EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2018 | 9:45 AM - 10:00 AM | EFFECTS OF LAKE SEDIMENT STRUCTURE ON HEXAGENIA SPP. NYMPHAL DEVELOPMENT | 420 B
EFFECTS OF LAKE SEDIMENT STRUCTURE ON HEXAGENIA SPP. NYMPHAL DEVELOPMENT
Multiple anthropogenic disturbances to the Laurentian Great Lakes have had detrimental effects on benthic habitats and biota including the c1960 extirpation of the environmentally sensitive burrowing mayfly genus, Hexagenia, from Saginaw Bay, Lake Huron. Water quality improvements following remediation efforts, including those inspired by the Great Lakes Water Quality Agreement, haven't facilitated bay Hexagenia recovery as of 2012. Comparisons of bay sediment texture maps suggest suitable Hexagenia habitat has decreased, potentially limiting the species' recovery: while about half of the bay sediment contained >50% sand historically, in 2012 more than three-quarters contained >50% sand. To investigate Hexagenia's ability to develop on sediment with Saginaw Bay texture, ~5mo-old nymphs were reared for 60d at a density of 1/9cm2 on eight experimental sediment treatments (r=5, n=40). Treatments were constructed to contain 28%-98% sand in 10% increments, an approximation of the bay's 2012 sand level range. Nymphal survival, growth(cm), and adult emergence were documented. No significant differences among treatments were found. This suggests the current sediment texture of Saginaw Bay can support Hexagenia development, and thus other factors are responsible for its failure to recover.
- Habitat
- Bioindicators
- Great Lakes
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Presenters/Authors
Heather Siersma
(), Wayne State University, heather.siersma@wayne.edu;
ASHA DISCLOSURE:
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Donna Kashian
(), Wayne State University, dkashian@wayne.edu;
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