EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/07/2017 | 9:30 AM - 9:45 AM | THE FALL EMERGENCE OF THE MAYFLY, HEXAGENIA LIMBATA, FROM WESTERN LAKE ERIE | 306C
THE FALL EMERGENCE OF THE MAYFLY, HEXAGENIA LIMBATA, FROM WESTERN LAKE ERIE
The mass emergence of Hexagenia mayflies during June-July from western Lake Erie has been an annual event since the early 1990s, after an absence of over 30 years. Similarly, observations of “stray” adults along the shoreline well past (August and September) this peak emergence period have commonly been reported, although their specific origin remains unknown. In October of 2016, large numbers of Hexagenia limbata adults were observed at Cedar Island Marina along the north shore of Lake Erie equal to about 50% of that seen the previous July, although noticeably smaller than those in July. Nymphs with black-wing pads were collected off the west side of Pelee Island and exuvae were found on the lake’s surface. Size-frequency analysis indicated that eggs began hatching in early August 2016, and nymphs grew rapidly to the size that had black-wing pads in early October. Still many of the emerging adults may have been from eggs that had hatched in October 2015, a population at a very low density in the lake. No such fall emergence was noticed from Lake St. Clair.
- C07 Lentic Ecology
- C03 Invertebrates
- C07 Lentic Ecology & C03 Invertebrates
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Presenters/Authors
Ronald Griffiths
(), Oregon State University, Oregon Hatchery Research Center, Corvallis, OR 97331, ron.griffiths@oregonstate.edu;
ASHA DISCLOSURE:
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Nonfinancial -
Don W Schloesser
(), U.S. Geological Survey, Great Lakes Science Center, dschloesser@usgs.gov;
ASHA DISCLOSURE:
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Nonfinancial -