

noreply@blogger.com (John Whitfield) — Wed, 27 May 2009 14:28:00 +0000

A couple of recent papers show how seed dispersal is harmed when forest vertebrates disappear - it's not just bees and microbes that provide ecosystem services, we need the big stuff too.

In Biotropica, Stephen Blake of the WCS and colleagues look at seeds in the dung of forest elephants in the Congo. There are a lot:

Analysis of 855 elephant dung piles suggested that forest elephants disperse more intact seeds than any other species or genus of large vertebrate in African forests, while GPS telemetry data showed that forest elephants regularly disperse seeds over unprecedented distances compared to other dispersers. ... Our results suggest that the loss of forest elephants (and other large-bodied dispersers) may lead to a wave of recruitment failure among animal-dispersed tree species, and favor regeneration of the species-poor abiotically dispersed guild of trees.

And in Ecological Applications a US/Thai team look at the impact of bushmeat hunting on the dispersal of the hog plum, Choerospondias axillaris which, as the name suggests needs mammals (although not just pigs) to move it about. The clue is in the paper's title 'Bushmeat poaching reduces the seed dispersal and population growth rate of a mammal-dispersed tree.' "Extinction of C. axillaris is a real possibility, but may take many decades," they add. "Recent and ongoing extirpations of vertebrates in many tropical forests could be creating an extinction debt for zoochorous trees whose vulnerability is belied by their current abundance."

In Guanacaste, Costa Rica, they (especially Dan Janzen) got round this problem by introducing cattle, replacing the large herbivores that had gone extinct in prehistory. The trees thrived as a result. But Guanacaste is a dry forest. To paraphrase the music hall song about the horse and the lighthouse, I imagine it'd be harder to keep a cow in a jungle.

Cruel to be kind

noreply@blogger.com (John Whitfield) — Thu, 14 May 2009 15:02:00 +0000

Why are people such *****? I've got a feature in this week's New Scientist looking into it.

Blood feuding and antagonistic pleiotropy

noreply@blogger.com (John Whitfield) — Wed, 13 May 2009 11:32:00 +0000

This week, I wrote a story for Nature’s online news about a PNAS paper on the link between violence and reproductive success in the Waorani, an Amazonian tribe. The basic message is that men who went on more blood-feud-motivated raids had fewer children surviving to adulthood. This is the opposite result to that found by Napoleon Chagnon’s studies of the Yanomano, where men who had killed in raids had more wives and children.

Chagnon’s work and methods have been controversial, and the debate around all that, and what this study says about the possible link between aggression, reproduction and natural selection is too complicated to go into here.

Instead I want to offer up some quarter-baked speculation on a slightly different topic. The paper suggests that one reason that Waorani violence seems counterproductive is that, unlike the Yanomano (and apparently other societies where blood feuding goes on), there’s no gap between rounds of violence. The Yanomano, says the paper, wait a generation between taking up the cudgels, during which time the attacks are sorcery-based. The Waorani were always at it.

This long delay reminded me of what’s called antagonistic pleiotropy. This is the idea that organisms age because natural selection can favour a gene that has a selective benefit in one’s youth but is detrimental later on — i.e., the bad stuff kicks in after you’ve bred and evolution has stopped caring about you. Could something similar, I wondered, allow delayed blood-feuding to persist, or even confer a benefit to such behaviour in some circumstances?

I can imagine how the initial aggressor might benefit. You prove your toughness in a handicap-principle kind of way, and/or reduce the competition, and then get to enjoy the benefits for a couple of decades. But what does he who waits get out of it? Maybe it reduces the cost that continual feuding imposes on everyone — apparently the Waorani were on their way to wiping themselves out. Or maybe the delay has kin-selection benefits — if the feud passes down the generations, maybe the next cohort gets to prove its toughness, reap the benefits etc.

I thought the analogy was interesting, but I don’t know if there’s any validity to this comparison, and I’m not saying blood feuding is, like, cool. And besides, these days we have libel lawyers to settle this sort of thing. Who, I suppose, are the sorcerers de nos jours.

Networks, finance and ecology

noreply@blogger.com (John Whitfield) — Fri, 01 May 2009 08:30:00 +0000

A couple of days ago, the FT reported on a speech by Andy Haldane, the Bank of England's head of financial stability:

Financial risk management and regulation should cast aside many elements of traditional finance theory and learn lessons from ecology, the spread of diseases, biology and engineering, according to a senior Bank of England official...

[Haldane] likened financial mathematical models which "pointed to the stabilising effects of financial network completeness" to the now-discredited 1970s-style ecological orthodoxy that asserted the complex networks of enemies and parasites in rainforests would always guarantee their survival.

What I think Haldane's talking about is the belief that more complex food webs were more stable, because diversity is, like, good. This was challenged by Bob May's famous 1973 finding that if you add links to a food web at random it actually becomes less stable the more complex it gets. SInce then, to quote a 2007 paper "the complexity–stability debate has been a central issue in ecology: does network complexity increase or decrease food-web persistence?"

And yet, to quote me, nature is full of large groups of species interacting in complex ways, and field and lab studies suggest that more complex, diverse ecosystems, in fact, show smaller fluctuations in their population sizes. So how's that work?

What ecology has shown us is that complexity per se isn't a disaster, so long as it's the right sort of complexity. Real food webs aren't random, and highly interconnected webs are in fact more robust to the removal of species - i.e. if one species/company goes extinct/bust, there isn't a cascade of other extinctions/bankruptcies. (This is Jennifer Dunne's work.)

