On Intraspecies Forms of the Mongolian grayling (<Emphasis Type="Italic">Thymallus brevirostris</Emphasis>Kessl.) from Hoton Nur Lake (Western Mongolia) |
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Authors: | Yu V Slynko B Mendsaykhan A N Kas’anov |
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Institution: | (1) Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, Russia, 660036;(2) National Water Research Institute, Environment, 5050, Canada, 867 Lakeshore Road, Burlington, Ontario Canada, L7R 4A6;(3) Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, 660036, Krasnoyarsk, Akademgorodok, Russia |
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Abstract: | Morphological and ecological traits of the Mongolian grayling Thymallus brevirostrisfrom Hoton Nur Lake are investigated with consideration of the assumption for a possible presence in this species of two morpho-ecological
forms. The data on growth, feeding, sex, and age composition are presented. Plastic and meristic characters, distribution
of fish in the water body, and feeding are analyzed. Within the age range of 3+ to 6+, in the population there are two groups
of specimens differing in growth rate, diet, and some plastic characters of the head. These two groups may be designated as
“predatory” and “benthos-feeding” forms. The predatory form lacks specimens of junior age groups; the benthos_feeding form
lacks specimens older than seven years. Validity of these morpho-ecological groups is discussed. |
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