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Some Consequences of Size Variability in Juvenile Prickly Sculpin, Cottus asper

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Abstract

Variation in size among fishes can have important ecological consequences. The origin and persistence of variation in size among a cohort of juvenile prickly sculpin, Cottus asper, was explored experimentally by manipulating the size variability in juvenile fish and the presence of conspecific adult fishes in a factorial design. I found that adult fish significantly suppressed the growth and survivorship of juveniles, while the variance treatment alone had no effect on growth or survivorship. The presence of adults was also associated with a decrease in size variability in the high variance treatment. An analysis of juvenile growth patterns revealed no evidence for size dependent growth or temporal correlations in growth (`growth autocorrelation'), and are consistent with a lack of amplification of size variance through time. Juvenile C. asper appear to have been feeding on a relatively homogeneous resource and utilizing those resources similarly. Thus, patterns of individual growth and the presence of adult conspecifics may both serve to dampen size differences in this coastal fish species.

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  1. Department of Ecology and Evolution, University of Chicago, 1101 E. 57th St., Chicago, IL, 60637, U.S.A.

    Catherine A. Pfister

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  1. Catherine A. Pfister
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Pfister, C.A. Some Consequences of Size Variability in Juvenile Prickly Sculpin, Cottus asper . Environmental Biology of Fishes 66, 383–390 (2003). https://doi.org/10.1023/A:1023903004766

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