Lieu: Brunoy

Abstract: In the context of global and increasing frequency of unpredictable climate events, there is increasing interest in how well physiological flexibility can buffer organisms from environmental hazards. Many small mammals and birds have developed specific mechanisms of energy saving, achieved by active and controlled reduction of metabolic rate and hence body temperature, i.e. daily torpor and hibernation. Despite two centuries of research on torpor, physiological mechanisms that regulate this overwintering strategy are still poorly understood. Further, beyond the simple conservation of energy, other implications of torpor have emerged over the last two decades. In this talk, I will share some of the recent findings on the underlying mechanisms of torpor, considering the roles of polyunsaturated fatty acids in its regulation across at least three hibernators. I will also consider further functions and implications of torpor, notably in terms of support for growth and fattening, and its relation to some fitness components.