The piece also says Haldane said that "the biggest and most interconnected banks should be subject to tougher regulations than smaller firms because they were most likely to be a super-spreader of financial risk. He likened them to heroin users or promiscuous homosexuals who were most likely to spread the HIV virus."

This is an allusion to the finding that small-world networks, such as the Internet, are robust to the removal of a random link, but very sensitive to the targeted removal of the best-connected links. This might be a bad thing in terms of cybercrime, but if you're trying to, say, stop disease spread, it can be turned to your advantage, because by targetting the best connected/most promiscuous individuals you can have a big impact on spread.

AIG, Citigroup etc., in other words, aren't too big to fail - they're too interconnected to fail.

Food webs are a bit different. In a study of the food webs of fish and plankton species living in lakes in the Adirondacks, Dunne and colleagues found that the species most vulnerable to extinction are the ones that result in the fewest secondary extinctions. This suggests, at least in the absence of human manipulation, that the structure of ecosystems maximizes biodiversity persistence. Researchers are now trying to deduce what shapes ecological networks into these robust configurations-forces such as natural selection or thermodynamic constraints on energy flows within the food web might each be at work.

So complexity per se isn't a bad thing. It's what you do with it that counts. Financially, what we need is to understand what makes a robust network, and then try and build that into the system - although that might not be compatible with everyone getting as rich as possible as quickly as possible. Then, although we won't see the shocks coming, we will be able to reduce their impact.

That's not to say the science is all neatly worked out. Haldane said that financial theory was a generation behind ecology. Which made me want to put my money under the mattress, because, although ecologists are getting some ideas about the general properties of ecological networks, food-web theory is still full of contradictory and disputed ideas. Still, maybe this will see a wave of ecologists following George Sugihara into finance, echoing the wave of maths and physics PhDs who became quants a decade or two ago. Remember how well that turned out?

Haldane's compete speech is here. (This post is based largely on the SFI Bulletin piece linked to above, 'Risk in Financial Markets - Learning from Nature' what I wrote (sound of own trumpet) 18 months ago.)

You have to laugh

noreply@blogger.com (John Whitfield) — Thu, 30 Apr 2009 09:28:00 +0000

From Terry Eagleton, writing in the London Review of Books ($):

During the Second World War, a woman was interned for five months when the authorities discovered an entry in her diary reading 'Destroy British Queen. Install Italian Queen.' She turned out to be a beekeeper.

A logic problem

noreply@blogger.com (John Whitfield) — Tue, 28 Apr 2009 09:07:00 +0000

Now class, what can we conclude from these two nearly adjacent papers in the current issue of Intelligence?

1. Intelligence and semen quality are positively correlated

2. Conservatism and cognitive ability
First sentence of abstract: "Conservatism and cognitive ability are negatively correlated."

More on maximum entropy

noreply@blogger.com (John Whitfield) — Tue, 03 Mar 2009 09:40:00 +0000

Over the past few years, I've written pieces for Nature ($) and PLoS Biology on using of theories of maximum entropy production to explain things relating to climate, biogeochemistry, and evolution. Naturwissenschaften has just published an open-access review by Axel Kleidon, one of the field's main men (particularly from the climate end of things), on that topic.

Blogging the Origin

noreply@blogger.com (John Whitfield) — Wed, 04 Feb 2009 14:33:00 +0000

I've been so busy doing this, I haven't got round to linking to it from here. But I am. On scienceblogs.

Does 'junk food' threaten marine predators in northern seas?

noreply@blogger.com (John Whitfield) — Fri, 19 Dec 2008 09:37:00 +0000

I've got a piece in today's Science looking at what's called the junk-food hypothesis. This is the idea that climate driven changes to food webs are hurting marine predators either by causing their preferred prey to be replaced by less nutritious species, or by causing those prey species to become less nutritious themselves.

Here's the intro...

In 2004, ecologist Sarah Wanless was observing a colony of guillemots on the Isle of May off the coast of southeast Scotland. These diving seabirds were having a terrible breeding season in the United Kingdom, and some colonies hatched no chicks at all. But Wanless could see that parent birds were catching as many fish as ever, if not more. "We couldn't work out what was going wrong," she said. The light dawned when she and her colleagues measured the fat and protein in the fish being caught, mostly sprat, a member of the herring family. Compared with previous years, the amount of energy a hungry guillemot received from a 10-centimeter sprat plunged in 2004, dropping from 55 kilojoules to 12 kilojoules. "They were largely water," Wanless says.

And for keenies, and because Science's News Foci don't have reference lists, here, in no particular order, is some further reading. All free unless otherwise stated.

Low energy values of fish as a probable cause of a major seabird breeding failure in the North Sea

Community reorganization in the Gulf of Alaska following ocean climate regime shift

Junk food in marine ecosystems (not free, but there's a press release).

Pollock and the decline of Steller sea lions: testing the junk-food hypothesis

A Critical Review of the Regime Shift-“Junk Food”-Nutritional Stress Hypothesis for the Decline of the Western Stock of Steller Sea Lion

Enjoy!

Happy Christmas!

noreply@blogger.com (John Whitfield) — Wed, 17 Dec 2008 08:58:00 +0000

Average intelligence predicts atheism rates across 137 nations

(Addendum: Turns out this paper got tons of coverage earlier in the year. I should really google paper titles before I link to them.)