. The Canadian field-naturalist. Natural history. 1997 McPhail: Status of the Nooksack Dace 261. Figure 2. Geographic range of the Nooksack Dace, Rhinichthys sp. inset depicts Canadian distribution. Taylor, in preparation). Still, Chehalis isolates usual- ly can be separated from their Columbia counterparts by a combination of morphological traits. Because the geographic distributions of most Chehalis iso- lates do not overlap with their closest relatives, any decisions regarding their taxonomic status (e.g., species or subspecies) are necessarily arbitrary; how- ever their status as independa
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. The Canadian field-naturalist. Natural history. 1997 McPhail: Status of the Nooksack Dace 261. Figure 2. Geographic range of the Nooksack Dace, Rhinichthys sp. inset depicts Canadian distribution. Taylor, in preparation). Still, Chehalis isolates usual- ly can be separated from their Columbia counterparts by a combination of morphological traits. Because the geographic distributions of most Chehalis iso- lates do not overlap with their closest relatives, any decisions regarding their taxonomic status (e.g., species or subspecies) are necessarily arbitrary; how- ever their status as independant, divergent lineages are not debatable, and for conservation purposes they should be regarded as species. Certainly, their distinctive morphologies, gene sequences and char- acteristic geographic distributions argue that the Nooksack Dace has not exchanged genes with the Longnose Dace for a long time (i.e., since well before the beginning of the last galciation and, per- haps, since before the Pleistocene).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club