Seasonal Races of Chum Salmon Oncorhynchus keta and their Interrelations in Kamchatka Riversстатья
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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.
Аннотация:dates of migration and spawning, size-age structure, and fecundity of seasonal races of chum salmon Oncorhynchus keta from the Kol River are reviewed, those of early summer, late summer amd autumn races, as well as localization and structure of their spawing grounds, bed-sediment particle size in the redds, hydrological and thermal comditions on spawning grounds, and meristic characters of races. Special traits of reproduction of seasonal races within the species range and in Kamchatka in particular are discussed. The number of seasonal races in rivers depends on the presence of various habitats sutable for spawning. In rivers with complicated hydrogeomorphological structure, the number of seasonal races increases. Variations of types of seasonal races in a particular river and in the whole species area are epigenetic, i.e. they depend on the hereditary genetic program and presence of conditions providing its realization via various channels.