Download Fish Karyotypes: A Check List by Ryoichi Arai PDF

By Ryoichi Arai

Because the greatest crew of extant vertebrates, fish provide a nearly unlimited variety of outstanding examples of evolutionary edition to environmental and biotic choice strain. the main varied of all vertebrate teams, the better taxa of fish regularly were categorised by means of morphology and paleontology, with a way smaller enter of cytogenetic details. DNA series information are exerting an more and more robust impression on sleek fish systematics, demanding the category of various greater taxa starting from genera to orders. the main fruitful process, notwithstanding, contains man made analyses of morphology, molecular phylogenetics, comparative karyology, and genome dimension. Karyotypes of greater than 3400 species/subspecies are prepared right here via fish systematics and comprise an inventory of genome measurement, intercourse chromosomes, B chromosomes, polyploidy, and locality of fabric fish, between others. This quantity allows either rookies and complicated researchers to survey the prevailing literature and allows the implementation of an integrative method of fish systematics. the 1st publication on fish chromosomes in approximately 15 years, it's also the main entire.

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Additional info for Fish Karyotypes: A Check List

Sample text

Column D contains diploid chromosome number (2n), marked with an asterisk when inferred from a haploid number. B chromosomes, as a rule, were excluded from diploid chromosome number. Column E includes the karyotype. Classification fi of chromosomes followed Levan et al. (L-25): M, metacentrics, SM, submetacentrics, ST, subtelocentrics, A, acrocentrics. When these could not be clearly derived from source publications, classification fi was as follows: meta- and/or submetacentric (M/SM), submeta- and/or subtelocentric (SM/ST), and subtelo- and/or acrocentric (ST/A).

Column G (NF2) contains fundamental arm number, when M, SM, and ST are counted as two-armed. The arm number by Scheel (1972: S-24) differs from NF2. , NF sensu Scheel ≥ NF2. Therefore, Scheel’s arm number is shown in parentheses. Column H includes the number of Ag-NORs. The number and position of NORs can differ by different methods such as chromomycin A3 and silver staining. Silver staining is the method specific fi to NORs and studied widely. The number of Ag-NORs in the embryo tends to be larger than that of adults.

Column E includes the karyotype. Classification fi of chromosomes followed Levan et al. (L-25): M, metacentrics, SM, submetacentrics, ST, subtelocentrics, A, acrocentrics. When these could not be clearly derived from source publications, classification fi was as follows: meta- and/or submetacentric (M/SM), submeta- and/or subtelocentric (SM/ST), and subtelo- and/or acrocentric (ST/A). Difference in the karyotype could be attributed to different degrees of chromosome condensation, leading to differences in chromosome classifi fication among authors.

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