Changes in abundance of burrowing mayflies in ...

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Title Changes in abundance of burrowing mayflies in Southern Indian Lake: lessons for environmental monitoring
Author(s) Donna J. Giberson, D. M. Rosenberg, A. P. Wiens
Journal Ambio
Date 1991
Volume 20
Issue 3-4
Start page 139
End page 142
Abstract Surveys of benthic invertebrates in subarctic Southern Indian Lake, Manitoba, before and after manipulation of the lake for hydroelectric development, revealed that Hexagenia (Insecta: Ephemeroptera) populations collapsed following the diversion phase. Initial conclusions attributed the collapse to lake manipulation, but intensive life-history studies indicated that the cause was a series of cold years immediately following diversion. A simple model relating air temperature during the open-water season to Hexagenia abundance was successful in predicting burrowing mayfly abundance in the lake. This indicated the significance of temperature in regulating these populations, which are near their northern limits of distribution in Manitoba. The difficulty in discriminating between natural ecosystem variability and anthropogenic effects during the course of an environmental monitoring program is illustrated by this study.

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