Link to USGS home page.
PUBLICATIONS—Water-Resources Investigations Report

Fish Communities and Their Relation to Environmental Factors in the Eastern Iowa Basins in Iowa and Minnesota, 1996

Water-Resources Investigations Report 00-4194

By Danial J. Sullivan

 

U.S. Geological Survey, Iowa City, IA

 

The full report is available in pdf.  Link to the pdf.


Fish community data were collected by the U.S. Geological Survey (USGS) at 12 sites in 1996
in the Wapsipinicon, the Cedar, the Iowa, and the Skunk River Basins in eastern Iowa. The study was done as part of the National Water-Quality Assessment (NAWQA) Program of the USGS. This report presents an evaluation of the fish communities, the composition and conditions of the fish communities,and by relating these compositions and conditions to a variety of habitat and water-quality factors.

A total of 56 fish species representing 13 families were collected from among the 12 sites in 1996. The family with the most species represented were the minnows with 20. The number of individuals of all species collected in one sampling pass ranged from 472 at the Iowa River near Rowan to 2,072 at Wolf Creek near Dysart. Fish community composition was similar among many of the stream sites. The fish community at 4 of the 5 stream sites, as well as at 2 of the large-river sites, was similar to the reference site, the Wapsinicon River near Tripoli, an indication that fish communities across the study unit are similar. The sites that were the least similar to any of the other sites include Flood Creek, a stream site, and the Skunk River at Augusta large-river site. The fish communities at both of these sites were dominated by relatively few species, many of which are tolerant or represent degraded environmental conditions.

Biplots of detrended correspondence analysis ordinations indicate a gradient from the stream sites to the large-river sites. The detrended correspondence analysis ordination also indicates that the stream sites are more closely clustered than the large-river sites. The large-river sites were more likely to have their ordination driven by one or two dominant species, while several species occurred in similar relative abundance at many of the stream sites.

Several indexes of biotic integrity (IBI) based on fish community were applied to the data
and results were generally comparable. In general, the IBIs indicate higher biotic integrity at the stream sites than the large-river sites. Based on IBI classifications, fish communities at most sites were degraded compared to reference conditions. The fish communities at the 12 study sites appear to be related to a number of environmental factors. Obvious differences in fish communities occur between the stream sites and the large-river sites, the result of differences in both physical and chemical characteristics of the streams. Important physical factors related to fish communities included several directly related to stream size as well as human population density and percent of rowcrops in the watershed. Chemical factors that were important included median total phosphorus, suspended-sediment, and dissolved organic carbon concentrations.

 

Contents

Abstract.

Introduction

Background

Description of the study area

Study design and methods

Study design

Data-collection methods

Data-analysis methods

Fish communities of stream sites in Eastern Iowa Basins

Fish community composition

Fish community conditions

Relations between fish community composition and conditions and environmental factors

Summary and conclusions

References cited

 

Suggested citation

Sullivan, D.J., 2000, Fish Communities and their relation to environmental factors in the Eastern Iowa Basins in Iowa and Minnesota, 1996 : U.S. Geological Survey Water-Resources Investigations Report 00-4194, 20 p.

 


AVAILABILITY

The text and graphics are presented here in pdf format (print quality):

The full report is 1.1 MB


   Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 5.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.


U.S. Department of the Interior, U.S. Geological Survey
Persistent URL: http://pubs.water.usgs.gov/wri004194
Page Contact Information: GS Pubs Web Contact
Last modified: Friday, December 02 2005, 09:31:14 AM
FirstGov button  Take Pride in America button