Abstract
ABSTRACT This comprehensive update of the distribution of crayfishes of the genera Cambarus and Fallicambarus in Ontario includes substantial material collected since 1965 and a reexamination of previous records. Revised provincial range limits are presented for two wide-ranging, openwater species, C. bartonii bartonii and C. robustus, as well as for 2 obligate burrowers of more restricted distribution, C. diogenes and F. fodiens. Previously unreported locality records represent range extensions, fill in geographic gaps in known ranges, or confirm the persistence of populations for periods of several decades. Limits to the ranges of the 4 species appear to be established by patterns of postglacial migration and habitat preferences. A diagnosis of the current status of each of these species suggests the potential impact of anthropogenic perturbations, such as lake acidification and wetland destruction, for the future of these crayfishes in Ontario.
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