EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
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5/23/2018 | 10:00 AM - 10:15 AM | LIGHT AND WAVE EXPOSURE DRIVE LITTORAL BENTHIC PRIMARY PRODUCTION IN LAKE ERIE AND GEORGIAN BAY, LAKE HURON | 330 B

LIGHT AND WAVE EXPOSURE DRIVE LITTORAL BENTHIC PRIMARY PRODUCTION IN LAKE ERIE AND GEORGIAN BAY, LAKE HURON

Attached algae can contribute substantially to whole-lake primary production in basins with extensive littoral zones, but algal production on hard substrates is limited by light availability and physical disturbance. Benthic algal productivity is measured infrequently in the Laurentian Great Lakes, but could be substantial in shallow basins, like Western Lake Erie. We measured algal productivity on rocks in Lake Erie (2016 and 2017) and in Lake Huron (2016). Mean productivity varied between 17 and 191 mg C/m2/hr in Lake Erie and ranged from 7 to 49 mg C/m2/hr in Lake Huron. Light-saturated productivity in Lake Erie increased with depth reaching a maximum at 40% surface irradiance. In Lake Huron, algal productivity varied little with depth. Based on mixed effects models, light and exposure to wave action in Lake Erie and Lake Huron best predicted variability in attached algal productivity. High nutrient availability promotes attached algal biomass in Lake Erie, but wave disturbance limits biomass accrual to deeper areas where light is limiting. High water clarity in Lake Huron increases the extent of suitable habitat for attached algae, but low nutrients limit biomass and productivity.

Great Lakes
Primary Production
Light

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Presenters/Authors

Leon Katona (), Wright State University , katona.2@wright.edu;