Thermal strategies vary with life history stage

Author:

Truebano Manuela1ORCID,Fenner Phillip1,Tills Oliver1,Rundle Simon D.1ORCID,Rezende Enrico L.2ORCID

Affiliation:

1. Marine Biology and Ecology Research Centre, Plymouth University, Plymouth PL4 8AA, UK

2. Departamento de Ecología, Center of Applied Ecology and Sustainability, Facultad de Ciencias Biológicas, Universidad Católica de Chile, Santiago 6513677, Chile

Abstract

ABSTRACT With both global surface temperatures and the incidence and intensity of extreme temperature events projected to increase, the assessment of species' sensitivity to chronic and acute changes in temperature has become crucial. Sensitivity predictions are based predominantly on adult responses, despite the fact that early life stages may be more vulnerable to thermal challenge. Here, we compared the sensitivity of different life history stages of the intertidal gastropod Littorina obtusata using thermal death time curves, which incorporate the intensity and duration of heat stress, and used these to calculate upper critical thermal limits (CTmax) and sensitivity to temperature change (z). Early (larval) life stages had both a lower CTmax and a lower z than adults, suggesting they are less good at withstanding short-term extreme thermal challenges but better able to survive moderate temperatures in the long term. This result supports the predicted trade-off between acute and chronic tolerance to thermal stress, and is consistent with the different thermal challenges that these stages encounter in the intertidal zone. We conclude that different life history stages employ different thermal strategies that may be adaptive. Our findings caution against the use of predictions of the impact of global warming that are based on only adult responses and, hence, which may underestimate vulnerability.

Funder

Plymouth University

Fondo Nacional de Desarrollo Científico y Tecnológico

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

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