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2018 Update to “An impact assessment of Great Lakes aquatic nonidigenous species”
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2019
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[PDF-687.77 KB]
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Description:Six species were added to the list of established nonindigenous species during this period. At the time of TM-161, Phragmites australis was recognized as widespread in the Great Lakes basin, but considered native. Taxonomic separation of Phragmites australis australis (non-native) from Phragmites australis americanus (native) allowed us to list the former subspecies as an established nonindigenous species with an introduction date of 1869. Salix caprea was recognized as in cultivation in the Great Lakes region, but the extent of escape to natural areas and establishment was not recognized at the time of the previous publication. We add Salix caprea with an introduction date of 1905. Procambarus clarkii was added to the GLANSIS list around 2006 when the species began showing up in Wisconsin, Michigan and Illinois; however, close examination of historic records indicates this species likely became established in the Lake Erie watershed much earlier. We assign this species an introduction date of 1967 based on collections in Sandusky Bay. Three crustacean zooplankton have much more recently been introduced to the Great Lakes and become established.Thermocyclops crassus has been confirmed in samples from Lake Erie as early as 2014 and has recently spread to Lake Superior.Diaphanosoma fluviatile was confirmed in samples from Lake Erie in 2015 and has recently spread to Lake Michigan.Mesocyclops pehpeiensis has been confirmed in samples from Lake Erie as early as 2016. All 3 species exhibit evidence of reproduction and spread. New organism impact assessments were conducted for each of these species and are documented below.
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Rights Information:CC0 Public Domain
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