Record Display for the EPA National Library Catalog


Main Title Stochasticity in Stream Fish Communities: An Alternative Interpretation.
Author Yant, P. R. ; Karr, J. R. ; Angermeier, P. L. ;
CORP Author Illinois Univ. at Urbana-Champaign. Dept. of Ecology, Ethology and Evolution.;Corvallis Environmental Research Lab., OR.
Year Published 1984
Report Number EPA/600/J-84/369;
Stock Number PB86-175361
Additional Subjects Populations ; Fishes ; Streams ; Sampling ; Concepts ; Ecological succession ; Stochastic processes ; Abundance ; Seasonal variations ; Variability ; Conflicts ; Indiana ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB86-175361 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
Grossman argued that communities can be classified as either deterministic or stochastic. Deterministic communities are characterized by persistence (or succession toward a climax) while communities that lack these properties are stochastic. These descriptors were intended to replace the terms equilibrium and nonequilibrium, respectively. Grossman et al.(1982) used this conceptual framework to examine fish collections taken over a 12 yr. period from one stream site in Indiana. They defined community persistence as significant correlation in ranked abundances of 10 seasonally most abundant species, measured with Kendall's coefficient of concordance. Because this test showed no significant similarity among autumn samples, they concluded that this community was not persistent and that 'this assemblage is probably regulated by stochastic factors'. The authors disagree with this conclusion. In choices of study site, sample method, replication, emphasized season, and analytical approach, they believe Grossman et al. took options most likely to show variability. (Copyright (c) 1984 by the University of Chicago).