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first cytogenetic characterization of the sub-arctic marine fish mallotus villosus (müller, 1776), osmeriformes, osmeridae


作者單位:I Department of Biology, University of Genova, Genova, ItalyII Département Systématique et Evolution, Museum National d‘Histoire Naturelle, Paris, FranceIII University of Tromsø, The Norwegian College of Fishery Science, Tromsø, Norway

【摘要】 the capelin, mallotus villosus (osmeriformes, osmeridae), is an ecological and commercial key component of the sub-arctic ichthyofauna. here, we provide the first cytogenetic information on the species based on both conventional karyotyping and chromosomal mapping of 45s and 5s ribosomal genes through fluorescence in situ hybridization (fish). the capelin genome displayed a diploid number of 54 with the karyotypic formula 26m/sm+28st/a and a fundamental number (fn) = 80. both classes of ribosomal genes appeared to be spread out to multiple chromosomal locations, i.e. the 45s and 5s rdna clusters were detected on six and seven chromosome pairs, respectively. a linked chromosomal organization of the major and minor ribosomal genes classes has been visualized in most of the rdnas chromosomal locations. a comparative analysis of the available cytogenetic data for the family osmeridae reveals diploid numbers higher than 48 and high fundamental numbers. this suggests that a rearranged karyotype is a shared feature within this family.

【關鍵詞】 capelin chromosomes osmeridae ribosomal genes


introduction


the capelin, mallotus villosus (müller, 1776), is a smeltlike fish species widely distributed in sub-arctic waters (gjøsæter, 1998). the monospecific genus mallotus belongs to the family osmeridae ( sensu johnson and patterson, 1996). the precise position of mallotus within the osmeridae has been challenged, however. johnson and patterson (1996) included the genus within the tribe salangini, whereas it appears to be closer related to the osmerini/hypomesinae clade according to a recent analysis of mitochondrial dna sequences (fu et al., 2005).

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