2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 8:30 AM - 10:30 AM | RECOLONIZATION PATHWAYS OF MACROINVERTEBRATE COMMUNITIES IN INTERMITTENT STREAMS: DOES ISOLATION MATTER? | Virtual Platform
RECOLONIZATION PATHWAYS OF MACROINVERTEBRATE COMMUNITIES IN INTERMITTENT STREAMS: DOES ISOLATION MATTER?
Biota in intermittent streams respond to seasonal drying via a wide range of resistance and resilience strategies. Despite early attempts to quantify the relative influence of different recolonization pathways in streams (storage effects, aerial dispersal, and upstream/downstream aquatic dispersal; Williams and Hynes 1976), the importance of spatial context remains untested. Here, we designed a replicated dispersal experiment along an intermittent stream to examine how habitat connectivity (i.e., distance from an upstream perennial reach) affected the importance of invertebrate recolonization pathways upon rewetting. To this end, we built mesh traps that prevented recolonization via all pathways except for one, and placed them at the end of the dry phase in Chalone Creek, Pinnacles National Park. Drift samples were collected daily after flow resumption, and the resulting benthic communities were compared—across trap types, and over space. Preliminary results highlight the importance of storage effects (i.e., persistence in the hyporheic). This study will help quantify the relative importance of resistance and resilience mechanisms in sustaining macroinvertebrate populations. As climate-driven droughts impact flow intermittency globally, a greater understanding of how organisms persist through drying events is key to strengthen conservation efforts.
- Dry rivers
- Non-perennial rivers
- Movement
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Presenters/Authors
Robert Fournier
(), University of California, Berkeley, robertfournier@berkeley.edu;
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Guillermo de Mendoza
(), Institute of Geography, Faculty of Oceanography and Geography, University of Gdansk, gdemendoza.eco@gmail.com;
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Romain Sarremejane
(), INRAE, romain.sarremejane@gmail.com;
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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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