Cystidicola farionis (Nematoda) as an Indicator of Lake Trout ( Salvelinus namaycush ) of Bering Ancestry

Cystidicola farionis Fischer is widely distributed in fishes in northern North America west of the Appalachian Mountains. The swimbladders of lake trout (Salvelinus namaycush) from 225 localities across North America were examined for the parasite but only those from the Alsek, Coppermine, Flat, Pee...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Author: Black, Geoff A.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 1983
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Yukon
Northwest Territories
Stikine
Liard
Upper Liard
Yukon river
Beringia
Online Access:http://dx.doi.org/10.1139/f83-234
http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-234
Description
Summary:Cystidicola farionis Fischer is widely distributed in fishes in northern North America west of the Appalachian Mountains. The swimbladders of lake trout (Salvelinus namaycush) from 225 localities across North America were examined for the parasite but only those from the Alsek, Coppermine, Flat, Peel, Stikine, Upper Liard, and Yukon River systems were infected with mature nematodes. The ancestors of fishes in these watersheds survived glaciation in a Bering refugiurn. Thus, this strain of C. farionis probably had a refugium in Beringia in the unglaciated parts of the Yukon River system and dispersed from there into northern British Columbia and the coastal mainland of the Northwest Territories during glacial retreat.

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