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Historic changes in fish assemblage structure in midwestern nonwadeable rivers

American Midland Naturalist

By:
, , and
DOI: 10.1674/0003-0031-171.1.27

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Abstract

Historical change in fish assemblage structure was evaluated in the mainstems of the Des Moines, Iowa, Cedar, Wapsipinicon, and Maquoketa rivers, in Iowa. Fish occurrence data were compared in each river between historical and recent time periods to characterize temporal changes among 126 species distributions and assess spatiotemporal patterns in faunal similarity. A resampling procedure was used to estimate species occurrences in rivers during each assessment period and changes in species occurrence were summarized. Spatiotemporal shifts in species composition were analyzed at the river and river section scale using cluster analysis, pairwise Jaccard's dissimilarities, and analysis of multivariate beta dispersion. The majority of species exhibited either increases or declines in distribution in all rivers with the exception of several “unknown” or inconclusive trends exhibited by species in the Maquoketa River. Cluster analysis identified temporal patterns of similarity among fish assemblages in the Des Moines, Cedar, and Iowa rivers within the historical and recent assessment period indicating a significant change in species composition. Prominent declines of backwater species with phytophilic spawning strategies contributed to assemblage changes occurring across river systems.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Historic changes in fish assemblage structure in midwestern nonwadeable rivers
Series title:
American Midland Naturalist
DOI:
10.1674/0003-0031-171.1.27
Volume
171
Issue:
1
Year Published:
2014
Language:
English
Publisher:
University of Notre Dame
Contributing office(s):
Idaho Cooperative Fish and Wildlife Research Unit
Description:
27 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Midland Naturalist
First page:
27
Last page:
53
Number of Pages:
27
Country:
United States
State:
Iowa
Other Geospatial:
Cedar River;Des Moines River;Iowa River;Maquoketa River;Wapsipinicon River