[Index Biologie] Pour parler de biologie

[Cryptobiose]

Des ptis bonhommes du clade Thecosomata

[Tugdual]

C'est grandiose ...

[Cryptobiose]

Par contre, je doute que l'orange soit un thecosomate en fait. Ça reste un ospitobranche, mais ça ressemble plus à un nudibranche, à la réflexion. Mais je ne trouve pas de sources, alors bon, tant pis

[jutana]

... la orange c'est une "Limace de mer (Coryphella polaris)"

http://www.chambre237.com/animal-earth- ... -animales/



https://www.google.com/intl/fr_fr/insid ... image.html

[Cryptobiose]

Aaaah trop cool, merci jutana !

Bah c'était bien un nudibranche au final ^^

[dpld]

C'est superbe, je n'ai plus envie de regarder autre chose et surtout j'aimerai apprendre ces petites choses.

Des ptis bonhommes du clade Thecosomata

[dpld]

La première et la troisième sont elle de la même famille. Visuellement elles sont très proches....

[Tugdual]

Pour le plaisir des yeux :
-> Microscopie optique : la beauté du monde vivant ...

[Tugdual]

Spécial dédicace pour Atom :
-> Les sublimes animaux marins du Grand Nord ...

[Cryptobiose]

merci c'est chouette

[3enfants]

Avez vous déjà regardé une feuille d'élodée au microscope ? A fort grossissement on voit les chloroplastes en mouvement.

[Cryptobiose]

La première et la troisième sont elle de la même famille. Visuellement elles sont très proches....

Oui c'est le même nudibranche (Coryphella polaris), vu sous un autre angle

[Cryptobiose]

Avez vous déjà regardé une feuille d'élodée au microscope ? A fort grossissement on voit les chloroplastes en mouvement.

Il y a cette vidéo
C'est joli, merci

[zad]

des nouveaux pokemons !

L'équipe d'explorateurs America’s Ocean Exploration Team a découvert d'incroyables espèces marines lors des 12 expéditions "Océano Profundo 2015" . Sous la direction de Okeanos Explorer, ces missions ont consisté à plonger à 6100 mètres de profondeur sous la surface de l'Océan afin de filmer et découvrir le fond marin près de Puerto Rico et des îles Vierges américaines.

http://www.spi0n.com/etrange-creature-marine-inconnue/

[Cryptobiose]

The Sixth Extinction

This chart shows the enormous uptick in species extinction over the last century.

Paul Ehrlich and others use highly conservative estimates to prove that species are disappearing faster than at any time since the dinosaurs’ demise.

There is no longer any doubt: We are entering a mass extinction that threatens humanity’s existence.

That is the bad news at the center of a new study by a group of scientists including Paul Ehrlich, the Bing Professor of Population Studies in biology and a senior fellow at the Stanford Woods Institute for the Environment. Ehrlich and his co-authors call for fast action to conserve threatened species, populations and habitat, but warn that the window of opportunity is rapidly closing.

“[The study] shows without any significant doubt that we are now entering the sixth great mass extinction event,” Ehrlich said.

Although most well known for his positions on human population, Ehrlich has done extensive work on extinctions going back to his 1981 book, Extinction: The Causes and Consequences of the Disappearance of Species.

He has long tied his work on coevolution, on racial, gender and economic justice, and on nuclear winter with the issue of wildlife populations and species loss.

There is general agreement among scientists that extinction rates have reached levels unparalleled since the dinosaurs died out 66 million years ago. However, some have challenged the theory, believing earlier estimates rested on assumptions that overestimated the crisis.

The new study, published in the journal Science Advances, shows that even with extremely conservative estimates, species are disappearing up to about 100 times faster than the normal rate between mass extinctions, known as the background rate.

“If it is allowed to continue, life would take many millions of years to recover, and our species itself would likely disappear early on,” said lead author Gerardo Ceballos of the Universidad Autónoma de México.

Using fossil records and extinction counts from a range of records, the researchers compared a highly conservative estimate of current extinctions with a background rate estimate twice as high as those widely used in previous analyses. This way, they brought the two estimates – current extinction rate and average background or going-on-all-the-time extinction rate – as close to each other as possible.

Focusing on vertebrates, the group for which the most reliable modern and fossil data exist, the researchers asked whether even the lowest estimates of the difference between background and contemporary extinction rates still justify the conclusion that people are precipitating “a global spasm of biodiversity loss.” The answer: a definitive yes.

“We emphasize that our calculations very likely underestimate the severity of the extinction crisis, because our aim was to place a realistic lower bound on humanity’s impact on biodiversity,” the researchers write.

To history’s steady drumbeat, a human population growing in numbers, per capita consumption and economic inequity has altered or destroyed natural habitats. The long list of impacts includes:

Land clearing for farming, logging and settlement
Introduction of invasive species
Carbon emissions that drive climate change and ocean acidification
Toxins that alter and poison ecosystems

Now, the specter of extinction hangs over about 41 percent of all amphibian species and 26 percent of all mammals, according to the International Union for Conservation of Nature, which maintains an authoritative list of threatened and extinct species.


“There are examples of species all over the world that are essentially the walking dead,” Ehrlich said.


As species disappear, so do crucial ecosystem services such as honeybees’ crop pollination and wetlands’ water purification. At the current rate of species loss, people will lose many biodiversity benefits within three generations, the study’s authors write.

“We are sawing off the limb that we are sitting on,” Ehrlich said.

Source

Voir l'étude complète (en anglais) en pdf, en PJ.

Quand je lis ce genre d'études, et que je sais qu'aucun grand journal ne va la relayer, que pratiquement personne ne va en parler, je ne sais pas... Je ne comprends simplement pas le monde dans lequel on vit