Density-Dependent Compensatory Growth in Brown Trout Salmo trutta in NatureReportar como inadecuado




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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.



Autor: L. Fredrik Sundström , Rasmus Kaspersson, Joacim Näslund, Jörgen I. Johnsson

Fuente: http://plos.srce.hr/



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