Energy content and fecundity of capelin (<Emphasis Type="Italic">Mallotus villosus</Emphasis>) along a 1,500-km latitudinal gradient |
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Authors: | R Hedeholm P Grønkjær S Rysgaard |
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Institution: | 1.Marine Ecology, Department of Biological Sciences,Aarhus University,?rhus C,Denmark;2.Greenland Climate Research Centre, c/o Greenland Institute of Natural Resources,Nuuk,Greenland;3.Greenland Institute of Natural Resources,Nuuk,Greenland |
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Abstract: | Capelin is a planktivorous key fish species in many subarctic ecosystems representing the link between lower trophic levels
and apex predators. Little is known, however, of capelin in Greenland waters, but it has been suggested that size and growth
increases due to difference in food availability and temperature conditions along a 1,500 km south–north gradient on the west
coast. It is presently unknown how the qualitative state of capelin energy content is affected along this gradient. Based
on 2007 and 2008 samples, we show that energy content increases with capelin length in both spawning and non-spawning fish
and that it varies with latitude in spawning fish along West Greenland (60–71°N). Combining our results on energy content
with information on capelin growth along the same latitudinal climate gradient demonstrates that less and lower-quality food
is available to capelin predators in the south than in the north. |
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