Using Bioenergetics Modeling to Estimate Consumption of Native Juvenile Salmonids by Nonnative Northern Pike in the Upper Flathead River System, Montana
| Autor: | Brian Marotz, Matthew C. Boyer, Clint C. Muhlfeld, R. Kirk Steinhorst, David H. Bennett |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
education.field_of_study
Ecology biology Population Management Monitoring Policy and Law Aquatic Science biology.organism_classification Predation Fishery Trout Salvelinus confluentus Oncorhynchus Flathead education computer Ecology Evolution Behavior and Systematics Esox Pike computer.programming_language |
| Zdroj: | North American Journal of Fisheries Management. 28:636-648 |
| ISSN: | 1548-8675 0275-5947 |
| Popis: | Introductions of nonnative northern pike Esox lucius have created recreational fisheries in many waters in the United States and Canada, yet many studies have shown that introduced northern pike may alter the composition and structure of fish communities through predation. We estimated the abundance of nonnative northern pike (2002–2003) and applied food habits data (1999–2003) to estimate their annual consumption of native bull trout Salvelinus confluentus and westslope cutthroat trout Oncorhynchus clarkii lewisi juveniles in the upper Flathead River system, Montana. Population estimates were generally consistent among years and ranged from 1,200 to 1,300 individuals. Westslope cutthroat trout were present in the diet of younger (≤600 mm) and older (>600 mm) northern pike during all seasons and bull trout were found only in larger northern pike during all seasons but summer. Bioenergetics modeling estimated that the northern pike population annually consumed a total of 8.0 metric tons (mt) of fi... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text