2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 3:15 PM - 3:30 PM | CUMULATIVE EFFECTS OF HEADWATER IMPAIRMENT ON DOWNSTREAM ECOSYSTEMS IN HIGHLY MODIFIED LANDSCAPES | 302A
CUMULATIVE EFFECTS OF HEADWATER IMPAIRMENT ON DOWNSTREAM ECOSYSTEMS IN HIGHLY MODIFIED LANDSCAPES
Headwater streams contribute important materials to downstream habitats including sediment, nutrients, organic matter, and organisms. As the upstream parts of dendritic river networks, they occupy a substantial proportion of total stream length and watershed area. Despite well-established functional linkages between up- and downstream habitats and biota, less research focuses on predicting cumulative effects of headwater impairment. This is particularly important in urbanizing regions since individual headwaters are small and intermittent, may be considered less important than larger streams, and have less legislated protection. In addition, cumulative effects are likely complex and non-linear with thresholds and synergistic interactions occurring across scales. Predicting downstream responses first requires a multiscale understanding of headwater stream variability. We used a spatially extensive dataset of >1000 headwater streams across an urbanization gradient to explore spatial structure of headwater conditions and their relationship to land use. Our analysis revealed predictive capacity is enhanced by incorporating multiple scales, but that type of spatial structure matters (e.g., overland vs. stream distance). Understanding these complex interactions will allow us to predict how headwater impairment cumulatively impacts downstream benthic macroinvertebrate communities.
- C27 Landuse and Non-Point source Impacts
- C22 Disturbance
- C08 Urban Ecology
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Presenters/Authors
Brian Kielstra
(), Department of Forest and Conservation Sciences, University of British Columbia, b.kielstra@alumni.ubc.ca;
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Les Stanfield
(), Ecohealth Solutions, les.stanfield@outlook.com;
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Lenka Kuglerová
(), University of British Columbia, leku0004@mail.ubc.ca;
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John Richardson
(), Department of Forest and Conservation Sciences, University of British Columbia, john.richardson@ubc.ca;
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