2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:15 AM - 11:30 AM | FLEXIBLE LIFE HISTORY ESSENTIAL FOR THE MAYFLY, HEXAGENIA LIMBATA, TO SURVIVE IN WESTERN LAKE ERIE | 253 AB
FLEXIBLE LIFE HISTORY ESSENTIAL FOR THE MAYFLY, HEXAGENIA LIMBATA, TO SURVIVE IN WESTERN LAKE ERIE
While the mass emergence of Hexagenia mayflies from Lake St. Clair during June & July of each year appears to be a regular event produced by 2 coexisting cohorts that require 22 months to develop from egg to adult, the same mass emergence of Hexagenia mayflies from the western Lake Erie occurs only because of the great flexibility in their life history. Cohorts in western Lake Erie show dramatic declines in abundance over some winters. Eggs laid by those few adults that emerge from August through October (i.e. stays) or during periodic mass fall emergences (2016, 2018) produce individuals that supplement depleted cohorts. Furthermore, individual growth rates significantly increase when one of the cohorts is low in abundance; so much so that individuals are able to reach maturity within one year (hatch in August and emerge the following June). The contribution of “stray” adults during the summer, adults from a fall emergence, and increased growth rates in response to reduced nymph abundance are essential to maintain an annual June-July emergence in the stressful environment of western Lake Erie.
- Invertebrate
- Life History
- Lentic
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Presenters/Authors
Ronald Griffiths
(), Oregon State University, Oregon Hatchery Research Center, Corvallis, OR 97331, ron.griffiths@oregonstate.edu;
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