EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/26/2021 | 8:30 AM - 10:30 AM | WHAT TO DO IF STREAMS GO DRY? BEHAVIOUR OF BALKAN GOLDENRING (CORDULEGASTER HEROS, ODONATA) LARVAE IN A SIMULATED DROUGHT EXPERIMENT IN SW HUNGARY | Virtual Platform
WHAT TO DO IF STREAMS GO DRY? BEHAVIOUR OF BALKAN GOLDENRING (CORDULEGASTER HEROS, ODONATA) LARVAE IN A SIMULATED DROUGHT EXPERIMENT IN SW HUNGARY
There is no information on the desiccation resistance strategies for any members of the stream dwelling dragonfly genus, Cordulegaster, including Cordulegaster heros. Because the hyporheic zone is one of the most important refugia in case of dryings, we hypothesized that the larvae use burrowing behaviour to survive. In this three-week-long simulated drought experiment, we recorded larval survival rates, and tested the effects of sediment particle size and the body size of larvae on burrowing behaviour. Eighty (sixty drought treated and twenty control) larvae were involved in the experiment. Larvae were put into flowing water, into separate special compartments; one day later the flow was ceased and then the water level was gradually decreased. Approximately 15% of larvae could survive the three weeks of drying. The survival probability of drought treated larvae was significantly increased if animals burrowed into the sediment. The survival probability was higher in case of fine sediment. Size of the larvae only affected the depth of the burrowing. However, two thirds of the larvae did not dig into the sediment, which implies that surviving via burrowing is not the only mechanism of the species for withstanding droughts.
- Climate change
- Conservation
- Stream
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Presenters/Authors
Bálint Pernecker
(), University of Pécs, Department of Hydrobiology, balintpernecker@gmail.com;
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Zoltán Csabai
(), University of Pécs, Department of Hydrobiology, csabai@gamma.ttk.pte.hu;
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Nonfinancial -