2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 11:00 AM - 11:15 AM | THE EFFECT OF WHOLE STREAM WARMING ON CHIRONOMID (DIPTERA) COMMUNITY COMPOSITION AND EMERGENCE TIME OF INDIVIDUALS | 306C
THE EFFECT OF WHOLE STREAM WARMING ON CHIRONOMID (DIPTERA) COMMUNITY COMPOSITION AND EMERGENCE TIME OF INDIVIDUALS
To predict responses to stream water warming, we studied insect emergence for two summers in the upper reach of a spring-fed stream (5.8°C) and heated up lower reach (9.1°C) of the same stream. For comparison a warm stream (19-22°C) was studied simultaneously. Density and diversity of emerging insects was greater in the heated reach than the unheated reach, especially during the first summer. Some chironomid species are absent in the heated reach (Orthocladius frigidus, Chaetocladius laminatus, Diamesa aberrata), while other were only present in the heated reach (Rheocricotopus effusus, Paraphaenocladius impensus, O. fuscimanus, Micropsectra atrofasciata). Species found in both reaches had an earlier emergence and/or had more emergence periods in the heated reach (Thienemanniella sp., Eukiefferiella claripennis, E. minor, Parochlus kiefferi), than in the cold reach. Metriocnemus eurynotus was unaffected by the water heating.
Warming up stream water by 3.3°C altered densities and diversity of emerging chironomids, their life histories and species composition.
- C11 Community Ecology
- C29 Life Histories
- C15 Population Ecology & C30 Molecular Ecology
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Presenters/Authors
Gisli Mar Gislason
(), University of Iceland, gmg@hi.is;
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Thora Katrin Hrafnsdottir
(), Natural History Museum of Kopavogur, Iceland, thora@natkop.is;
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Soila Inkeri Susanna Silvonen
(), University of Iceland/University of Helsinki, sis164@hi.is;
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Aron Dalin
(), University of Iceland, adj11@hi.is;
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