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Open AccessArticle

Phytoplankton Communities in Green Bay, Lake Michigan after Invasion by Dreissenid Mussels: Increased Dominance by Cyanobacteria

1
Department of Biology, Lawrence University, 711 E. Boldt Way, Appleton, WI 54911, USA
2
Department of Ecology and Evolution, Stony Brook University, 650 LSB, Stony Brook, NY 11794-5245, USA
3
Center for Population Biology, University of California Davis, One Shields Ave, Davis, CA 95616, USA
*
Author to whom correspondence should be addressed.
Diversity 2014, 6(4), 681-704; https://doi.org/10.3390/d6040681
Received: 1 September 2014 / Revised: 10 October 2014 / Accepted: 28 October 2014 / Published: 6 November 2014
(This article belongs to the Special Issue Biological Invasions)
Biological invasions of aquatic systems disrupt ecological communities, and cause major changes in diversity and ecosystem function. The Laurentian Great Lakes of North America have been dramatically altered by such invasions, especially zebra (Dreissena polymorpha) and quagga (D. rostriformis bugensis) mussels. Responses to mussel invasions have included increased water clarity, and decreased chlorophyll and phytoplankton abundance. Although not all systems have responded similarly, in general, mussels have changed nutrient dynamics and physical habitat conditions. Therefore examination of different impacts can help us further understand mechanisms that underlie ecosystem responses to biological invasions. To aid our understanding of ecosystem impacts, we sampled established locations along a well-studied trophic gradient in Green Bay, Lake Michigan, after the 1993 zebra mussel invasion. A strong trophic gradient remained during the period sampled after the mussel invasion (2000–2012). However, mean summer chlorophyll increased and other measures of phytoplankton biomass (microscope and electronic cell counting) did not change significantly. Multivariate analyses of phytoplankton community structure demonstrate a significant community shift after the invasion. Cyanobacteria increased in dominance, with Microcystis becoming the major summer taxon in lower Green Bay. Diatom diversity and abundance also increased and Chlorophyta became rare. Phytoplankton responses along the trophic gradient of Green Bay to zebra mussel invasion highlight the importance of mussel effects on nutrient dynamics and phytoplankton diversity and function. View Full-Text
Keywords: cyanobacteria; Dreissena; Green Bay; phytoplankton; zebra mussel; diversity cyanobacteria; Dreissena; Green Bay; phytoplankton; zebra mussel; diversity
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De Stasio, B.T.; Schrimpf, M.B.; Cornwell, B.H. Phytoplankton Communities in Green Bay, Lake Michigan after Invasion by Dreissenid Mussels: Increased Dominance by Cyanobacteria. Diversity 2014, 6, 681-704.

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