Density-dependent Survival as a Function of Size in Juvenile Salmonids in Streams
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Citation:Marschall, Elizabeth A.; Crowder, Larry B. "Density-dependent Survival as a Function of Size in Juvenile Salmonids in Streams," Canadian Journal of Fisheries and Aquatic Sciences, v. 52, no. 1, 1995, pp. 136-140.
The bioenergetic mechanism of density-dependent survival in juvenile stream salmonids was modeled using the relationship between density, food availability, and body size for a foodlimited stream system. With a consumption-rate function estimated from laboratory experiments reported in the literature, we developed a function to predict maximum density of stream-resident juvenile salmonids of different sizes. This function can thus predict effective density based on both numbers and sizes of fish. Density predictions from this mechanistic function did not differ from predictions in the literature based on an empirically derived function describing the relationship between minimum territory size and body size in age-O salmonids in streams, but it did suggest a bioenergetic mechanism for these relationships, linking size and consumption rate to the available food. Finally, we proposed a model of per capita survival rate as a function of the numbers and sizes in a cohort of stream-resident juvenile salmonids.
Abstract in English and French
This research was supported by the following agencies: Electric Power Research Institute (EPRI)/Sport Fishing Institute Fellowship in Population Biology (no. 89-02); U.S. Forest Service, Southeastern Station Challenge Cost-Share Agreement (no. 29-547); EPRI COMPMECH Key Species Project on Salmonids (EPRI under contract RP2932-2 (DOE no. ERD87-672) with the U.S. Department of Energy, under contract no. DE-AC05-840R21400 with Martin Marietta Systems Inc.); grant no. NA16RG0492-01 from the Coastal Ocean Program of NOAA and the UNC Sea Grant College Program Project R/SAB-4; the North Carolina Agricultural Research Station; and the Department of Zoology, The Ohio State University.
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