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The Southern Brook Lamprey (Ichthyomyzon gagei) in the St. Croix River Drainage of Wisconsin and Minnesota

Philip A. Cochran
Copeia
Vol. 1987, No. 2 (May 13, 1987), pp. 443-446
DOI: 10.2307/1445782
Stable URL: http://www.jstor.org/stable/1445782
Page Count: 4
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The Southern Brook Lamprey (Ichthyomyzon gagei) in the St. Croix River Drainage of Wisconsin and Minnesota
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Abstract

Adult brook lampreys from tributaries to the St. Croix River in Wisconsin and Minnesota are morphologically indistinguishable from Ichthyomyzon gagei and most probably represent a relict population separated by 900 km from the nearest previously reported population in southern Missouri. An alternate hypothesis is that the St. Croix specimens represent an independently evolved satellite species of I. castaneus. Regardless of their taxonomic identity, the St. Croix populations are unique and should be afforded special status by appropriate natural resource agencies until their distribution and abundance can be ascertained.

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