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Studies on the variability of the land locked miyabe char salvelinus malma miyabei part 3 geographical variations of the dolly varden salvelinus malma and morphological characters of the miyabe char



Studies on the variability of the land locked miyabe char salvelinus malma miyabei part 3 geographical variations of the dolly varden salvelinus malma and morphological characters of the miyabe char



Japanese Journal of Ichthyology 24(1): 49-56



Geographical variations of some meristic characters of the Dolly Varden S. malma, collected in some districts (Nome and Anchorage [Alaska, USA], Juneau [Wisconsin, USA] and Seattle [Washington, USA]) of North America, Bering Sea, Okhotsk Sea and in some rivers of Hokkaido [Japan] were investigated with special reference to the systematics of the Miyabe char, S. m. miyabei, in Lake Shikaribetsu in Hokkaido. An obvious geocline associated with an increase in the number of vertebrae, gill-rakers, dorsal rays and pored scales of the north American populations was found. Toward the east and the uplands, slight increases in the number of vertebrae and pored scale were observed in the land-locked populations of Hokkaido. No significant differences were recognized in the number of anal rays among populations of the Dolly Varden, however, pyloric ceca were slightly fewer in Hokkaido populations than in the others. Meristic characters of the Miyabe char, excepting gill-rakers, were similar to those of Dolly Varden living in Hokkaido. A striking characteristic of the Miyabe char was found in the number of gill-rakers and accessory gill-rakers in the medial surface of the gill arch. Gill-rakers of the Miyabe char were the most numerous among all Dolly Varden investigated. Considered in relation to food habitats of the anadromous Dolly Varden, changes in morphology might be adaptations to plankton feeding.

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Accession: 006522919

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