2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 3:15 PM - 3:30 PM | THE INTERPLAY OF FLOW PROCESSES SHAPES AQUATIC INVERTEBRATE DIVERSITY ALONG TEMPORAL SUCCESSIONS IN FLOODPLAIN CHANNELS - A MODELLING APPROACH | 150 DEF
THE INTERPLAY OF FLOW PROCESSES SHAPES AQUATIC INVERTEBRATE DIVERSITY ALONG TEMPORAL SUCCESSIONS IN FLOODPLAIN CHANNELS - A MODELLING APPROACH
The high biotic diversity supported by floodplains is ruled by the interplay of geomorphic and hydrological processes at various time scales, from daily fluctuations to centennial successions. Because understanding such processes is a key question in river restoration, we attempted to model changes in taxonomic richness (TR) and functional diversity (FD, measured as Rao's quadratic entropy incorporating 9 biological traits) in an assemblage of 115 macroinvertebrate taxa along two successional sequences typical for braided channels. Individual models relating the occurrence of taxa to overflow and backflow durations were developed from field measurements in 19 floodplain channels of the Rhone floodplain (France) monitored over 10 years. The models were combined to simulate diversity changes i) along a progressive siltation and disconnection sequence (250 yrs), ii) along a disconnection sequence interrupted by scouring and downstream reconnection (150 yrs). The former led to a 35% reduction in TR and weak fluctuations in FD. The latter led to increase in both TR (x2) and FD (x1.3). Comparing the model outputs with field data, we show our models can reliably predict dynamic patterns of diversity across successional time and inform floodplain conservation and management.
- Floodplain
- Biodiversity
- Modeling
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Presenters/Authors
Marle Pierre
(), University of Geneva, p.marle2225@hotmail.fr;
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