. The Canadian field-naturalist. 1993 Goodchild: Status of the Northern Madtom 419. Figure 3. Canadian distribution of the Northern Madtom, Noturus stigmosus. junction of Lake St. Clair and Detroit River, Wayne County (University of Michigan Museum of Zoology; UMMZ 132009)]. They are also frequently reported from the Huron River, Michigan. The Huron River flows into the Detroit River at its mouth in Lake Erie (Taylor 1969). Based on collection records, the Detroit River, Lake St. Clair area is the northern limit of the distri- bution of Noturus stigmosus. Evidently the species has not been abl
. The Canadian field-naturalist. 1993 Goodchild: Status of the Northern Madtom 419. Figure 3. Canadian distribution of the Northern Madtom, Noturus stigmosus. junction of Lake St. Clair and Detroit River, Wayne County (University of Michigan Museum of Zoology; UMMZ 132009)]. They are also frequently reported from the Huron River, Michigan. The Huron River flows into the Detroit River at its mouth in Lake Erie (Taylor 1969). Based on collection records, the Detroit River, Lake St. Clair area is the northern limit of the distri- bution of Noturus stigmosus. Evidently the species has not been able to disperse further into Canadian waters, due to thermal or ecological barriers that have not yet been identified. It is also possible that small populations of Northern Madtoms have gone undetected (see Population Sizes and Trends). In recent times, the ecological degradation of the area may also be a barrier to further dispersal. In a study of potential invasion of the Great Lakes by various fish species during a period of climactic warming, the Northern Madtom was considered unlikely to invade based on a composite of ecological require- ments (Mandrak 1989). Protection No specific protection exists in Canada other than that generally afforded by the habitat sections of the federal Fisheries Act. Since 1988 the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) has suggested assigning a vulnerable (Ontario) status designation (Campbell 1988, 1989, 1990). In the United States, it was listed as rare in Michigan (Miller 1972), of special concern in Kentucky, Mississippi, Tennessee and West Virginia, and legally protected in Michigan and Ohio (Johnson 1987). Population Size and Trend There is no evidence of a reproducing population of Noturus stigmosus in Canada. The only specimen that has been captured in Canadian waters was col- lected near the United States border, at the northern fringe of its range. However, little trawling had pre- viously been done in the
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