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Göteborgs universitets publikationer

Density-Dependent Compensatory Growth in Brown Trout (Salmo trutta) in Nature

Författare och institution:
L. Fredrik Sundström (Institutionen för biologi och miljövetenskap); Rasmus Kaspersson (Institutionen för biologi och miljövetenskap); Joacim Näslund (Institutionen för biologi och miljövetenskap); Jörgen Johnsson (Institutionen för biologi och miljövetenskap)
Publicerad i:
Plos One, 8 ( 5 ) s. artikel nr e63287
Artikel, refereegranskad vetenskaplig
Fulltextlänk (lokalt arkiv):
Sammanfattning (abstract):
Density-dependence is a major ecological mechanism that is known to limit individual growth. To examine if compensatory growth (unusually rapid growth following a period of imposed slow growth) in nature is density-dependent, one-year-old brown trout (Salmo trutta L.) were first starved in the laboratory, and then released back into their natural stream, either at natural or at experimentally increased population density. The experimental trout were captured three times over a one-year period. We found no differences in growth, within the first month after release (May-June), between the starved fish and the control group (i.e. no evidence of compensation). During the summer however (July-September), the starved fish grew more than the control group (i.e. compensation), and the starved fish released into the stream at a higher density, grew less than those released at a natural density, both in terms of weight and length (i.e. density-dependent compensation). Over the winter (October-April), there were no effects of either starvation or density on weight and length growth. After the winter, starved fish released at either density had caught up with control fish in body size, but recapture rates (proxy for survival) did not indicate any costs of compensation. Our results suggest that compensatory growth in nature can be density-dependent. Thus, this is the first study to demonstrate the presence of ecological restrictions on the compensatory growth response in free-ranging animals.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper ->
wild sea-trout, oncorhynchus-kisutch, coho salmon, body-size, population, selection, stream, rates, trajectories, temperature
Postens nummer:
Posten skapad:
2013-08-15 11:01
Posten ändrad:
2013-09-05 16:26

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