Skip Links

USGS - science for a changing world

Open-File Report 00-247

Fish Community Structure in Relation to Environmental Variables Within the Sacramento River Basin and Implications for the Greater Central Valley, California

By Jason T. May and Larry R. Brown

Abstract

Twenty-two sites in the Sacramento River Basin, California, were sampled from 1996 to 1998 to characterize fish communities and their relation to water quality and habitat quality. The feasibility of developing an Index of Biotic Integrity (IBI) for the study area was assessed by evaluating six fish community metrics, including percentage of native fish, number of native species, percentage of intolerant fish, number of tolerant species, percentage of omnivorous fish, and percentage of fish with external anomalies. Of the 36 taxa of fish captured during the study, only 13 taxa were native to the drainage. Multivariate analyses identified four site groups that were characterized by four species groups. The distributions of fish species were correlated with elevation of a sampling site and substrate size; however, elevation was correlated with a suite of water-quality and habitat variables. Four of the fish community metrics—percentage of native fish, percentage of intolerant fish, number of tolerant species, and percentage of fish with external anomalies—were responsive to environmental quality. In contrast, number of native species and percentage of omnivorous fish were not correlated with environmental quality. Fish communities in the Sacramento River Basin appeared responsive to environmental gradients, and several of the metrics tested reflected these relations. These results suggest that IBI-type indices can be developed for the basin.

For additional information contact:
Director, California Water Science Center
U.S. Geological Survey
6000 J Street, Placer Hall
Sacramento, California 95819
http://ca.water.usgs.gov/

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

May, J.T., and Brown, L.R., 2000, Fish Community Structure in Relation to Environmental Variables Within the Sacramento River Basin and Implications for the Greater Central Valley, California: U.S. Geological Survey Open-File Report 00-247, 20 p.



Contents

Abstract

Introduction

Methods of Study

Fish Community Structure

Relation to Environmental Variables

Implications for the Greater Central Valley

Summary

References Cited


Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/of/2000/247/
Page Contact Information: Contact USGS
Page Last Modified: Wednesday, December 07, 2016, 06:15:41 PM