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 | META-ANALYSIS OF FRESHWATER POSITIVE INTERACTIONS REVEALS THE ROLE OF COMMON PARTICIPANTS, INVASIVE SPECIES, AND STRESS | Virtual Platform

META-ANALYSIS OF FRESHWATER POSITIVE INTERACTIONS REVEALS THE ROLE OF COMMON PARTICIPANTS, INVASIVE SPECIES, AND STRESS

Positive interactions between organisms impact populations, communities, and ecosystems. Appreciation of positive interactions, especially in marine and terrestrial ecosystems, has contributed to fundamental concepts such as the stress gradient hypothesis and niche construction. In freshwater ecosystems, however, it is not well understood how strong the roles of positive interactions are. We used meta-analysis to evaluate how positive interactions are studied in freshwater ecosystems by quantifying outcomes from 106 publications containing 340 total studies. The research was conducted in 26 countries on four continents. Research was most commonly conducted in lotic habitats and with mollusks as the facilitator. Positive associations stemmed from two primary mechanisms, habitat modification and resource augmentation, and habitat modification has stronger positive effects. Invasive facilitators had stronger positive effects on their beneficiaries than native facilitators. We found no evidence of stronger positive interactions in high stress treatments. Avenues for future research include understudied organisms, expanding studies investigating stress gradients, comparing the relative strength of positive interactions to negative ones, and developing hypotheses for how changes to positive interaction networks associated with the loss of key species or introduction of new species could have consequences for freshwater ecosystems.

Mutualism
Stressor
Engineer

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Presenters/Authors

Lindsey Albertson (), Montana State University , lindsey.albertson@montana.edu;