2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 11:30 AM - 11:45 AM | DIGGING DEEPER: HOW ALPHA AND BETA DIVERSITIES OF MULTIDIMENSIONAL COMMUNITIES RESPOND TO DRYING IN DYNAMIC RIVERS | 151 G
DIGGING DEEPER: HOW ALPHA AND BETA DIVERSITIES OF MULTIDIMENSIONAL COMMUNITIES RESPOND TO DRYING IN DYNAMIC RIVERS
Drying represents the primary determinant of aquatic biodiversity in temporary rivers. However, research focuses on benthic invertebrates in surface sediments, inadequately representing a connected community that extends into the subsurface. We explored invertebrate responses to longitudinal changes in water permanence in the vertical dimension. We compared benthic and hyporheic responses in terms of assemblage composition, alpha diversity and beta diversity. Contrasting with benthic reductions and despite compositional changes, hyporheic alpha diversity remained stable except at long drying durations, and the hyporheic occurrence of some taxa increased with drying. These results collectively suggest that the hyporheic zone can act as a drying refuge for benthic taxa. Beta diversity increased or remained stable for benthic communities, but remained stable or decreased for their hyporheic counterparts, likely reflecting contrasts in the influence of mass effects and environmental filtering on temporal variability in community composition. We found no evidence of decreasing dissimilarity between benthic and hyporheic communities with decreasing permanence, suggesting hyporheic assemblages as having distinct biodiversity value. As temporary rivers increase in extent due to global change, we highlight that recognizing the vertical dimension can enable holistic understanding of community responses to drying.
- Hyporheic
- Invertebrate
- Disturbance
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Presenters/Authors
Rachel Stubbington
(), Nottingham Trent University, rachel.stubbington@ntu.ac.uk;
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Romain Sarremejane
(), Nottingham Trent University, romain.sarremejane02@ntu.ac.uk;
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Thibault Datry
(), INRAE, France, Thibault.datry@inrae.fr;
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