Development of a species-specific fractionation equation for Arctic charr (<Emphasis Type="Italic">Salvelinus alpinus</Emphasis> (L.)): an experimental approach |
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Authors: | Jane A Godiksen Martin-A Svenning J Brian Dempson Maare Marttila Andrea Storm-Suke Michael Power |
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Institution: | 1.Arctic Ecology Department, Polar Environmental Centre,Norwegian Institute for Nature Research (NINA),Troms?,Norway;2.Department of Aquatic BioSciences, Norwegian College of Fishery Science,University of Troms?,Troms?,Norway;3.Fisheries and Oceans Canada, Science Branch,St. John’s,Canada;4.Department of Biology,University of Waterloo,Waterloo,Canada |
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Abstract: | A species-specific fractionation equation for Arctic charr (Salvelinus alpinus (L.)) was developed experimentally for use in ecological studies of temperature-driven phenologies for the species. Juvenile
Arctic charr were reared in controlled conditions at different temperatures (2–14°C), with three replicates of each temperature.
Otoliths from the fish and water samples from the chambers were analysed for oxygen isotope composition and used to estimate
temperature-dependent fractionation equations relating the isotopic ratio to rearing temperature. A linear and a second order
polynomial relationship were estimated and validated using comparable Arctic charr data from another study. Temperatures predicted
using the polynomial equation were not significantly different from recorded experimental temperatures, whereas with the linear
equation there were significant differences between the predicted and measured temperatures. The polynomial equation also
showed the least bias as measured by mean predictive error. Statistical comparisons of the polynomial fractionation equation
to a similarly estimated equation for brook charr (Salvelinus fontinalis (Mitchill)) indicated significant differences. Results imply the need for species-specific fractionation equations, even
for closely related fish. Results further suggest the polynomial form of the fractionation equation will facilitate more accurate
characterisation of water temperatures suitable for use in ecological studies of temperature-driven phenologies of Arctic
charr. |
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