Macroinvertebrate drift density in relation to abiotic factors in the Missouri River |
| |
Authors: | Christopher H Hay Thomas G Franti David B Marx Edward J Peters Larry W Hesse |
| |
Institution: | (1) Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, NE 68583, USA;(2) Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE 68583, USA;(3) School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583, USA;(4) Rivers Corporation, Inc., 88896 552 Ave., Crofton, NE 68730, USA |
| |
Abstract: | Changes in flow management to restore ecosystem health have been proposed as part of many restoration projects for regulated
rivers. However, uncertainty exists about how the biota will respond to flow management changes. The objectives of this study
were to estimate the relative importance of key abiotic predictor variables to aquatic macroinvertebrate drift densities in
the Missouri River and to compare these results among reaches of the river. A multi-year, multi-location database of spring
macroinvertebrate drift net sampling was used to develop relations between drift density and variables representing discharge,
temperature, and turbidity in the Missouri River from Fort Randall Dam, South Dakota to the mouth of the Little Nemaha River,
Nebraska. Multimodel inference using generalized linear mixed models and an information theoretic approach were used to estimate
the relative importance of the predictor variables and the parameters. The results varied by reach. Discharge-related factors
were more important at the upstream end of the study area, and turbidity was more important at the downstream end of the study
area. Water temperature or degree days were also important predictors in the upstream reaches. The results below Gavins Point
Dam suggest that increased macroinvertebrate drift densities are a response to reduced habitat and food availability. The
results identify important variables for drift density that could be used in future experimental studies of flow manipulation
for the Missouri or other large, regulated rivers.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Handling editor: L. Mauricio Bini |
| |
Keywords: | Macroinvertebrates Drift density Discharge Temperature Turbidity Large rivers |
本文献已被 SpringerLink 等数据库收录! |
|