Response of aquatic macroinvertebrate density and diversity to wetland management and structure in the Montezuma Wetlands Complex,New York |
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| Authors: | Michael L Schummer Kayla M Eason Tyler J Hodges Edward B Farley Karen R Sime John M Coluccy Douglas C Tozer |
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| Affiliation: | 1. Department of Environmental and Forest Biology, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA;2. Department of Biological Sciences, SUNY Oswego, Oswego, NY 13126, USA;3. Ducks Unlimited, Inc., North Atlantic Field Office, Syracuse, NY 13209, USA;4. Ducks Unlimited, Inc., Great Lakes/Atlantic Regional Office, Dexter, MI 48130, USA;5. Long Point Waterfowl and Wetlands Research Program, Birds Canada, P.O. Box 160 (Courier: 115 Front Road), Port Rowan, Ontario N0E 1M0, Canada;1. U.S. Geological Survey, Great Lakes Science Center, Tunison Laboratory of Aquatic Science, 3075 Gracie Road, Cortland, NY 13045, USA;2. U.S. Geological Survey, New York Cooperative Fish and Wildlife Research Unit, Cornell University, Ithaca, NY 14853, USA;3. SUNY Research Foundation, 3075 Gracie Road, Cortland, NY 13045, USA;1. Department of Physical and Environmental Sciences, University of Toronto, Toronto, Ontario M1C 1A4, Canada;2. Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada;3. Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, OH 43210, United States;1. Water Science and Technology Branch, Environment and Climate Change Canada, 150-123 Main St., Winnipeg, Manitoba R3C 4W2, Canada;2. Dept. of Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;3. Water Science and Technology Branch, Environment and Climate Change Canada, St. Lawrence Centre, 105 McGill St., Montréal, Québec H2Y 2E7, Canada |
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| Abstract: | We investigated how water management and other covariates affected aquatic macroinvertebrate density and diversity of wetlands in the Montezuma Wetlands Complex (MWC) of the Lake Ontario watershed, New York, USA. We conducted aquatic macroinvertebrate sampling during May–July in 2016–2018 to coincide with when juvenile wetland birds require these protein foods. Models that best explained aquatic macroinvertebrate density and taxon richness included water drawdown treatment, water depth, and water drawdown treatment from the prior year. Predicted mean density of aquatic macroinvertebrates was 117.2% greater in partial drawdown than passive wetlands (i.e., wetlands without active water removal) and increased by 516.2% with 15.5–48 cm increase in water depth. Density of aquatic macroinvertebrates also was ≥ 2.6 times greater in wetlands with a full drawdown the year prior. Taxon richness and Shannon Wiener Diversity Index (H′) varied positively with water depth, and there was greater diversity in partial drawdown than passive wetlands. Taxon richness was nearly 2 times greater in areas with full drawdown the year prior than those with partial drawdowns and passive wetlands. Other competing models for H′ also included negative effects of percentage monotypic cattail and invasive plant taxa. These findings are consistent with aquatic macroinvertebrate adaptation to dynamic wetland hydrology, and we recommend that managers actively manipulate hydrology to provide abundant and diverse food resources for birds at managed wetlands in the Great Lakes region. |
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| Keywords: | Aquatic macroinvertebrates Birds Freshwater marsh Hemi-marsh Montezuma Wetlands Complex Wetland management |
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