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1 December 2010 Status of Non-Indigenous Benthic Invertebrates in the Duluth-Superior Harbor and the Role of Sampling Methods in Their Detection
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Abstract

As part of a study to develop recommendations for non-indigenous species (NIS) monitoring in Great Lakes areas at risk of invasion, we conducted intensive sampling in the Duluth-Superior Harbor and lower St. Louis River in 2005 and 2006. Of the ∼240 benthic invertebrate taxa identified, 19 were non-indigenous, including 8 first detection records for this system: New Zealand mud snail Potamopyrgus antipodarum; African/Asianorigin cladoceran Daphnia lumholtzi; Eurasian-origin amphipod Echinogammarus ischnus; Eurasian-origin bivalves Dreissena bugensis, Pisidium henslowanum and Pisidium supinum; and possibly range expanding oligochaetes Paranais frici and Pristina acuminata. Dreissenids were by far the most abundant NIS. Several other NIS were also common, but others were detected in only a few of the >200 samples taken. Non-indigenous amphipods and Dreissena were most frequently detected in sweep net and colonization plate samples of littoral vegetation, while NIS oligochaetes, gastropods, and non-dreissenid bivalves were most frequently detected in ponar and bottom sled samples of sediments. Our findings confirm that this major shipping port remains a NIS “hotspot” and emphasize that regular surveys covering a range of habitats with multiple sampling gears and thorough taxonomic effort are needed to detect and monitor non-indigenous species.

Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
Anett S. Trebitz, Corlis W. West, Joel C. Hoffman, John R. Kelly, Gregory S. Peterson, and Igor A. Grigorovich "Status of Non-Indigenous Benthic Invertebrates in the Duluth-Superior Harbor and the Role of Sampling Methods in Their Detection," Journal of Great Lakes Research 36(4), 747-756, (1 December 2010). https://doi.org/10.1016/j.jglr.2010.09.003
Received: 19 March 2010; Accepted: 1 September 2010; Published: 1 December 2010
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