Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river
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Abstract
Predation by northern pikeminnow Ptychocheilus oregonensis on juvenile salmonids Oncorhynchus spp. occurred probably during brief feeding bouts since diets were either dominated by salmonids (>80% by weight), or contained other prey types and few salmonids (<5%). In samples where salmonids had been consumed, large rather than small predators were more likely to have captured salmonids. Transects with higher catch-per-unit of effort of predators also had higher incidences of salmonids in predator guts. Predators in two of three reservoir areas were distributed more contagiously if they had preyed recently on salmonids. Spatial and temporal patchiness of salmonid prey may be generating differences in local density, aggregation, and body size of their predators in this large river.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river |
| Series title | Journal of Fish Biology |
| DOI | 10.1006/jfbi.2000.1524 |
| Volume | 58 |
| Issue | 4 |
| Year Published | 2001 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 12 p. |
| First page | 1137 |
| Last page | 1148 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |