ISSN:
1573-5133
Keywords:
Cottus
;
River continuum
;
Density
;
Growth
;
Fecundity
;
Predation
;
Population regulation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Synopsis Data on spatial variation of sculpin density, growth and fecundity support the hypothesis that populations of stream fish are structured by changes in risk of predation and prey availability along a gradient in stream size. Cottus bairdi in warm streams and C. cognatus in cold streams exhibit similar patterns. Sculpins in large streams have faster individual growth rates and higher fecundities than those in small streams, but occur at lower density. The patterns appear to be persistent and suggest that predation reduces sculpin density in larger streams. Competitive release, variations in prey productivity, and local factors probably contribute to the variation in sculpin growth.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00002577
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