Evaluation of general response patterns as a diagnostic tool to determining contaminant impacts on fish populations
Conference
·
OSTI ID:201204
- Oak Ridge National Lab., TN (United States). Environmental Sciences Division
Five General Response Patterns by fish populations exposed to stress were hypothesized by P. Colby and K. Munkittrick and D. Dixon. The authors used an individual based model of walleye and yellow perch configured for Oneida Lake, NY to test the generality of these patterns. They compared the yellow perch population responses in mean age, size at age, fraction mature at age, individual fecundity and density under 5 stress conditions. The stresses imposed were: (1) adults mortality; (2) eggs mortality (3) metabolic impacts on juveniles; (4) indirect effects from predator level -- increased predator mortality; (5) indirect effects form prey level -- reduced carrying capacity. Modeled yellow perch responses different from the responses hypothesized by Colby/Munkittrick and Dixon. Their analysis shows that the strength of predator-prey coupling must be considered when using patterns of growth, mortality and reproduction to infer the identity of stressors influencing fish populations.
- OSTI ID:
- 201204
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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