A Comparison of Fish-based Classification Schemes for Reference Streams and Rivers in Nebraska
- Thomas Heatherly *abc,
- Ken Bazataa,
- David Schumachera and
- Elbert Traylora
- a Water Quality Division, Nebraska Dep. of Environmental Quality, 1200 “N” St., Suite 400, Lincoln, NE 68509
b School of Natural Resources, Univ. of Nebraska-Lincoln, 3100 Holdrege St., Lincoln, NE 68583
c current address: Departamento de Ecologia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Rio de Janeiro, RJ, 20550, Brazil
Proper assessments of lotic ecosystems depend on our ability to isolate natural differences from anthropogenic disturbances. We examined Nebraska river and stream classification strength, based on fish species, using multiple response permutation procedures for common classification strategies: ecoregions, watersheds, hydrologic-landscape regions, and assemblage structure from cluster analyses. Next, we tested the ecological interpretability of classification schemes using nonmetric multidimensional scaling ordinations and ANOVAs. Finally, we used nonparametric ANOVA to identify environmental predictors of overall fish assemblage structure. Hydrologic-landscape regions had the highest classification strength, but cluster groups had the most ecological interpretability based on the discreteness of the groups in ordination space and on the large number of common species that had different abundances across cluster groups. In addition, presence/absence data provided groups with more classification strength and interpretability than abundance data. Temperature, stream size, total phosphorus concentrations, and the percentage of fine substrates were significantly correlated to nonmetric multidimensional scaling ordinations and to overall fish structure in the multivariate ANOVA models. Cluster analyses using presence/absence were therefore the best classification scheme, and we identified the environmental variables that are likely to be useful for determining whether streams should have similar biotic assemblages. This information will be a valuable guide for separating natural variability in biotic assemblages from anthropogenic influences.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 2014. . Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.