2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 9:15 AM - 9:30 AM | RESOURCES AND HABITAT INTERACT TO AFFECT MACROINVERTEBRATE COMMUNITIES ACROSS AGRICULTURAL GRADIENTS IN TWO BIOMES. | 250 DE
RESOURCES AND HABITAT INTERACT TO AFFECT MACROINVERTEBRATE COMMUNITIES ACROSS AGRICULTURAL GRADIENTS IN TWO BIOMES.
The intensity of agricultural land use within catchments simplifies macroinvertebrate community structure by homogenizing substrate, degrading water quality, and changing resource availability. How water quality and dispersal barriers from habitat fragmentation and loss of riparian area influence macroinvertebrate communities under varying agricultural land use (e.g., row crop vs. pasture) is less understood. Therefore, we quantified the relative effect of row-crop and pasture on macroinvertebrates using standardized artificial substrate samplers, in 10 Arkansas catchments across a pasture gradient (0-75%) and 10 Michigan catchments across a row-crop gradient (45-88%). We predicted row-crop would result in greater total density, fewer macroinvertebrate taxa, and lower functional diversity relative to pasture due to altered resources. Macroinvertebrate richness increased by 52% across the pasture gradient but decreased by 68% across the row-crop gradient. Taxa composition differed more across pasture than row-crop, likely due to greater variation in percent land cover. Functional groups shifted from filterers to predators with increasing row-crop, but not in the pasture gradient. Overall densities did not change because as predator density increased filterers decreased. Water quality and dispersal limitations may act as stronger filters in pasture influenced streams than row-crop influenced streams.
- Landuse
- Non-point Source
- Water Quality
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Presenters/Authors
Danielle Braund
(), University of Central Arkansas, dbraund1@cub.uca.edu;
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Matt Trentman
(), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;
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Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Sally Entrekin
(), Virginia Tech, sallye@vt.edu;
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