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Animaux, éthologie, écosystêmes

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Scientists do the wet-dog shake. Armed with a little more than a hose and high-speed video equipment, researchers have cracked one of science’s wettest problems.

Scientists do the wet-dog shake

As dog-owners know all too well, when their canine companions take a dip in a pond this is swiftly followed by a twisting shake-down that involves an ecstasy of flopping ears and flapping jowls. But do all furry mammals use the same tactic to dry themselves? And how fast do they need to shake? With the help of an accommodating zoo, David Hu and his colleagues at the Georgia Institute of Technology in Atlanta studied 16 soggy species, including mice, dogs, tigers and bears, and found that each creature tunes its shaking speed to get as dry as possible without wasting too much energy.

Les plantes sauvages des villes livrent leurs premiers secrets. Le | • Mis à jour le | Par Angela Bolis Discrètes, ordinaires, elles sont pourtant omniprésentes et trouvent refuge dans le moindre recoin des rues.

Les plantes sauvages des villes livrent leurs premiers secrets

Elles courent le long des trottoirs, jaillissent de la lézarde d'un mur, s'incrustent entre deux pavés. Les plantes sauvages des villes font, depuis un an, l'objet de recherches du Museum national d'histoire naturelle à travers un observatoire de sciences participatives, baptisé Sauvages de ma rue.

The Pacific great garbage patch

[2012] Six-Legged Giant Finds Secret Hideaway, Hides For 80 Years. No, this isn't a make-believe place.

[2012] Six-Legged Giant Finds Secret Hideaway, Hides For 80 Years

It's real. They call it "Ball's Pyramid. " It's what's left of an old volcano that emerged from the sea about 7 million years ago. A British naval officer named Ball was the first European to see it in 1788. It sits off Australia, in the South Pacific. [2012] Oh, This Is Great. I’m not one of those guys who corners folks at parties to rant at them about biodiesel or calls people “fucking idiots” for being skeptical about global warming.

[2012] Oh, This Is Great

But I should also point out that I’m not one of those Andrew Dice Clay “Fuck the whales” types either. The problem with all the bravado on both sides of the ecology debate is that nobody really knows what they’re talking about. Trying to form opinions on climate change, overpopulation, and peak oil hinges on ginormous leaps of faith based around tiny statistical deviances that even the scientists studying them have a hard time understanding. TOXIC: Garbage Island. By Thomas Morton Photos by Jake Burghart I’m not one of those guys who corners folks at parties to rant at them about biodiesel or calls people “fucking idiots” for being skeptical about global warming.

TOXIC: Garbage Island

[2011] The Mystery of the Canadian Whiskey Fungus. A scanning electron microscope image (500X) of the mold found outside the Hiram Walker Distillery.Photo: Caren Alpert The air outside a distillery warehouse smells like witch hazel and spices, with notes of candied fruit and vanilla—warm and tangy- mellow.

[2011] The Mystery of the Canadian Whiskey Fungus

It’s the aroma of fresh cookies cooling in the kitchen while a fancy cocktail party gets out of hand in the living room. James Scott encountered that scent for the first time a decade ago in a town called Lakeshore, Ontario. Just across the river from Detroit, Lakeshore is where barrels of Canadian Club whiskey age in blocky, windowless warehouses. Scott, who had recently completed his PhD in mycology at the University of Toronto, had launched a business called Sporometrics.

La convergence évolutive

F.2. Phénoménographie équitable - La phénoménographie anthropologique. F.4. La thèse terminée : Des chiens auprès des hommes - La phénoménographie anthropologique. Ce que font les chiens quand ils ne font rien. Il est rare qu'une thèse de doctorat suscite ainsi l'intérêt, voire une forme d'étonnement.

Ce que font les chiens quand ils ne font rien

Can Humans Run as Fast as Animals? Do squirrels and pigeons get all sweaty in hot weather? - By Bri. An oppressive heat wave continues to punish the Northeast this week.

Do squirrels and pigeons get all sweaty in hot weather? - By Bri

Temperatures in New York City, Boston, Baltimore, and Washington, D.C., all topped 100 degrees on Tuesday, as residents sagged and perspired. What about our urban animal friends—are pigeons and squirrels getting sweaty, too? In the first place, small animals don't have to work very hard at keeping cool. They have a higher surface-to-mass ratio, so they radiate heat more efficiently. Pigeons and squirrels can also tolerate a greater internal temperature range than people. While most animals don't sweat very much, many species rely on the principle behind sweating to keep cool: Moisture on the skin absorbs heat and evaporates, carrying away unwanted warmth. Expressions faciales et attitudes corporelles. 17 Things Worth Knowing About Your Cat - The Oatmeal - Spéciation culturelle. Ecological Indicators : Efficiency of bio-indicators for low-level radiation under field conditions. Abstract Relatively little is known about biological consequences of natural variation in background radiation, and variation in exposure due to nuclear accidents, or even the long term consequences to human health stemming from the over-use of nuclear medicine and imaging technologies (i.e.

