A Survey of the Macroinvertebrate Fauna, with Special Reference to Chironomidae (Diptera) in the Rivers Laxá and Kráká, Northern Iceland

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Abstract
The macroinvertebrate fauna of the rivers Laxa and Kraka, which are connected to Lake Myvatn, northern Iceland, is listed on the basis of qualitative samples taken in July 1972. Number of species recorded is 63, 54% of which are chironomids, and 11% are oligochaetes. Widely distributed species dominate, but some more or less circumpolar subarctic species are also represented. The differences between the faunal composition in the springfed river Kraka and the river Laxa, which forms the outlet of Lake Myvatn, are discussed. Six species are exclusive to Kraka, probably mainly because summer temperatures are lower there than in Laxa. Seven species are exclusive to Laxa. This is explained by the increased nutrient content there, the river being the outlet of Lake Myvatn.

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