2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 9:00 AM - 9:15 AM | PHENOLOGICAL SHIFT OF CANADA DARNER (AESHNA CANADENSIS) EMERGENCE IN THE ST. CROIX RIVER VALLEY, MINNESOTA | 420 A
PHENOLOGICAL SHIFT OF CANADA DARNER (AESHNA CANADENSIS) EMERGENCE IN THE ST. CROIX RIVER VALLEY, MINNESOTA
Dragonflies are good bioindicators of environmental change and are particularly useful as sentinels of climate change. We conducted a phenological study of Aeshna canadensis (Canada Darner) emergence in three fishless kettle ponds in the St. Croix River Valley, Minnesota. Ponds were sampled three times per week from mid-May through early October, 2017 using methods (emergence traps, rearing cages, emergence screens, and shoreline exuviae hunting) aimed at collecting emerging dragonflies. We documented emergence beginning May 24, peaking the first week of June, and ending July 15. We observed adults flying beginning the last week of August and continuing through the end of our sampling period. Emergence timing of our study population does not align with the observed flight period or with that suggested by published literature. We hypothesize that this species is shifting to an earlier emergence window in response to warming climate. Additionally, we may have detected a migratory population with early-emergers flying elsewhere to reproduce. We are exploring this using hydrogen isotope analysis to detect differences in natal origin of late-flying adults.
- Bioindicators
- Invertebrate
- Temporal
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Presenters/Authors
Holly Kundel
(), University of Minnesota, kunde058@umn.edu;
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Maia Crews-Erjavec
(), Augsburg University, crewsem@augsburg.edu;
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Emily Schilling
(), Augsburg University, schillin@augsburg.edu;
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