Ecological Indicators : Efficiency of bio-indicators for low-level radiation under field conditions

CAT scans). This realization emphasizes the need for assessment and quantification of biological effects of radiation on living organisms. Pourquoi les pandas ne mangent que du bambou ? - En quête de sci. Les animaux malades de la peste nucléaire. [2010] Hybrids May Thrive Where Parent Species Fear to Tread - Soft-headed intellectuals. Octopus Intelligence. TOOL USE Octopuses will carry around two halves of an empty coconut shell and then hide inside them to avoid predators, a team of Australian researchers reported in late 2009.

Octopus Intelligence

(Videos of this trick are easy to find on YouTube.) Tool use is considered a mark of cognitive sophistication; aside from humans, only a few creatures—including some primates, certain birds, and dolphins—have been shown to make and use tools. So far, the octopus is the only invertebrate known to manipulate tools.. PROBLEM SOLVING It requires a certain kind of smarts for a creature to recognize that its efforts to solve a problem aren't working, and then to switch to a new strategy. The octopus seems capable of just that. STEALTH MOTION CAMOUFLAGE Hanlon calls it "the moving rock trick": When an octopus has to move across the open sea, it will take on the appearance of a rock and slowly creep along the ocean floor. Subsequent studies, published in 2003 and 2006, documented play-like behavior with Legos. [2010] Thinking like an octopus.

Ascension Island

[2010] Biodiversity's bright spot. Tamarin lion doré, les raisons d’un succès. Les efforts conjugués des écologistes, des élus et des paysans ont permis de sauver ce primate emblématique et son écosystème. A moins de deux heures de Rio, un petit groupe d’écotouristes parcourt une parcelle de forêt à la recherche des représentants de l’un des rares succès de la protection de la biodiversité sur Terre. Près de la ville de Silva Jardim, les visiteurs sont accueillis par des couinements suraigus en provenance des frondaisons. Quelques secondes plus tard, ils distinguent des taches orange volant de branches en branches : trois familles de tamarins lions dorés (Leontopithecus rosalia) se disputent un territoire exigu.

Dans cette forêt, la surpopulation de ces petits singes turbulents est réjouissante mais c’est également la preuve que le com­bat n’est pas fini. Editorial - Carp and the Lakes. La France peut-elle sauver le thon rouge ? - Eco(lo) - Blog LeMo. Le thon rouge est-il une espèce menacée au point d'en interdire le commerce international ? C'est à cette question que devait répondre hier le Premier ministre, François Fillon, au terme d'une réunion avec les ministres de l'Agriculture, de l'Ecologie et des Finances. Un sujet hautement sensible, au point que Matignon s'en est finalement remis à l'Elysée. Mais Nicolas Sarkozy n'a toujours pas tranché. Linepithema humile. Argentine ant. The Argentine ant, Linepithema humile (formerly Iridomyrmex humilis), is a dark ant native to northern Argentina, Uruguay, Paraguay, and southern Brazil.

It is an invasive species that has been established in many Mediterranean climate areas,[1] inadvertently introduced by humans to many places, including South Africa, New Zealand, Japan, Easter Island, Australia, Hawaii, Europe, and the United States. Description[edit] The worker ants are about 3 millimetres (0.12 in) long and can easily squeeze through cracks and holes no more than 1 millimetre (0.039 in) in size.

Queens are two to four times the length of workers. Invasion. I was never the first to see them until they became all that I saw. My daughter would see them before I did because she lived at their level and has good eyes. My wife would see them before I did because she was the first to get out of bed. I would wake up and go to the kitchen, and she would already be standing on a chair in her nightie, like the housewives in fifties sitcoms who were scared by mice. She'd have a blue bottle of glass cleaner in one hand and a roll of paper towels in the other, and she'd be engaging in a solitary orgy of prophylaxis.

Les jours comptés du lac Inle. Malmené par l’agriculture et le tourisme, ce célèbre site du Myanmar voit sa superficie diminuer et sa pollution augmenter. Laurie Santos: How monkeys mirror human irrationality‬‎ The Oceans Are Getting Louder - Environment - io9. Schoolboy explodes goldfish memory myth - National - Scientists say dolphins should be treated as 'non-human persons' Expertise douleurs animales chez animaux elevage. Nociception and Pain in Teleost Fish - Norges veterinærhøgskole.