Feast and Famine in the Anthropocene, from abundance to deficiencies: how do essential micronutrients influence evolutionary trade-offs of terrestrial wildlife?

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vendredi 20 déc. 03:55 PM (15 minutes)
Salle EFG
Humans are recommended to eat 10 servings of fruits and vegetables a day to meet their daily requirements in essential nutrients such as fibers, vitamins and minerals. In many organisms, from captive-reared invertebrates to humans, these essential micronutrients reduce the risks of heart disease and cancer, benefit reproduction, offspring growth, influence behavior and can prolong lifespan. But what about wildlife? Do free-living animals have a varied-enough diet to meet their daily requirements in essential micronutrients? Ecosystem alteration is a well-documented phenomenon of the Anthropocene. Humans are changing the composition, diversity and functionality of most ecosystems; hence the diversity and quality of food for wild animals, which can have strong consequences on their life-history. This presentation will explore recent work on the effects of a gradient of abundance in key essential micronutrients on the trade-offs of terrestrial organisms: from deficiencies in crop monocultures to abundance in pulsed-resources systems of deciduous forests. Specifically, the work presented investigate how tryptophan (an essential amino acid) and its derivatives modulate the behavior and the trade-offs between growth, reproduction and self-maintenance of three vertebrate and one invertebrate species.

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