| Autor: |
Isaak, DanielJ., Hubert, WayneA. |
| Zdroj: |
Transactions of the American Fisheries Society; September 2004, Vol. 133 Issue: 5 p1254-1259, 6p |
| Abstrakt: |
AbstractStream temperature is a fundamental physical factor that affects the distribution and abundance of salmonids, but empirical inconsistencies exist regarding the nature of this relationship in wild populations. We sampled trout populations composed primarily of cutthroat trout Oncorhynchus clarkibut also including brown trout Salmo truttaand brook trout Salvelinus fontinalisat 102 reaches on 24 first- to fourth-order streams across a thermally diverse montane landscape. Curves fit to scatterplots of density and biomass versus mean July–August stream temperatures suggested nonlinear, dome-shaped responses. Peaks occurred near mean stream temperatures of 12°C; x-intercepts were near 3°C and 21°C. We conclude that inconsistencies in previously reported temperature–abundance relationships for wild trout populations may have resulted from sampling only a subset of the thermal environments occupied by a species. Researchers analyzing this relationship should be cognizant of the range of temperatures studied and the expected form of the relationship over that range. |
| Databáze: |
Supplemental Index |
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