4.4 Article

Winter Growth, Development, and Emergence of Diamesa mendotae (Diptera: Chironomidae) in Minnesota Streams

期刊

ENVIRONMENTAL ENTOMOLOGY
卷 38, 期 1, 页码 250-259

出版社

OXFORD UNIV PRESS INC
DOI: 10.1603/022.038.0131

关键词

winter active; in situ enclosures; instantaneous growth rate; surface-floating pupal exuviae

资金

  1. University of Minnesota Doctoral Dissertation Fellowship
  2. Bell Museum of Natural History Dayton and Wilkie Grant

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Diamesa mendotae Muttkowski is commonly observed emerging during winter at low air temperatures from Minnesota streams, but little is known about the winter dynamies of this and other winter-emerging aquatic insects. Biweekly collections of surface-floating pupal exuviae indicated that this species emerged from October through May, when water temperatures were less than approximate to 10 degrees C. Emergence occurred continuously through winter, with a lull during January and February. Development of larvae from in situ growth enclosures supported emergence data and indicated that the reduction and halt of emergence in the spring was related to increasing water temperatures (>10 degrees C), which were unsuitable for the growth or survival of the larvae. Development continued through January when water temperatures were at their lowest for the study stream and therefore did not explain the mid-winter lull in emergence. Growth rates of D. mendotae were not greater than other chironomid taxa at similar temperatures, indicating that lower critical thermal limits for growth allow this species to dominate ground-water influenced streams during the winter in Minnesota. The results of this study show that D. mendotae is well suited for growth and development at low temperatures and provides an assessment of important factors that regulate this species at low water and air temperatures.

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