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Stable isotope-based determinations of the average temperatures experienced by young-of-the-year Svalbard Arctic charr ( Salvelinus alpinus (L.)).
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- Author(s): Godiksen, J. A.; Svenning, M.-A.; Sinnatamby, R. N.; Dempson, J. B.; Borgstrøm, R.; Power, M.
- Source:
Polar Biology; Apr2011, Vol. 34 Issue 4, p591-596, 6p, 2 Graphs, 1 Map- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Mean ambient water temperatures experienced by individual young-of-the-year (YOY) Arctic charr, Salvelinus alpinus (L.), from a Svalbard lake were estimated using measurements of oxygen stable isotopes (δO) derived from fish otoliths. Otolith-derived water temperatures differed significantly from temperatures recorded at the outlet river of the Dieset watercourse but were consistent with temperatures previously recorded in shallow littoral areas of other Svalbard lakes where YOY charr are commonly found. This indicates that fixed-point monitoring does not necessarily represent the temperatures and thermal habitats used by individual fish. Otolith-derived water temperatures were also positively related to fish length-at-capture and otolith size, although much of the variation remained unexplained. Differences among individuals could be related to variability in food availability and food intake as well as variation in the initial fish size at hatching. Implications for subsequent investigations into how YOY charr respond and adapt to future climate change are discussed. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Polar Biology is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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