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2 décembre 2015

Trap-jaw Ants Exhibit Previously Unseen Jumping Behavior [NC State University]

A species of trap-jaw ant has been found to exhibit a previously unseen jumping behavior, using its legs rather than its powerful jaws. The discovery makes this species, Odontomachus rixosus, the only species of ant that can jump with either its legs or its mandibles.

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2 décembre 2015

Theory of ’smart’ plants may explain the evolution of global ecosystems [Phys]

It’s easy to think of plants as passive features of their environments, doing as the land prescribes, serving as a backdrop to the bustling animal kingdom.
But what if the ecosystems of the world take their various forms because plant "decisions" make them that way ? A new theory presented by Princeton University researchers in the journal Nature Plants suggests that in some cases that may be exactly what happens. In one of the first global theories of land-biome evolution, the researchers write that plants may actively behave in ways that not only benefit themselves but also determine the productivity and composition of their environs.

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2 décembre 2015

Chez le fou à pieds bleus, vie de couple ne rime pas avec fidélité [Sciences et Avenir - Animaux]

Chez le fou à pieds bleus, plus une relation dure, plus grandes sont les chances pour le mâle d’être trompé.

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2 décembre 2015

Réchauffement climatique : la mort programmée des glaciers pyrénéens [La Dépêche du Midi]

Depuis 1900, la température a augmenté de 1,1° dans les Pyrénées. Une hausse significative qui a des conséquences sur les espèces et leur milieu. Certaines sont clairement menacées, tout comme les glaciers emblématiques du massif.

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30 novembre 2015

Study shows evolution does not always mean more diversification [Phys]

A small team of researchers with members from the U.S. and Switzerland has found an example of a fish that did not always benefit in the end from an evolutionary change. In their paper published in the journal Science, the team describes their study of cichlid fish species in Lake Victoria and other places, and the changes that led to their downfall in one ecosystem. Geerat Vermeij with the University of California offers a Perspectives piece on the work done by the group in the same journal issue.

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