Large-Scale Effects of Timber Harvesting on Stream Systems in the Ouachita Mountains, Arkansas, USA |
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Authors: | Lance R Williams Christopher M Taylor Melvin L Warren Jr J Alan Clingenpeel |
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Institution: | (1) Department of Biological Sciences, Mississippi State University, P.O. Drawer GY, Mississippi State, Mississippi 39762, USA, US;(2) USDA Forest Service, Southern Research Station, 1000 Front Street, Oxford, Mississippi 38655, USA, US;(3) USDA Forest Service, Oùachita National Forest, Box 1270, Federal Building, Hot Springs, Arkansas, 71902, USA, US |
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Abstract: | Using Basin Area Stream Survey (BASS) data from the United States Forest Service, we evaluated how timber harvesting influenced
patterns of variation in physical stream features and regional fish and macroinvertebrate assemblages. Data were collected
for three years (1990–1992) from six hydrologically variable streams in the Ouachita Mountains, Arkansas, USA that were paired
by management regime within three drainage basins. Specifically, we used multivariate techniques to partition variability
in assemblage structure (taxonomic and trophic) that could be explained by timber harvesting, drainage basin differences,
year-to-year variability, and their shared variance components. Most of the variation in fish assemblages was explained by
drainage basin differences, and both basin and year-of-sampling influenced macroinvertebrate assemblages. All three factors
modeled, including interactions between drainage basins and timber harvesting, influenced variability in physical stream features.
Interactions between timber harvesting and drainage basins indicated that differences in physical stream features were important
in determining the effects of logging within a basin. The lack of a logging effect on the biota contradicts predictions for
these small, hydrologically variable streams. We believe this pattern is related to the large scale of this study and the
high levels of natural variability in the streams. Alternatively, there may be time-specific effects we were unable to detect
with our sampling design and analyses. |
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Keywords: | : Fishes Drainage basin Macroinvertebrates Ordination Regional assemblages Scale Timber harvesting Variance partitioning |
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