Whitefish (Coregonus lavaretus) respiration rate governs intra-otolith variation of δ13C values in Lake Annecy

Dufour, Elise, Gerdeaux, Daniel, and Wurster, Christopher M. (2007) Whitefish (Coregonus lavaretus) respiration rate governs intra-otolith variation of δ13C values in Lake Annecy. Canadian Journal of Fisheries and Aquatic Sciences, 64 (12). pp. 1736-1746.

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We generated 10 high-resolution profiles of stable carbon and oxygen isotope values (δ13Coto and δ18Ooto) of sagittal otoliths of whitefish (Coregonus lavaretus) from Lake Annecy (France) to determine the factors that control intra-individual δ13Coto variation. Dominant patterns of intra-otolith variation compared well with seasonal and age-specific respiration modeling. Conversely, intra-otolith variation of δ13C values did not compare well with measured dietary and environmental variation. We infer that the proportion of metabolically sourced carbon (M) is the dominant control on intra-otolith variation. Current models of otolith carbon incorporation provide different estimates of M. Once appropriate fractionation factors among otolith, endolymph, blood, and carbon sources are elucidated, δ13Coto values will reveal energetic, environmental, and dietary information of teleost fish for past and present populations. Used in conjunction with δ18Ooto values, δ13Coto values will be powerful proxies of fish environment, behavior, and evolution.

Item ID: 15656
Item Type: Article (Research - C1)
ISSN: 1205-7533
Date Deposited: 04 Oct 2011 05:50
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060204 Freshwater Ecology @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960505 Ecosystem Assessment and Management of Forest and Woodlands Environments @ 100%
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