Lyons, John (John D.); Cochran, Philip Andrew; Fago, Don / Wisconsin fishes 2000: status and distribution
Species accounts, pp. 15- PDF (2.0 MB)
SPECIES ACCOUNTS NATIVE SPECIES Lampreys - Petromyzontidae CHESTNUT LAMPREY Ichthyomyzon castaneus: Secure. Occasional to locally common in the St. Croix and Red Cedar Rivers; uncommon in the Mississippi, Wisconsin, Fox, and Wolf Rivers and their larger tributaries. Becker (1983) and Fago (1983, 1992) provided a number of records of this species from the upper Black River drainage. However, Lyons et al. (1997) re-examined their specimens and made several new collections and concluded that all records from above Lake Arbutus, Clark County, were actually southern brook lampreys. NORTHERN BROOK LAMPREY Ichthyomyzon fossor: Secure. Occasional in streams and small rivers in the central and northern parts of the state, particularly in the Chippewa, middle Wisconsin, Wolf, and Menominee drainages. Becker (1983) and Fago (1992) listed several records for this species from the Wisconsin River drainage above Merrill, Lincoln County, but Lyons et al. (1997) determined that all of these were actually southern brook lampreys. Fago (1986) reported two records of the northern brook lamprey from the St. Croix River drainage, but Lyons et al. (1997) examined the specimens and concluded that they could not be identified to species with certainty. Recent collections from these two localities have yielded only the south- ern brook lamprey and chestnut lamprey. Cochran (1984) documented the first occurrence of the northern brook lamprey in the Illinois River drainage of southeastern Wisconsin, at a single site on the Mukwonago River, Waukesha County. Until the 1960s northern brook lampreys were common in some Lake Superior tributaries, especially the Bois Brule River, Douglas County (Churchill 1945, UWZM speci- mens). Their distribution and abundance there have been greatly reduced by lampricide treat- ments designed to eliminate sea lamprey, although a few small populations may persist (Schuldt and Goold 1980, DuBois and Pratt 1994). SOUTHERN BROOK LAMPREY Ichthyomyzon gagei: Secure. Occasional to locally common in streams and rivers of the St. Croix, upper Black, and upper Wisconsin drainages. New since Becker (1983). See color plate 1 and the distribu- tion map in figure 2. The southern brook lamprey's geographic range was believed to be limited to the southern United States. It was unexpected, therefore, when Cochran (1987) reported this species from the St. Croix River drainage of Wisconsin and Minnesota, over 900 km north of the nearest previously reported population in southern Missouri. Because of the possibility that the widely disjunct northern populations repre- sented a distinct species, subsequent reports on their geographic distribution, biology, and tax- onomy (Cochran and Pettinelli 1988, Cochran and Gripentrog 1992, Lyons 1992, Lyons et al. 1997) sometimes referred to the northern lam- preys provisionally as Ichthyomyzon cf. gagei. Recent morphological (Lyons et al. 1997) and molecular genetic (Mundahl et al. 1997) analy- ses, however, point to the conservative conclu- sion that the northern lampreys are conspecific with Ichthyomyzon gagei from the southern United States. In the account that follows, infor- mation on southern populations has been used to supplement what is known about Ichthyomyzon gagei in Wisconsin.
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