Biological Responses to Contrasting Hydrology in Backwaters of Upper Mississippi River Navigation Pool 25 |
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Authors: | Michael B Flinn S Reid Adams Matt R Whiles James E Garvey |
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Institution: | (1) Department of Zoology and Center for Ecology, Southern Illinois University Carbondale, Carbondale, IL 62901-6501, USA;(2) Present address: University of Vermont, Rubenstein Ecosystem Science Laboratory, Burlington, VT 05401, USA;(3) Present address: Department of Biology, University of Central Arkansas, Conway, AR 72035, USA;(4) Fisheries and Illinois Aquaculture Center, Southern Illinois University Carbondale, Carbondale, IL 62901, USA |
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Abstract: | Water level management in Mississippi River Pool 25 differentially influences off-channel habitats in the mid-pool and lower
pool. Hydrologic models indicate lower pool off-channel habitats dry with greater frequency and duration compared to similar
habitats at mid-pool. We examined the influence of this contrasting hydrology on substrate characteristics, organic matter,
macroinvertebrate, and fish communities in off-channel habitats during 2001–2003. Benthic organic matter standing stocks were
stable in mid-pool habitats but lower pool values were variable because of annual differences in moist-soil vegetation production.
Generally, small-bodied and multivoltine invertebrate taxa had high community biomass and dominated lower pool habitats, whereas
longer-lived and large-bodied taxa were more abundant and had higher community biomass in mid-pool habitats having longer
hydroperiods. Fish communities were dominated by cyprinids in both habitats, and mid-pool habitats tended to be higher in
overall species richness. Unique fish taxa were collected in each pool, with primarily rheophilic forms in mid-pool habitats
and limnophilic forms in lower pool habitats. Results indicate that contrasting hydrology associated with a mid-pool control
point directly and indirectly influences biological communities in off-channel habitats. Further, management regimes that
promote hydrologic diversity in off-channel habitats may enhance biological diversity at larger spatial and temporal scales. |
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Keywords: | Hydrology Aquatic macroinvertebrates Fishes Wetlands Water level management Off-channel habitat Floodplain Organic matter |
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