Density-dependent Habitat Selection by Juvenile Atlantic Salmon (Salmo salar) in Experimental Riverine Habitats
We investigated habitat use of Atlantic salmon parr in experimental riverine enclosures made up of pool, riffle, and run habitats over a range of densities to test the implicit assumption in habitat modeling that habitat selection does not change with population density. Results indicated that habitat use changed with population density, with relatively more parr in pools and fewer runs at higher population densities. Temperature influenced parr distribution, with relatively more parr in runs and fewer in riffles and pools at higher habitats. Effects of population density and temperature on use of pool, riffle, and run habitats were often as large as effects of hydromorphological differences among pool, riffle, and run habitats on fish distributions over the range of temperatures and densities observed. Results varied considerably, despite controlled experimental conditions. We concluded that habitat selection by juvenile Atlantic salmon parr may be density dependent and potentially quite variable.
30 Nov -0001
Natural Sciences And Engineering Research Council Of Canada And Canadian Centre For Fisheries Innovations.
Strategic Research Theme
Oceans, Fisheries and Aquaculture