2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/07/2017 | 9:45 AM - 10:00 AM | HEXAGENIA SPP. IN WESTERN LAKE ERIE OF THE GREAT LAKES-- COMEBACK AND REVIEW OF A SENTINEL TAXON? | 306C
HEXAGENIA SPP. IN WESTERN LAKE ERIE OF THE GREAT LAKES-- COMEBACK AND REVIEW OF A SENTINEL TAXON?
In the mid 1950s, mayfly nymphs disappeared from western Lake Erie and many areas of the Great Lakes. In 1993, after 40 years of absence, mayflies returned to western Lake Erie and there has been a sustained presence of mayflies for the past 25 years. However, densities fluctuated dramatically with a 'boom-and-bust' cycle ever 3-4 years. As a result, a hypothesis was developed that mayflies were exhibiting a density-dependent relationship. This possible relationship was contradictory to the explanation for the absence of mayflies between the mid-1950s and mid-1990s (i.e., eutrophication). Several studies examined the hypothesis of density dependency and found there is evidence the abundance of mayflies interacts with 'residual' pollution to create anoxic conditions determining densities of mayflies in western Lake Erie. As waters of Lake Erie are restored, the density-dependent hypothesis may become more important in interpretation of meaningful endpoints for this taxon used in management-restoration plans for western Lake Erie and, possibly, elsewhere in the Great Lakes.
- C16 Restoration Ecology
- C15 Population Ecology
- C07 Lentic Ecology & C03 Invertebrates
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Presenters/Authors
Don W Schloesser
(), U.S. Geological Survey, Great Lakes Science Center, dschloesser@usgs.gov;
ASHA DISCLOSURE:
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Martin A. Stapanian
(), Great Lakes Science Center, mstapanian@usgs.gov;
ASHA DISCLOSURE:
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Nonfinancial -