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. 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

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. [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. TOXIC: Garbage Island | Toxic. 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 | Toxic

But I should also point out that I’m not one of those Andrew Dice Clay “Fuck the whales” types either. [2011] The Mystery of the Canadian Whiskey Fungus | Magazine. 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 | Magazine

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.

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

Celle de Marion Vicart, à la soutenance de laquelle j'ai assisté l'autre jour, est de celles-là. Marion propose une méthode d'observation et de description du chien, fondée sur les principes de l'anthropologie d'Albert Piette qui se concentre sur l'existence "en mode mineur", c'est à dire notre façon d'être au monde hors des pics d'action et de temporalité - ce que Proust appelait le sentiment de l'existence tel qu'il frémit au fond d'un animal . S'affranchissant des questionnements limités au comportement pour se consacrer à l'ontologie, ce mode d'observation s'attache à tous les détails qui montrent qu'un être est en vie, indépendamment de ce qu'il "fait" ou non.

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. 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.

Expressions faciales et attitudes corporelles

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

Le premier était au Muséum, consacré aux dynamiques participatives autour des pigeons en ville (rôle des citoyens, des élus, des scientifiques, formation de consensus, réponse des pigeons aux solutions proposées), bref un effort réussi visant à appréhender les "collectifs" et à extrapoler à la question de la restauration de la biodiversité. Le deuxième était à Nanterre, labo d'éthologie, et j'en étais l'invité. 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. CAT scans). This realization emphasizes the need for assessment and quantification of biological effects of radiation on living organisms. Here we report the results of an environmental analysis based on extensive censuses of abundance of nine animal taxa (spiders, dragonflies, grasshoppers, bumblebees, butterflies, amphibians, reptiles, birds, mammals) around Chernobyl in Ukraine and Belarus during 2006–2009.

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. Résultat, le panda serait génétiquement proche du chien... Chaque semaine ou presque, on évoque le séquençage du génome d'un animal – dernièrement, celui du cheval – mais il est difficile, de prime abord, de comprendre l'intêret de ces travaux de longue haleine.Pas moins de 120 scientifiques, chinois pour la plupart, se sont attelés à cette tâche. 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. [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. Stunned by the lack of scientific research on octopuses, Godfrey-Smith is now studying their intelligence, and whether their tentacles have minds of their own. If you were an octopus, would you view the world from eight different points of view?

Nine?

Ascension Island

[2010] Biodiversity's bright spot. Tamarin lion doré, les raisons d’un succès. Editorial - Carp and the Lakes. La France peut-elle sauver le thon rouge ? - Eco(lo) - Blog LeMo. Linepithema humile. Argentine ant. Invasion. Les jours comptés du lac Inle. 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.