Land use structures fish assemblages in reservoirs of the Tennessee River

被引:2
|
作者
Miranda, L. E. [1 ]
Bies, J. M. [2 ]
Hann, D. A. [2 ]
机构
[1] US Geol Survey, Mississippi Cooperat Fish & Wildlife Res Unit, Mississippi State, MS 39762 USA
[2] Mississippi State Univ, Dept Wildlife Fisheries & Aquaculture, Mississippi State, MS 39762 USA
关键词
GIZZARD SHAD; COMMUNITY STRUCTURE; NUTRIENT; PHYTOPLANKTON; PRODUCTIVITY; TERRESTRIAL; PLANKTIVORE; PHOSPHORUS; DYNAMICS; SIZE;
D O I
10.1071/MF14188
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Inputs of nutrients, sediments and detritus from catchments can promote selected components of reservoir fish assemblages, while hindering others. However, investigations linking these catchment subsidies to fish assemblages have generally focussed on one or a handful of species. Considering this paucity of community-level awareness, we sought to explore the association between land use and fish assemblage composition in reservoirs. To this end, we compared fish assemblages in reservoirs of two sub-basins of the Tennessee River representing differing intensities of agricultural development, and hypothesised that fish assemblage structure indicated by species percentage composition would differ among reservoirs in the two sub-basins. Using multivariate statistical analysis, we documented inter-basin differences in land use, reservoir productivity and fish assemblages, but no differences in reservoir morphometry or water regime. Basins were separated along a gradient of forested and non-forested catchment land cover, which was directly related to total nitrogen, total phosphorous and chlorophyll-a concentrations. Considering the extensive body of knowledge linking land use to aquatic systems, it is reasonable to postulate a hierarchical model in which productivity has direct links to terrestrial inputs, and fish assemblages have direct links to both land use and productivity. We observed a shift from an invertivore-based fish assemblage in forested catchments to a detritivore-based fish assemblage in agricultural catchments that may be a widespread pattern among reservoirs and other aquatic ecosystems.
引用
收藏
页码:526 / 534
页数:9
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