2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/22/2018  |   11:00 AM - 11:15 AM   |  THE EFFECT OF WHOLE STREAM WARMING ON INVERTEBRATE DRIFT IN ARCTIC STREAMS   |  410 A

THE EFFECT OF WHOLE STREAM WARMING ON INVERTEBRATE DRIFT IN ARCTIC STREAMS

To predict responses to stream water warming, we studied insect drift in a upper reach (5.8°C) and a heated up lower reach (9.1°C) of a spring-fed stream and an adjacent warm stream (19-22°C) in a the geothermal area in Hengill volcano, Iceland. Chironomidae larvae dominated the drift in the unheated and heated reaches, being 10 times higher than the second abundant group, Simulium vittatum. Radix balthica (Gastropod) dominated the drift in the warm stream. Density of drifting insects fluctuated in the unheated reach of the streams, but it was stable in the heated reach and the warm stream. Drift density was similar in both reaches, but lower in the warm stream. There was no or little association between the drift of pupae and adults and emergence. Drifting Chironomidae larvae peaked in late June, late July and late August in the cold reach, and in the warm stream in early August. No such peaks were observed in the warmed up reach. Warming up stream water by 3.3°C did not alter invertebrate drift densities. Differences could be related to cover of algae and mosses in the warm-up reach and stream stream.

  • Invertebrate
  • Movement
  • Temperature

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Presenters/Authors

Gisli Mar Gislason (), University of Iceland, gmg@hi.is;


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Aron Dalin Jonasson (), The National University Hospital of Iceland, arondalin@gmail.com;


ASHA DISCLOSURE:

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Nonfinancial -