2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 11:45 AM - 12:00 PM | THE EFFECTS OF ONTOGENY, DENSITY, AND FLOW ON THE SPATIAL DISTRIBUTION OF LARVAL BLACK FLIES ON A SINGLE BED ELEMENT. | 306C
THE EFFECTS OF ONTOGENY, DENSITY, AND FLOW ON THE SPATIAL DISTRIBUTION OF LARVAL BLACK FLIES ON A SINGLE BED ELEMENT.
Investigation into resource acquisition of organisms with complex life cycles has primarily focused on ontogenetic shifts in feeding niche, and less is known about ontogenetic changes within one life stage. One such group, the black flies (Diptera: Simuliidae) are a widely distributed group, whose benthic, suspension feeding larvae prefer high velocity microhabitats to maximize resource flux. We investigated the individual and integrated effects of ontogenetic stage (larval size), density (individuals vs. aggregations) and flow (both bulk and small spatial variations), on microhabitat optimization on a single bed element for larvae of the black fly Simulium tribulatum. All three factors significantly affected larval responses to fine-scale flow conditions. Late instar larvae were more likely to move to higher flow regions when initially attaching to the experimental bed element in lower flow areas, and both bulk flow velocity and population density modified this behavior. Neonate larvae did not similarly respond to local flow conditions. Understanding these effects will increase both our understanding of and ability to predict population-level distributions of these organisms, and similar filter-feeding macrobenthos that are important for stream ecosystems.
- C03 Invertebrates
- C17 Bioassessment
- C15 Population Ecology & C30 Molecular Ecology
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Presenters/Authors
Christy Violin
(), Saint Joseph’s University, Philadelphia, PA, USA, cviolin@sju.edu;
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Jonathan Fingerut
(), Saint Joseph’s University, Philadelphia, PA, USA, jfingeru@sju.edu;
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David Hart
(), Mitchell Center for Sustainability Solutions, University of Maine, Orono, ME, USA, david.hart@umit.maine.edu;
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James Thomson
(), Monash University, Melbourne, Victoria, Australia, jim.thomson@delwp.vic.gov.au;
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