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1992. Genetic identification and implications of another invasive species of dreissenid mussel in the Great bakes. Can. 8. in this paper we report the discovery and implications of a second nonindigenous species of dreissenid mussel in the Great bakes. This species was detected in a routine screening of zebra mussels (Daeissena plymorpha) for allozyme variability. The two species differ at allozyme loci (Nei's I = 0.30 using 12 loci) and in their shell morphology (the second species lacks the acute angle, or carina, between the ventral and dorsal surfaces of the shell s f the zebra mussel). As a working name, at least until its species identity is discovered, we have called the new species the "quagga mussel." Currently, this mussel occurs in bake Ontario in equal frequencies with D. polymorpha. Its low frequency s f occurence in neighboring waters (e.g. the Erie canal, Niagara River, and outlet to Onondaga bake) and lack of occurrence in any of the other Great Lakes suggest that (1) its pint of introduction t s North America was in Lake Ontario and (2) its range may expand. Les auteurs signalent la decouverte d'une seconde espGce exotique de moule de la famille des Dreissknides dans les Grands Lacs et examinent les r~percussions de cette dkcouverte. k'espece a kt4 identifike Bors d'essais courants sur la variabilite des allozyrnes de la mode zebrke (Dreissena polymoapha). Les deux espGces se distinguewt par les differents loci des allozymes (Nei's I = 0,38 % 4 2 loci) et rnorphslogie de %a coquille (la nouvelle espece ne montrant pas I'angle aigu, ou carhe, que montre la coqul'lle de la moule zebree entre la face ventrale et la face dorsale). jusqu'a ce gue cette nouvelle espece soit identifiee, les auteurs Bui donnent le norn vernaculaire anglais ((quagga mussel*. A l'heksre actuelle, elle est retrouvee dans le lac Ont9rio 2 une frkquence semblable % 5. palyrnsrpha. Sa faible frkquence dans les eaux voisines (par ex., le canal Erie, la riviere Niagara et l'krnissaire du lac Onondaga) et son absence dans les autres Grands Lacs portent 3 croire que le lac Ontario est le point d'introduction de B'espece en Arnkrique du Nord et que son aire de repartition peut s'agrandir.

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The discovery of a second dreissenid species, the quagga mussel, in the Great Lakes in 1991 prompted a search for its identity. We have identified the North American quagga mussel as Dreissena bugensis Andrusov on the basis of allozyme data and morphological characters. Further, a phenotypically distinct form of the quagga mussel found in Lakes Erie and Ontario also matches the electrophoretic profiles of the typical Lake Ontario quagga and European D. bugensis. We confirm that the white "profunda" mussel found in the deep waters of Lake Erie is a phenotype of the quagga mussel, and we conclude that the quagga mussel is D. bugensis which has been introduced from the Black Sea drainage of Ukraine.