Streamflow characteristics and benthic invertebrate assemblages in streams across the western United States

Fact Sheet 2010-3110
By: , and 



Hydrographic characteristics of streamflow, such as high-flow pulses, base flow (background discharge between floods), extreme low flows, and floods, significantly influence aquatic organisms. Streamflow can be described in terms of magnitude, timing, duration, frequency, and variation (hydrologic regime). These characteristics have broad effects on ecosystem productivity, habitat structure, and ultimately on resident fish, invertebrate, and algae communities. Increasing human use of limited water resources has modified hydrologic regimes worldwide. Identifying the most ecologically significant hydrographic characteristics would facilitate the development of water-management strategies.

Benthic invertebrates include insects, mollusks (snails and clams), worms, and crustaceans (shrimp) that live on the streambed. Invertebrates play an important role in the food web, consuming other invertebrates and algae and being consumed by fish and birds. Hydrologic alteration associated with land and water use can change the natural hydrologic regime and may affect benthic invertebrate assemblage composition and structure through changes in density of invertebrates or taxa richness (number of different species).

This study examined associations between the hydrologic regime and characteristics of benthic invertebrate assemblages across the western United States and developed tools to identify streamflow characteristics that are likely to affect benthic invertebrate assemblages.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Streamflow characteristics and benthic invertebrate assemblages in streams across the western United States
Series title Fact Sheet
Series number 2010-3110
DOI 10.3133/fs20103110
Year Published 2010
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Utah Water Science Center, Washington Water Science Center
Description 4 p.
Public Comments National Water-Quality Assessment Program
Country United States
Online Only (Y/N) N
Additional Online Files (Y/N) N