期刊
ECOLOGY OF FRESHWATER FISH
卷 24, 期 1, 页码 15-22出版社
WILEY
DOI: 10.1111/eff.12120
关键词
Enclosures; intraspecific competition; population regulation; space limitation; stream salmonids
资金
- Concordia University Faculty of Arts and Science entry scholarship
- Discovery Grant from the Natural Sciences and Engineering Research Council of Canada
- Catamaran Brook Habitat Research Project [124]
Whether territoriality regulates population size depends on the flexibility of territory size, but few studies have quantified territory size over a broad range of densities. While juvenile salmonids in streams exhibit density-dependent mortality and emigration, consistent with space limitation, there has been relatively little study of how territory size and individual growth rate change over a broad range of densities, particularly in field experiments. Consequently, we manipulated the density (range=0.25-8m(-2)) of young-of-the-year (YOY) Atlantic salmon (Salmo salar) in mesh enclosures erected in a natural stream to test whether (i) territory size is fixed, decreases continuously or decreases towards an asymptotic minimum size as density increases; and (ii) individual growth rate decreases as a negative power curve with density as in observational field studies. Territory size decreased with increasing density, consistent with an asymptotic minimum size of about 0.13m(2) for a 5-cm fish. Individual growth rate also decreased with density, although the magnitude of decrease was steeper than in observational studies. Our results suggest a limit to how small territories can be compressed, which will set the upper limit to the local density in a habitat. The density-dependent changes in territory size and individual growth rate will both play a role in the regulation of stream salmonid populations.
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