2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:00 AM - 11:15 AM | HOW MUCH TOTAL VARIATION IN COMMUNITY COMPOSITION CAN WE REALLY ACCOUNT FOR? A CASE FOR FURTHER INVESTIGATION OF STOCHASTIC EFFECTS | 251 DE
HOW MUCH TOTAL VARIATION IN COMMUNITY COMPOSITION CAN WE REALLY ACCOUNT FOR? A CASE FOR FURTHER INVESTIGATION OF STOCHASTIC EFFECTS
The relative importance of deterministic forces versus chance is one of the most important questions in ecology. Variance partitioning has been used to estimate the relative importance of species sorting (deterministic) versus dispersal limitations (chance) in determining the variation in the community composition among sites. Previous reviews indicate that both sorting and dispersal limitations explain part of the variation in community composition. We reviewed 186 variance-partitioning articles (55% freshwater studies, 43% terrestrial studies, 2% marine) to determine the total explained variation in community composition among sites, which is partitioned into sorting and dispersal limitations. The total explained variation averaged across all studies was 30.7% (± 19.2%) with 26.5% (± 18.4%) in freshwater environments. Since variance-partitioning accounts for so little variation in community composition, we conclude that any attempt to draw inferences on the relative importance of sorting versus dispersal limitations are futile. We refute the explanation that some unmeasured environmental factor(s) account for the remaining 73.5% of unexplained variation in community composition. We also summarize hypotheses on how stochastic effects on community assembly may comprise a substantial portion of unexplained variation in community composition.
- Connectivity
- Dispersal
- Management
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Presenters/Authors
Kevin Lamb
(), Brigham Young University, kvieiralamb@gmail.com;
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Russell Rader
(), Brigham Young University, russell_rader@byu.edu;
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