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Eyeless mexican cavefish save energy by eliminating the circadian rhythm in metabolism.

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Author

Summary, in English

The eyed surface form and eyeless cave form of the Mexican tetra Astyanax mexicanus experience stark differences in the daily periodicities of light, food and predation, factors which are likely to have a profound influence on metabolism. We measured the metabolic rate of Pachón cave and surface fish at a fixed swimming speed under light/dark and constant dark photoperiods. In constant darkness surface forms exhibited a circadian rhythm in metabolism with an increase in oxygen demand during the subjective daytime, whereas cave forms did not. The lack of circadian rhythm in metabolism leads to a 27% energy savings for Pachón cave fish compared to surface fish when comparing both forms in their natural photoperiods. When surface forms were tested under constant dark conditions they expended 38% more energy than cave forms under equivalent conditions. Elimination of the circadian rhythm in metabolism may be a general feature of animals that live in perpetually dark food-limited environments such as caves or the deep sea.

Publishing year

2014

Language

English

Publication/Series

PLoS ONE

Volume

9

Issue

9

Document type

Journal article

Publisher

Public Library of Science (PLoS)

Topic

  • Zoology

Status

Published

Research group

  • Lund Vision Group

ISBN/ISSN/Other

  • ISSN: 1932-6203