. The Canadian field-naturalist. 1996 Mandrak and Grossman: Status of the Lake Chubsucker 481. Erimyzon sucetta ©captured before 1970 • captured 1970 - 1983 Figure 2. Canadian distribution of Erimyzon sucetta. Inset map: North American distribution of the Lake Chubsucker (modified from Lee et al. 1980). Note: this species has not been recorded in Canada since 1983. the northeastern range limit of the species. Therefore, until adequate sampling of these popula- tions is undertaken to determine their stability, it is recommended that the Lake Chubsucker be classi- fied as Vulnerable in Canada. T
. The Canadian field-naturalist. 1996 Mandrak and Grossman: Status of the Lake Chubsucker 481. Erimyzon sucetta ©captured before 1970 • captured 1970 - 1983 Figure 2. Canadian distribution of Erimyzon sucetta. Inset map: North American distribution of the Lake Chubsucker (modified from Lee et al. 1980). Note: this species has not been recorded in Canada since 1983. the northeastern range limit of the species. Therefore, until adequate sampling of these popula- tions is undertaken to determine their stability, it is recommended that the Lake Chubsucker be classi- fied as Vulnerable in Canada. The choice of status is effected by differences in population trends in protected habitats (, Point Pelee and Rondeau parks) and unprotected habitats (, riverine habitats). It is obvious that the popula- tions in the protected habitats are, by definition. Vulnerable. The unprotected habitats, for which there is poor information, account for a significant portion of the Canadian range of the Lake Chubsucker. As the result of human actions, popula- tions in unprotected habitats may be threatened with imminent extirpation which suggests a status of Endangered. Additional information may lead to a reevaluation of the status assigned. Acknowledgments E. Holm, D. E. McAllister, J. S. Nelson and A. Peden provided useful comments on the manuscript. Financial support for this project was provided by an Environmental Youth Corps grant to EJC, the Royal Ontario Museum, and a World Wildlife Fund grant to EJC. F. Arnaud, K. Dunham, E. Holm and W. Ramshaw assisted with the resampling of some cap- ture sites, and the verification and summary of distri- bution records. Distribution maps were drawn by W. Ramshaw. Additional distributional data were pro- vided by the Canadian Museum of Nature Ottawa, and the University of Michigan Museum of Zoology, Ann Arbor, Michigan. Literature Cited Adams, A. L. 1873. Field and forest rambles, with notes and observations on the natural history of e
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