Karyotypes and Cellular DNA Contents of Three Species of the Subfamily Clupeinae.
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概要
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Karyotypes of three species of the subfamily Clupeinae collected from northern Japan were analyzed by in vitro methods and their cellular DNA contents were measured using an integrating microdensitometer. <I>Sardinella zunasi</I> and <I>Sardinops melanostictus</I> show very similar karyotypes: 2n=48, consisting of acrocentric or subtelocentric chromosomes with a gradual decrease in chromosome size, but with differences in cellular DNA of2.32and2.69pg/cell respectively. <I>Clupea pallasi</I>i differs from the aforementioned species in karyotype: 2n=52, consisting of 6 metacentric or submetacentric chromosomes and 46 acrocentric or subtelocentric chromosomes, with a cellular DNA content of 1.96pg/cell. The results showed two different modes in karyological evolution within the subfamily Clupeinae, i.e. an increase of cellular DNA content without apparent change in karyotype, as shown by <I>Sardinella zunasi</I> and <I>Sardinops melanostictus</I>, and less change in cellular DNA content but with marked change in karyotype, as shown by Clupea pallasii.
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