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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.

Some achieve the feat in seconds, which is essential to conserving heat on a cold day. Some furry animals are aided by loose skin, which “whips the fluid around much faster than if the skin was tight”, says Hu. Les plantes sauvages des villes livrent leurs premiers secrets. Le Monde.fr | • 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

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. What's more, for years this place had a secret. A satellite view of Ball's Pyramid in the Tasman Sea off the eastern coast of Australia. Toggle caption Google Maps. [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

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

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. [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

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. 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

Expressions faciales et attitudes corporelles. Le lecteur attentif aura remarqué, à la fin de la note intitulée " Un jardin ", quelques photographies de la chienne Sarah montrant la diversité de ses expressions faciales. Tandis que nous autres parlons "chienchien", les chiens, eux, s'expriment grâce à la mobilité de leurs muscles faciaux et craniaux (le terme n'existe pas) qui leur permet de bouger les oreilles, les lèvres ("babines"), de retrousser le nez ("museau"), de jouer de l'intensité de leur regard en fonction de la position des paupières, etc.

Une palette d'expressions, donc, magistralement inventoriées par Gary Larson (tous droits réservés) dans le schéma suivant: 17 Things Worth Knowing About Your Cat - The Oatmeal - Spéciation culturelle. Longue mais intéressante journée aujourd'hui, avec deux séminaires.

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. Des chercheurs chinois ont décodé le génome du panda géant en utilisant une nouvelle technique de séquencage de l'ADN.

Pourquoi les pandas ne mangent que du bambou ? - En quête de sci

Résultat, le panda serait génétiquement proche du chien... Les animaux malades de la peste nucléaire. Tchernobyl, destructeur de biodiversité par Valéry Laramée de Tannenberg Cet article est extrait du Journal de l’Environnement (ici), et m’a paru si clair, si net, à ce point informé que j’ai décidé de le mettre en ligne ici, espérant que l’auteur ne m’en voudra pas. En tout cas, bravo. Au printemps, lorsque l’on visite la zone d’exclusion de Tchernobyl, c’est toujours le même rituel. [2010] Hybrids May Thrive Where Parent Species Fear to Tread - NYTimes.com. 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.

(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. Stephanie Mitchell/Harvard Staff Photographer Peter Godfrey-Smith has been intrigued by octopuses for years, diving in and around Sydney Harbour during summer breaks in his native Australia.

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. 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. Un article de Wikipédia, l'encyclopédie libre.

La fourmi d'Argentine (Linepithema humile), originaire d'Amérique du Sud, forme une supercolonie qui va des côtes italiennes aux côtes espagnoles en passant par la France (soit plusieurs centaines de kilomètres), et extermine les espèces déjà en place. Description[modifier | modifier le code] Taille : ouvrière 2,1 à 3 mm ; femelle sexuée 4,5 à 4,9 mm ; mâle 1,9 à 2,1 mm. Argentine ant. The Argentine ant, Linepithema humile (formerly Iridomyrmex humilis), is a dark ant native to northern Argentina, Uruguay, Paraguay, and southern Brazil.

Invasion. 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. Kay Lar, Myanmar. Le soir, quand le soleil disparaît peu à peu derrière les collines au sud de Mandalay et que l’eau clapote sur la coque des bateaux de pêche, il est tentant de s’imaginer que le reste du monde n’existe plus. En réalité, et plus pragmatiquement, c’est le célèbre lac Inle qui est en train de disparaître. Laurie Santos: How monkeys mirror human irrationality‬‎ The Oceans Are Getting Louder - Environment - io9. Schoolboy explodes goldfish memory myth - National - theage.com. Scientists say dolphins should be treated as 'non-human persons'. Expertise douleurs animales chez animaux elevage. Nociception and Pain in Teleost Fish - Norges veterinærhøgskole.