Life cycle and structure of populations of three-spined stickleback Gasterosteus aculeatus (Fam. Gasterosteidae) in rivers of northwestern Kamchatka (with reference to the Utkholok River)статья
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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.
Аннотация:Abstract
From the end of May to mid-August 2005 and 2006, the dynamics of migrations and spawning, as well as specific features of development, growth, and feeding migration of the three-spined stickleback Gasterosteus aculeatus in the salmon river Utkholok of the mountain-tundra type were studied. Morphological characteristics, age, fecundity, dates of reproduction and spawning biotopes, structure of spawning groups, and specific features of feeding were investigated. On the basis of the obtained data, it was concluded that the riverine and migratory forms of three-spined sticklebacks from the Utkholok River belong to a single population. Biological specific features of spawners with high (2005) and low (2006) numbers of the migratory form were compared. For comparison, we also used our own data on the morphology and biological analysis of the migratory three-spined stickleback from the Kol River salmon of the mountain type.