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Monday, January 25 • 3:40pm - 4:00pm
Assessment of Organic Substrates As Sites For Zebra Mussel Dreissena Polymorpha Attachment In Four West-Central Minnesota Lakes

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AUTHORS: April R. Londo Minnesota State University, Mankato Shannon J. Fisher Minnesota State University, Mankato

ABSTRACT: Of all non-native species to become invasive, zebra mussel Dreissena polymorpha, from the Ponto-Caspian region of southern Russia, are considered to be one of the most damaging. Zebra mussels are successful invaders because the species attaches to substrates with byssal threads, can adapt to a wide range of environmental conditions, and have a free-swimming veliger that is easily transported. Although invasive mollusks pose considerable economic and ecological threats to inland waters, our understanding of them in Minnesota lakes remains limited. Therefore, an improved understanding of the factors that influence zebra mussel density, habitat preference, and distribution is an important component of developing management plans for the invasive mussel. The objective of this study was to assess potential associations zebra mussels may have with organic substrates as habitat in a Minnesota chain-of-lakes system. The study lakes were in west-central Minnesota and were all colonized prior to 2009. In the summer of 2014, mussel, vegetation, and substrate surveys were completed via SCUBA. Zebra mussels were enumerated and measured to determine density and size structure. Vegetation was keyed to species and dried to determined density (biomass/unit area). There was a significant difference in zebra mussel attachment to algaes (i.e., filamentous and Chara spp.) than macrophytes (P=0.001). Additionally, juvenile zebra mussels were found more on organic substrates than adults (P

Monday January 25, 2016 3:40pm - 4:00pm EST
Emerald B