2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 9:15 AM - 9:30 AM | ENVIRONMENTAL REGULATION OF RIVERINE DRAGONFLY (ODONATA) EMERGENCE FROM WISCONSIN RIVERS | 330 A
ENVIRONMENTAL REGULATION OF RIVERINE DRAGONFLY (ODONATA) EMERGENCE FROM WISCONSIN RIVERS
Testing linkages between the occurrence of dragonflies to terrestrial and aquatic variables at multiple scales can improve the efficacy of their use as bioindicators and protect threatened species. Dragonflies have long periods of larval development to integrate environmental conditions, conspicuous synchronous emergence events, and sensitivity to environmental perturbation. Furthermore, several dragonfly species are considered rare or protected in parts of their range necessitating an analysis of habitat suitability. Therefore, we examine patterns in emergence in response to environmental variables at multiple spatial and temporal scales to provide critical information about river ecosystem integrity. Using non-lethal exuviae sampling, dragonfly assemblages were assessed during peak emergence in May-June from two rivers in 2015 and an additional seven rivers in 2016-2017.We obtained over 2,000 exuviae each season including specimens from WI state endangered species. We assessed riparian and hydrologic environmental variables at the scale of individuals, sites, and watersheds. We observed significant differences among sites at the watershed scale (x2=102.33, p <0.05). This study will help to identify the environmental features that need to be maintained to protect endangered species of dragonflies and their habitat as well as improve riverine biotic integrity assessments.
- Landuse
- Biodiversity
- Watershed
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Presenters/Authors
Danielle Tesar
(), University of South Dakota, tesar.danielle@gmail.com;
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Jessica Orlofske
(), University of Wisconsin-Parkside, orlofske@uwp.edu;
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