| 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. |
| Genre: | Article |
| ProdID: | 70023323 |
| Citation Author: | Petersen, J. H. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 1148 |
| Citation Issue: | 4 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Journal of Fish Biology |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 12 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river; 2001; Article; Journal; Journal of Fish Biology; Petersen, J. H. |
| Citation Start Page: | 1137 |
| Citation Volume: | 58 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river; 2001; Article; Journal; Journal of Fish Biology; Petersen, J. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1006/jfbi.2000.1524 |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
| Publisher: | |
