EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 2:30 PM - 2:45 PM | LONG-TERM COMMUNITY RESPONSES TO AND RECOVERY FROM DRYING VARY ACROSS TEMPERATE-CLIMATE STREAMS WITH DIFFERENT FLOW PERMANENCE REGIMES | 151 G
LONG-TERM COMMUNITY RESPONSES TO AND RECOVERY FROM DRYING VARY ACROSS TEMPERATE-CLIMATE STREAMS WITH DIFFERENT FLOW PERMANENCE REGIMES
Most river networks include reaches with perennial flow, near-perennial reaches that dry during drought disturbances, and intermittent reaches that dry seasonally. The frequency, duration and regional extent of drying drive aquatic community composition, though studies combining multiple aspects of drying across streams with different flow regimes remain rare, especially in cool, wet temperate regions. We explored aquatic invertebrate in relation to discharge data at 46 sites over a 25-year period encompassing ‘normal’ and drought years, to assess how hydrological metrics characterizing different aspects of drying affect alpha and beta diversities at sites with different permanence regimes. Alpha diversity decreased with drying duration in the preceding summer and increased with the time since drying, decreasing more steeply and taking longer to recover at near-perennial than intermittent sites. Beta diversity increased with the spatial extent of drying, reflecting increases in environmental heterogeneity among sites. Contrasting community responses to drying at sites with different flow permanence regimes promoted persistence of the regional species pool and thus post-drying recolonization. However, predicted increases in drought duration and frequency may threaten biodiversity if disturbance intensity exceeds community resistance and recovery capacities.
- Intermittency
- Invertebrate
- Spatial
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Presenters/Authors
Romain Sarremejane
(), INRAE, romain.sarremejane@gmail.com;
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Rachel Stubbington
(), Nottingham Trent University, rachel.stubbington@ntu.ac.uk;
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Judy England
(), Environment Agency, judy.england@environment-agency.gov.uk;
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