Density-dependent Survival as a Function of Size in Juvenile Salmonids in Streams
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Date
1995
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Abstract
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.
Description
Abstract in English and French
Keywords
food-limited stream system, juvenile salmonids, stream salmonids
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.