2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | USE OF THE DEHLI INDEX TO CHARACTERISE MACROINVERTEBRATE COMMUNITY RESPONSES TO DRYING IN MULTIPLE RIVER TYPES | Virtual Platform

USE OF THE DEHLI INDEX TO CHARACTERISE MACROINVERTEBRATE COMMUNITY RESPONSES TO DRYING IN MULTIPLE RIVER TYPES

Temporary rivers are characterised by flow cessation, and thus shift between lotic, lentic and dry habitat phases that are spatio-temporally dynamic. Even though temporary rivers support high biodiversity, they are still often overlooked in biomonitoring programmes and need better protection. Temporary rivers in temperate regions require adapted metrics to evaluate the drought effects on macroinvertebrates communities. The Drought Effect of Habitat Loss on Invertebrates (DEHLI) index was developed to assess the effect of drying on macroinvertebrates by giving taxa numeric values that reflect their ability to survive and their association with a key habitat drying stage in a river. The DEHLI index has shown to effectively characterize macroinvertebrate community responses to drying but has been tested so far on a narrow range of river types in England. We are using a 5-year dataset comprising seasonal macroinvertebrate community samples, river types (i.e. altitude, catchment size, geology) and daily discharge for 76 sites across England to investigate the DEHLI index application across multiple rivers typologies. Mixed-effects models will be used to disentangle the effects of flow intermittence and river typology on the ability of DEHLI to quantify drought effects on macroinvertebrates communities.

Dry rivers
Biodiversity
Habitat

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Presenters/Authors

Mélanie Milin (), University of Huddersfield, melanie.milin@hud.ac.uk;