2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 9:45 AM - 10:00 AM | META-COMMUNITY THEORY, DYNAMIC REFERENCE CONDITIONS, AND ASSESSMENTS OF BIODIVERSITY STATUS | 305A
META-COMMUNITY THEORY, DYNAMIC REFERENCE CONDITIONS, AND ASSESSMENTS OF BIODIVERSITY STATUS
O/E indices assess biodiversity status by comparing the degree to which the taxa observed (O) at a site match that expected (E) to occur under reference conditions. E is typically predicted by multitaxon niche models, which implicitly assume that local assemblage composition is wholly determined by habitat suitability. Local biodiversity status is assessed as the degree to which O/E ratios fall outside of index error, which is expressed as the variance in reference-site O/E values. Marked differences in the error of different O/E indices have typically been attributed to differences in sampling completeness and prediction error. However, recent cross-region analyses have shown that the predictability of assemblage composition at reference sites is associated with climate regime, waterbody isolation, and productive capacity. These observations are consistent with meta-community theory, in which the predictability of community assembly is expected to be influenced by both deterministic (niche) and stochastic (dispersal, population dynamics) processes. These observations further illustrate why the reference state must be thought of as a temporally dynamic condition and why region-specific, O/E threshold values are needed to properly infer biodiversity status.
- S27 Advancing Consistency in Ecological Assessments
- C17 Bioassessment
- S21 Practical applications of metacommunity theory in stream and river management
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Presenters/Authors
Charles Hawkins
(), Utah State University, chuck.hawkins@usu.edu;
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