2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 12:00 PM - 12:15 PM | HOW DOES FLOW HOMOGENIZATION CHANGE AQUATIC INVERTEBRATE COMMUNITY STRUCTURE AND FUNCTIONAL TRAIT DIVERSITY? | 310 A
HOW DOES FLOW HOMOGENIZATION CHANGE AQUATIC INVERTEBRATE COMMUNITY STRUCTURE AND FUNCTIONAL TRAIT DIVERSITY?
Flow homogenization by dams threatens riverine ecosystems by removing disturbances, which are important in creating a mosaic of lotic to lentic microhabitats. Implications of habitat simplification from flow homogenization include reducing taxa with an aerial adult stage (available for riparian consumers) and increasing pond-specialist invertebrate taxa with no aerial stage (unavailable for riparian consumers). We examined the effects on aquatic insect communities when natural disturbances are removed by dam flow homogenization (only steady base-flow released). We predicted flow homogenization would decrease aquatic invertebrate species diversity, primarily by allowing beaver to simplify habitats from a mosaic to entirely lentic. We sampled aquatic invertebrates above and below Alamo dam on the Bill Williams River, Arizona, following a series of prescribed flood events (2006-2008) and again after eight years of continuous flow homogenization (2016). NMDS results showed that communities changed after eight years of flow homogenization relative to undammed control sites. However, we also detected a shift in community structure across all sites, possibly due to an increase in beaver activity even in free-flowing control sites. Our data provide a measurement of the ecological deficit incurred from flow homogenization by dams.
- Flow
- Biodiversity
- Trait
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Presenters/Authors
David DuBose
(), Oregon State University, dubosed@oregonstate.edu;
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Laura McMullen
(), Oregon State University, laurabethmcm@gmail.com;
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Jonathan Tonkin
(), University of Canterbury, jonathan.tonkin@canterbury.ac.nz;
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Dave Lytle
(), Oregon State University, lytleda@oregonstate.edu;
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