The Chironomidae of the exposed zone of Øvre Heimdalsvatn

• Published in: Ecography
• Main Author: Aagaard, Kaare
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1978
• Subjects: Ecology, Evolution, Behavior and Systematics; Øvre; Subarctic
• Online Access: http://dx.doi.org/10.1111/j.1600-0587.1978.tb00959.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0587.1978.tb00959.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0587.1978.tb00959.x

A total of 67 species of chironomids were caught in emergence traps placed at the shoreline. Additional larval records increase the number of species to be at least 75, a high number of species possibly explained by the exposed nature of the lake, which also provides habitats for lotic forms. The species composition and relative abundance of the four main groups of Chironomidac indicate that Øvre Heimdalsvatn is a subarctic lake, with a strong oligotrophic character. The emergence period starts in mid‐June and lasts to mid‐September. Diversity studies show similarity with mountain lakes in France and with the Bodensee, but the equilability in Øvre Heimdalsvatn is lower. The chironomid faunal composition of Øvre Heimdalsvatn seems to be determined by abiotic ecological factors and not the history of distribution.