Peculiarities of Early Ontogeny of Dwarf forms of Arctic Charr salvelinus alpinus Сomplex (Salmonidae) from Lakes Tokko and Bol’shoe Leprindo (Transbaikalia). 1. Pure Formsстатья
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Аннотация:Abstract—The results of the study of growth, ossification sequence and peculiarities of the development ofskeletal elements, body proportions and meristic characters of laboratory-reared larvae and fry of two dwarfforms of Arctic charr Salvelinus alpinus сomplex spawning at the shore slope (Lake Tokko) and in the profundal zone (Lake Bol’shoe Leprindo) (Transbaikalia) are presented. Charr from Lake Bol’shoe Leprindodemonstrated slower rates of growth and morphogenesis, retardation of the ossification of their predorsalbones series with its displacement from larval to juvenile period of the ontogeny, but the acceleration of thedevelopment of the vertebral column. High mortality of pre-larvae of charr from this lake connected with thetransfer to exogenous feeding was observed. For the first time the problem of the reorganization of earlyontogeny of charr of the genus Salvelinus in connection with the colonization of deepwater habitat is discussed. In larvae of charr from Lake Tokko, the ossification of vertebral centra was often accompanied by theformation of anomalous bony structures in the notochord. The phenomenon of the penetration of skeletogenic cells into the notochord, which has been described in hybrids of sympatric charr forms, was found in apure charr form for the first time. The development of characteristic morphological features of the two charrforms in the ontogeny was traced. Differences in body proportions between their fry corresponding to thosebetween adult fish were revealed.
