%0 Journal Article
%T Life cycles of Eukiefferiella claripennis (Lundbeck 1898) and Eukiefferiella minor (Edwards 1929) (Diptera: Chironomidae) in spring-fed streams of different temperatures with reference to climate change
%A El¨Şsabet Ragna Hannesd¨®ttir
%A G¨Şsli M¨˘r G¨Şslason
%A J¨®n S ¨®lafsson
%J Fauna Norvegica
%D 2012
%I Norwegian University of Science and Technology
%R 10.5324/fn.v31i0.1367
%X The effect of temperature on the life cycles of two chironomid species, Eukiefferiella claripennis and Eukiefferiella minor, was studied by comparing populations from seven spring-fed streams, ranging in annual average temperatures between 5.4ˇăC and 21.3ˇăC. Dependent on stream, both species showed differences in their life cycles: E. claripennis was regarded univoltine in the two coldest streams, IS7 (annual average 5.4ˇăC) and IS11 (5.3ˇăC), and bivoltine or multivoltine in the warmer streams (ranging from 9.7ˇăC to 21.3ˇăC). E. claripennis developed and grew slower in the colder streams compared to the warmer ones. The winter generation in the warmer streams took longer time to complete compared to the summer generation. E. minor was bivoltine in all the streams, with no emergence during the winter in the colder streams, but in one of the warmer streams (IS6, 13.3ˇăC) emergence was continuous throughout the year. In four streams (IS7, cold; IS6, IS5 and IS1, warm) E. minor may even have been multivoltine. There was no trend between the number of generations completed in one year and stream temperature for E. minor. The summer generation of E. minor in the cold stream IS7 produced smaller larvae compared to the winter generation. Following global warming the life cycle of E. claripennis is expected to change from univoltine to bivoltine, and could show changes in emergence pattern. E. minor on the other hand, will likely show less change in its life cycle. Changes in emergence pattern of E. minor could though be possible. doi: 10.5324/fn.v31i0.1367. Published online: 17 October 2012.
%K Chironomidae
%K ecology
%U http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1367