The trade-off between heat tolerance and metabolic cost drives the bimodal life strategy at the air-water interface


Contact
Hans.Poertner [ at ] awi.de

Abstract

The principle of oxygen and capacity limitation of thermal tolerance in ectotherms suggests that the long-term upper limits of an organism's thermal niche are equivalent to the upper limits of the organism's functional capacity for oxygen provision to tissues. Air-breathing ectotherms show wider thermal tolerances, since they can take advantage of the higher availability of oxygen in air than in water. Bimodal species move from aquatic to aerial media and switch between habitats in response to environmental variations such as cyclical or anomalous temperature fluctuations. Here we tested the prediction that bimodal species cope better with thermal stress than truly aquatic species using the crab Pachygrapsus marmoratus as a model species. When in water, oxygen consumption rates of P. marmoratus acutely rise during warming. Beyond a temperature threshold of 23 °C the crab's aerobic metabolism in air remains lower than in water. In parallel, the haemolymph oxygen partial pressure of submerged animals progressive decreases during warming, while it remains low but constant during emersion. Our results demonstrate the ability of a bimodal breathing ectotherm to extend its thermal tolerance during air-breathing, suggesting that there are temperature-related physiological benefits during the evolution of the bimodal life style.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
41535
DOI 10.1038/srep19158

Cite as
Fusi, M. , Cannicci, S. , Daffonchio, D. , Mostert, B. , Pörtner, H. O. and Giomi, F. (2016): The trade-off between heat tolerance and metabolic cost drives the bimodal life strategy at the air-water interface , Scientific Reports, 6 , p. 19158 . doi: 10.1038/srep19158


Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item