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Lyons, John (John D.); Cochran, Philip Andrew; Fago, Don / Wisconsin fishes 2000: status and distribution

Species accounts,   pp. 15-[68] PDF (2.0 MB)

Page 15

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. 
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). 
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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