2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 2:00 PM - 2:15 PM | INTERACTIVE EFFECTS OF FLOW REGIME ALTERATION AND PROPAGULE PRESSURE IN DRIVING LARGE-SCALE PATTERNS OF FISH INVASION | 151 G
INTERACTIVE EFFECTS OF FLOW REGIME ALTERATION AND PROPAGULE PRESSURE IN DRIVING LARGE-SCALE PATTERNS OF FISH INVASION
Anticipating how human activities may influence biodiversity replacement across large spatial scales requires understanding the mechanisms behind biological invasions. Both enhanced dispersal (propagule pressure) and flow regime alteration (novel niches) can promote the establishment and spread of non-native species, and ecological theory predicts that these mechanisms could interact locally to induce rapid community disassembly. However, empirical research has largely focused on these mechanisms individually. Here we developed a framework to evaluate how niche opportunities arising from hydrologic alteration, and propagule pressure, jointly control riverine fish invasions across the conterminous United States. Building on extensive biodiversity records and long-term (1987-2016) time-series of streamflow across 1,148 sub-watersheds, we showed that species invasion is highly non-random. Human-induced shifts towards less variable, more seasonal, and more predictable flow regimes have interacted with high levels of propagule pressure to alter the taxonomic and functional composition of fish assemblages. Our results contradict the notion that non-native species patterns are primarily driven by introduction effort—by altering the abiotic template, human activities promote aquatic invasions in complex, yet predictable ways. These findings highlight the potential of coordinated flow strategies to restore biodiversity in running waters.
- Fish
- Hydrology
- Conservation
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Presenters/Authors
Lise Comte
(), University of Washington, lcomte@berkeley.edu;
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Ted Grantham
(), University of California, Berkeley, tgrantham@berkeley.edu;
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Albert Ruhi
(), Department of Environmental Science, Policy, and Management, University of California Berkeley, albert.ruhi@berkeley.edu;
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