2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 2:00 PM - 2:15 PM | JOINT SPECIES DISTRIBUTION MODELS: BIOTIC INTERACTIONS AND SCALE AFFECT FRESHWATER MUSSEL COMMUNITIES IN EAST TEXAS | 410 A
JOINT SPECIES DISTRIBUTION MODELS: BIOTIC INTERACTIONS AND SCALE AFFECT FRESHWATER MUSSEL COMMUNITIES IN EAST TEXAS
Communities of freshwater mussels (Unionidae) occur in dense, multi-species beds. Recent single-scale models of fundamental niches have focused on abiotic factors determining presence and abundance of unionid species and communities. Few studies have incorporated the effects of interspecific species interactions and scale on the realized niches of unionids. We used Hierarchical Modeling of Species Communities to assess the impact of species interactions, environmental variables, and scale on unionid abundance. We sampled the abundances of 34 unionid species at 165 sites, across five river drainages in East Texas. We found that of the 561 potential species-species interactions, 284 were negative associations, while 277 were positive associations. Interactions varied in magnitude with a majority being weak (n=389), medium (n=146), then strong (n=26). These results suggest that unionid abundance in dense, species-rich beds is controlled by relatively few interspecific interactions. Average unionid response to environmental covariates explained 47% of variation in abundances. Across multiple spatial scales, differences between sites explained an additional 28% of the variance in unionid abundances. These results suggest development of conservation strategies for dense, species-rich communities should incorporate biotic interactions and scale-specific models to effectively manage unionid communities.
- Community
- Biodiversity
- Spatial
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Presenters/Authors
ROBERT A FRANCIS
(), Miami University , francir3@miamioh.edu;
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ASHLEY D WALTERS
(), Miami University, dunithad@miamioh.edu;
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NEIL B FORD
(), University of Texas at Tyler, nford@uttyler.edu;
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DAVID J BERG
(), MIAMI UNIVERSITY, bergdj@miamioh.edu;
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