Journal
JOURNAL OF GREAT LAKES RESEARCH
Volume 38, Issue 1, Pages 18-30Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jglr.2011.12.008
Keywords
Aulacoseira islandica; Bloom; Diatom; Ice; Lake Erie; Winter
Funding
- Lake Erie Protection Fund
- Ohio Sea Grant
- New York Sea Grant [R-CE-29]
- Pennsylvania Sea Grant
- NOM-OAR
- Environment Canada
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The limnology of offshore Lake Erie during periods of extensive (>70%) ice cover was examined from ship borne sampling efforts in 2007 to 2010, inclusive. Dense and discrete accumulations of the centric filamentous diatom Aulacoseria islandica (>10 mu g Chl-a/L) were located in the isothermal (<1 degrees C) water column directly below the ice and only detectable in the ship wake; viable phytoplankton were also observed within ice. Evidence from these surveys supports the notions that winter blooms of diatoms occur annually prior to the onset of ice cover and that the phytoplankton from these blooms are maintained in the surface waters of Lake Erie and reduce silicate concentrations in the lake prior to spring. The mechanisms by which high phytoplankton biomass rise at this time of year requires further investigation, but these winter blooms probably have consequences for summer hypoxia and how the lake responds to climate change. (C) 2012 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
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