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Inactive trout come out at night : behavioral variation, circadian activity, and fitness in the wild [Ecology]

Keywords : dispersal, light reaction, open-field test, reaction norm, salmonid

par Frédéric Magné - publié le

Theory suggests that high activity levels in animals increase growth at the cost of increased mortality. This growth-mortality tradeoff has recently been incorporated into the wider framework of the pace-of-life syndrome (POLS) hypothesis. However, activity is often quantified only in the laboratory and on a diurnal basis, leaving open the possibility that animals manage predation risk and feeding efficiency in the wild by modulating their circadian activity rhythms. Here we investigate how laboratory activity in wild brown trout parr (Salmo trutta L.) associates with circadian activity, growth, and mortality in their natal stream. (...)

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