Reproductive Traits of Brown Trout in Two Contrasting Streams of Southeast Minnesota
| Autor: | Douglas J. Dieterman, Thomas S. Walker, Philip A. Cochran, Melissa Konsti |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Ecology biology 010604 marine biology & hydrobiology Interspecific competition STREAMS Management Monitoring Policy and Law Aquatic Science biology.organism_classification Fecundity 010603 evolutionary biology 01 natural sciences Substrate (marine biology) Gonadosomatic Index Trout Brown trout Salmo Ecology Evolution Behavior and Systematics |
| Zdroj: | North American Journal of Fisheries Management. 36:465-476 |
| ISSN: | 1548-8675 0275-5947 |
| Popis: | Brown Trout Salmo trutta are widely distributed fish that display substantial interpopulation variation in fundamental reproductive traits due to differences in local environmental conditions. This wide variation necessitates regional determination of key traits to aid local management efforts. In addition, several populations demonstrate a trade-off between fecundity and egg size, often as a function of growth history in response to environmental conditions. To determine these traits in the Driftless Area of the Upper Midwest, we identified two streams with contrasting environmental conditions and quantified reproductive traits just prior to the fall-spawning period in 2012. Reproductive traits included growth, length- and age-at-maturity, gonadosomatic index, and female fecundity and egg size. Environmental conditions were considered harsher at one site based on warmer water temperatures, more sand substrate, less adult fish cover, and presence of more potential interspecific competitors than at... |
| Databáze: | OpenAIRE |
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