EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2018 | 9:15 AM - 9:30 AM | BIOTIC RESPONSES TO MULTIPLE THREATS OF URBANIZATION AND DRYING IN HEADWATER STREAMS | 310 A
BIOTIC RESPONSES TO MULTIPLE THREATS OF URBANIZATION AND DRYING IN HEADWATER STREAMS
In developing watersheds, biota in headwater streams are not only influenced by land use disturbance, but also by seasonal drying. We were interested in determining the relative importance of hydrologic permanence and urbanization on macroinvertebrate assemblages and salamander densities. We sampled biota in 10 intermittent streams with 11.7–97.1% urban land cover. The spring of 2008 followed an exceptionally dry summer and had significantly lower macroinvertebrate density (1541 m-2) compared to the spring of 2007 (4589 m-2; t = -2.86, p<0.021), but composition was similar among years. Several macroinvertebrate metrics (total richness, EPT richness, % EPT abundance, % Isopoda abundance) were negatively related to % urban land cover, and these relationships held in both years. Few macroinvertebrate metrics were related to hydrologic permanence, suggesting that macroinvertebrates in these temporary habitats have traits enabling their persistence through dry spells. In contrast, densities of the two-lined salamander, Eurycea bislineata, increased with increasing permanence, but were unaffected by urbanization. These results highlight the sensitivity of macroinvertebrates to urbanization of temporary streams, regardless of stream permanence, and emphasize the challenges of managing heterogeneous headwater streams given multiple threats and multiple objectives.
- Intermittent
- Multi-stressors
- Invertebrate
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Presenters/Authors
Allison Roy
(), U.S. Geological Survey, Massachusetts Cooperative Fish and Wildlife Research Unit, University of Massachusetts Amherst, aroy@eco.umass.edu;
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Hannah Lubbers
(), Clermont County Water Resources, hlubbers@co.clermont.oh.us;
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Michael Miller
(), University of California Davis, micmiller@ucdavis.edu ;
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