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4 septembre 2017

Birds choose mates with ornamental traits [Phys]

A recurring theme in nature documentaries is that of choosy females selecting brightly colored males. A new study shows that, in monogamous mating systems, male birds may select their lifelong mates in much the same way.

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4 septembre 2017

We may finally understand why tropical plants have huge leaves [New Scientist]

To solve this puzzle, Ian Wright at Macquarie University in Sydney and his colleagues studied the leaves of 7670 plant species found at different latitudes. The team looked at the relationship between leaf size and various aspects of climate, including day and night temperatures, rainfall and humidity.

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1er septembre 2017

Evolution : comment les champignons sont-ils devenus hallucinogènes ? [Sciences & Avenir - Evolution]

La première étude jamais réalisée sur le génome de ces champignons aux effets psychédéliques montre que ces propriétés pourraient avoir été sélectionnées comme arme contre les insectes.

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1er septembre 2017

Honeybees become workers or queens depending on the plant microRNAs in their diet [Phys]

Bee larvae develop into workers, in part, because their diet of pollen and honey, called beebread, is rich in plant regulatory molecules called microRNAs, which delay development and keep their ovaries inactive. Xi Chen of Nanjing University in China and colleagues, report these August 31, 2017 in PLOS Genetics.

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31 août 2017

A new estimate of biodiversity on Earth [Phys]

In a new paper published in The Quarterly Review of Biology (September 2017), researchers from the University of Arizona have estimated that there are roughly 2 billion living species on Earth, over a thousand times more than the current number of described species.

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