The effect of environmental unpredictability as a driver of local adaptations in blue tits (Cyanistes caerulens)

Poster session
Partie de:
11:30, vendredi 20 déc. 2019 (1 heure)
Dîner   12:30 PM à 01:30 PM (1 heure)
Salle ABCD

Understanding how uncertainty and environmental unpredictability can influence an organism's capacity to adapt to a given environment is a central question in evolutionary biology as environmental stochasticity is a common characteristics of all habitats. When those environmental changes are trackable by the organisms, plasticity can be expected to emerge as a way to cope with those changes. However, Long-term unpredictable environmental conditions are expected to result in the evolution of bet-hedging strategies where the organism reduces its fitness variance at a cost of reduced mean fitness. This risk aversion strategy would emerge due to the fact that fitness is determined by the multiplicative process of reproduction. Therefore, natural selection over long-term unpredictable environmental conditions would maximise the geometric component of fitness. The goal of this study is to quantify environmental unpredictability in three contrasted populations of blue tits (Cyanistes caerulens) and to understand its relation with the emergence of reproductive strategies. More precisely, the objectives are to 1) Analyse environmental predictability in three blue tit populations and its changes through time, 2) Examine the relation between environmental predictability and long-term reproductive strategies (bet-hedging vs. plasticity), 3) Investigate the link between those long-term reproductive strategies, personality syndromes and fitness.

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