2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 9:45 AM - 10:00 AM | LOCAL AND REGIONAL DRIVERS OF TAXONOMIC HOMOGENIZATION IN STREAM DIATOMS, INSECTS, AND FISH ALONG A LAND USE GRADIENT | 251 AB

LOCAL AND REGIONAL DRIVERS OF TAXONOMIC HOMOGENIZATION IN STREAM DIATOMS, INSECTS, AND FISH ALONG A LAND USE GRADIENT

We used diatom, insect, and fish datasets from the US, Canada, and France to explore i) responses of beta-diversity to agriculture versus forest cover with respect to physicochemistry, ii) whether these responses were explained by altered local assembly versus regional species pool effects, and iii) if changes in local assembly were explained by the regional species abundance distribution (SAD) or intraspecific spatial aggregation. Agricultural eutrophication was associated with homogenization and greater inequality of the SAD across all groups, but the responses of beta- and gamma-diversity diverged across, and at times within, taxa. The contributions of local assembly versus the regional pool to beta-diversity remained generally insensitive to land use, but varied among groups with fish being more strongly controlled by local effects compared to diatoms and insects. Local assembly was attributed primarily to the regional SADs regardless of land cover, taxonomy, or dataset of origin. We conclude that agricultural eutrophication underlies beta-diversity loss in our streams, but not the relative importance of its local versus regional drivers. Body size and dispersal capacity were consistent predictors of the strength of local assembly, which was governed nearly exclusively by the SAD.

Eutrophication
Landuse
Nutrients

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Presenters/Authors

William Budnick (), University of Texas - Arlington, william.budnick@mavs.uta.edu;