Seasonal Si:C ratios in Lake Erie diatoms - Evidence of an active winter diatom community

Document Type

Article

Publication Date

6-1-2012

Publication Title

Journal of Great Lakes Research

Volume

38

Issue

2

First Page

206

Keywords

Diatom, Hypoxia, Lake Erie, Primary production, Silica, Winter limnology

Last Page

211

Abstract

Recent investigations of Lake Erie in the winter have demonstrated the occurrence of substantial phytoplankton communities largely consisting of the diatom Aulacoseira islandica (O. Müller) Simonsen. To assess the activity of this diatom community, multiple measures of production, both general and diatom-specific, were undertaken. We measured oxygen (O 2) evolution as proxy for carbon (C)-fixation and 2-(4-pyridyl)-5-((4-(2-dimethylaminoethylaminocarbamoyl) methoxy)-phenyl)oxazole (PDMPO) incorporation as a measure of silica (Si) deposition. The latter demonstrated conclusively that diatoms were active during winter months and confirmed that diatoms are the primary drivers of winter productivity. The stoichiometric relationship between carbon and silica in the winter Lake Erie phytoplankton assemblage was further compared to the activity of the summer community. Although the winter phytoplankton community was observed to be active, it was less active than the summer community, with lower measured rates of O 2 evolution and Si deposition. These findings provide a new and expanded understanding of the biological carbon production in Lake Erie. © 2012 Elsevier B.V.

DOI

10.1016/j.jglr.2012.02.009

ISSN

03801330

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