2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 10:00 AM - 10:15 AM | RAPID SHIFTS IN ICE-OUT DATES IN NEW ENGLAND LAKES: CONSEQUENCES FOR OXYGEN AND TROPHIC STATE | 150 DEF
RAPID SHIFTS IN ICE-OUT DATES IN NEW ENGLAND LAKES: CONSEQUENCES FOR OXYGEN AND TROPHIC STATE
Lake ice-out dates offer an opportunity to see assess the regional impact of global climate change over 200 years of data, and shifts in the timing of this phenology may lead to both abiotic and biotic changes to lake ecosystems. Previous studies have shown lake ice-out dates in New England shifting 9 to 16 days earlier on average between 1800 and 2000. We examined how ice-out dates in 24 New England lakes have shifted over the past 15 years using a polynomial regression and logistic regressions to examine how ice-out date impacted oxygen depletion. For 16 of the lakes, the rate of shift in predicted ice-out date (velocity) increased for the 2000-2015 period. The ice-out velocity increased 39% between the two time periods (0.18 days per year 1975-2000, 0.25 days per year 2000-2015) Controlling for year, a logistic regression showed that oxygen stress was more likely to occur during years with early ice-out presumably due to a longer growing season. Analysis on phosphorus is ongoing, but anoxic conditions could lead to dissolution of previously insoluble phosphorus, thereby contributing to eutrophication.
- Lentic
- Modeling
- Eutrophication
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Presenters/Authors
William G. McDowell
(), Merrimack College, wgmcdowell@gmail.com;
ASHA DISCLOSURE:
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Nonfinancial -
Alyssa Kullberg
(), EcoMinga Foundation, alyssa.kullberg@gmail.com;
ASHA DISCLOSURE:
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Nonfinancial -