Repeatable inter‐individual variation in the thermal sensitivity of metabolic rate - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Oikos Année : 2019

Repeatable inter‐individual variation in the thermal sensitivity of metabolic rate

Résumé

Assessing whether trait variations among individuals are consistent over time and among environmental conditions is crucial to understand evolutionary responses to new selective pressures such as climate change. According to the universal thermal dependence hypothesis, thermal sensitivity of metabolic rate should not vary strongly and consistently among organisms, implying limited evolutionary response for metabolic traits under climate change. However, this hypothesis has been rarely tested at an individual level, leaving a gap in our understanding of climate change impacts on metabolic responses and their potential evolution. Using the amphipod Gammarus fossarum, we investigated the variability and repeatability of individual metabolic thermal reaction norms over time. We found large variations in both the thermal sensitivity (i.e. slope) and expression level (i.e. intercept) of individual metabolic reaction norms. Moreover, differences among individuals were consistent over time, and therefore repeatable. Inter-individual variations in body mass resulted in a high repeatability of metabolic expression level but had no significant effect on the repeatability of thermal sensitivity. Overall, our results highlight that inter-individual variability and repeatability of thermal reaction norms can be substantial. We conclude that these consistent differences among individuals should not be overlooked when apprehending the ecological and evolutionary effects of climate change.
Fichier principal
Vignette du fichier
Reveillon_24608.pdf (1 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02345454 , version 1 (04-11-2019)

Identifiants

Citer

Tom Réveillon, Thibaut Rota, Eric Chauvet, Antoine Lecerf, Arnaud Sentis. Repeatable inter‐individual variation in the thermal sensitivity of metabolic rate. Oikos, 2019, 128 (11), pp.1633-1640. ⟨10.1111/oik.06392⟩. ⟨hal-02345454⟩
46 Consultations
68 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More