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Reduction of Energetic Demands through Modification of Body Size and Routine Metabolic Rates in Extremophile Fish

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dc.citation.doi10.1086/681053
dc.citation.epage383
dc.citation.issn1522-2152
dc.citation.issue4
dc.citation.jtitlePhysiological and Biochemical Zoology
dc.citation.spage371
dc.citation.volume88
dc.contributor.authorPassow, C. N.
dc.contributor.authorGreenway, R.
dc.contributor.authorArias-Rodriguez, L.
dc.contributor.authorJeyasingh, P. D.
dc.contributor.authorTobler, Michael
dc.contributor.authoreidtobler
dc.date.accessioned2016-04-04T22:13:47Z
dc.date.available2016-04-04T22:13:47Z
dc.date.published2015
dc.descriptionCitation: Passow, C. N., Greenway, R., Arias-Rodriguez, L., Jeyasingh, P. D., & Tobler, M. (2015). Reduction of Energetic Demands through Modification of Body Size and Routine Metabolic Rates in Extremophile Fish. Physiological and Biochemical Zoology, 88(4), 371-383. doi:10.1086/681053
dc.descriptionVariation in energy availability or maintenance costs in extreme environments can exert selection for efficient energy use, and reductions in organismal energy demand can be achieved in two ways: reducing body mass or metabolic suppression. Whether long-term exposure to extreme environmental conditions drives adaptive shifts in body mass or metabolic rates remains an open question. We studied body size variation and variation in routine metabolic rates in locally adapted populations of extremophile fish (Poecilia mexicana) living in toxic, hydrogen sulfide-rich springs and caves. We quantified size distributions and routine metabolic rates in wild-caught individuals from four habitat types. Compared with ancestral populations in nonsulfidic surface habitats, extremophile populations were characterized by significant reductions in body size. Despite elevated metabolic rates in cave fish, the body size reduction precipitated in significantly reduced energy demands in all extremophile populations. Laboratory experiments on common garden-raised fish indicated that elevated routine metabolic rates in cave fish likely have a genetic basis. The results of this study indicate that adaptation to extreme environments directly impacts energy metabolism, with fish living in cave and sulfide spring environments expending less energy overall during routine metabolism.
dc.description.embargoEmbargo 3/23/2016
dc.identifier.urihttp://hdl.handle.net/2097/32232
dc.relation.urihttps://doi.org/10.1086/681053
dc.rights© 2015 by The University of Chicago
dc.rights.urihttp://www.sherpa.ac.uk/romeo/issn/1522-2152/
dc.subjectAdaptation
dc.subjectCave Environments
dc.subjectEnergy Consumption
dc.subjectExtreme Environments
dc.subjectHydrogen Sulfide Springs
dc.subjectPoecilia Mexicana
dc.titleReduction of Energetic Demands through Modification of Body Size and Routine Metabolic Rates in Extremophile Fish
dc.typeArticle

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