Walleye Introduction Eliminates Predation Refuge for Adfluvial Cutthroat Trout and Rainbow Trout
| Autor: | Clark F. Johnson, Brett M. Johnson, Jason C. Burckhardt, Travis E. Neebling |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
education.field_of_study Biomass (ecology) biology Ecology 010604 marine biology & hydrobiology Population Aquatic Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Predation Fishery Trout Habitat Oncorhynchus Rainbow trout education Ecology Evolution Behavior and Systematics Salvelinus |
| Zdroj: | Transactions of the American Fisheries Society. 146:252-267 |
| ISSN: | 1548-8659 0002-8487 |
| Popis: | A predation refuge allowed Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri and Rainbow Trout O. mykiss to coexist with Lake Trout Salvelinus namaycush in Buffalo Bill Reservoir, Wyoming. Recently, Walleye Sander vitreus appeared prompting concern about the persistence of Oncorhynchus populations. Study objectives were to (1) understand how environmental conditions have contributed to the coexistence of Lake Trout and Oncorhynchus populations, and (2) determine habitat use, diet, and per capita consumptive demand of Walleyes. While Walleye population expansion is difficult to predict, we compared consumptive demand of Lake Trout to biomass and production of Oncorhynchus populations to evaluate if additional predation demand by Walleyes could be sustained by prey populations. We measured limnological variables and sampled fishes monthly during April–October in 2012 and 2013 to determine habitat use and collect growth and diet samples. Low Secchi depth (1.6 m) and warm (19°C) epilimnetic te... |
| Databáze: | OpenAIRE |
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