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1 September 2010 Early Observations on an Emerging Great Lakes Invader Hemimysis anomala in Lake Ontario
Maureen G. Walsh, Brian F. Lantry, Brent Boscarino, Kelly Bowen, Jocelyn Gerlofsma, Ted Schaner, Richard Back, Jennifer Questel, A. Garry Smythe, Roberta Cap, Michael Goehle, Bryan Young, Marc Chalupnicki, James H. Johnson, James E. McKenna Jr
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Abstract

Hemimysis anomala, a Ponto-Caspian littoral mysid, is an emerging Great Lakes invader that was discovered in Lakes Michigan and Ontario in 2006. Similar to the native mysid Mysis diluviana, Hemimysis exhibits a diel vertical migration pattern but generally inhabits shallower and warmer waters than M. diluviana. Because basic information on the distribution, habitat use, and biology of Hemimysis in the Great Lakes is scarce, the potential for food web disruption by Hemimysis cannot easily be predicted. Preliminary observations indicate widespread invasion of Hemimysis in Lake Ontario. In this study, we confirm the presence of Hemimysis at sites spanning the northern and southern shores of Lake Ontario and the presence of the individuals during winter months. In one horizontal tow in November 2007, over 26,000 individuals were collected with a length range of 4.4 to 9.0 mm and an average caloric density of 611 cal/g wet weight. The most effective methods for sampling Hemimysis were horizontal tows with either a Zooplankton net in the water column or a benthic sled near the lake bottom. Although more quantitative data on the life history and distribution of this species is necessary, our preliminary observations support the prediction that the potential for Hemimysis to impact the nearshore food web in Lake Ontario appears high.

Published by Elsevier B.V.
Maureen G. Walsh, Brian F. Lantry, Brent Boscarino, Kelly Bowen, Jocelyn Gerlofsma, Ted Schaner, Richard Back, Jennifer Questel, A. Garry Smythe, Roberta Cap, Michael Goehle, Bryan Young, Marc Chalupnicki, James H. Johnson, and James E. McKenna Jr "Early Observations on an Emerging Great Lakes Invader Hemimysis anomala in Lake Ontario," Journal of Great Lakes Research 36(3), 499-504, (1 September 2010). https://doi.org/10.1016/j.jglr.2010.04.012
Received: 29 September 2009; Accepted: 15 April 2010; Published: 1 September 2010
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KEYWORDS
Great Lakes
Hemimysis anomala
invasive
Lake Ontario
mysid
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