Download Fish Karyotypes: A Check List by Ryoichi Arai PDF

April 4, 2017 | Zoology | By admin | 0 Comments

By Ryoichi Arai

Because the biggest team of extant vertebrates, fish provide a nearly unlimited variety of impressive examples of evolutionary version to environmental and biotic choice strain. the main diversified of all vertebrate teams, the better taxa of fish normally 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 glossy fish systematics, difficult the category of diverse better taxa starting from genera to orders. the main fruitful method, in spite of the fact that, contains artificial analyses of morphology, molecular phylogenetics, comparative karyology, and genome measurement. Karyotypes of greater than 3400 species/subspecies are prepared right here by way of fish systematics and comprise a listing of genome dimension, intercourse chromosomes, B chromosomes, polyploidy, and locality of fabric fish, between others. This quantity permits either rookies and complicated researchers to survey the prevailing literature and enables the implementation of an integrative method of fish systematics. the 1st booklet on fish chromosomes in approximately 15 years, it's also the main accomplished.

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Additional resources for Fish Karyotypes: A Check List

Sample text

Column A contains current scientifi fic names of karyotyped taxon. Classifi fication of species, as a rule, followed Eschmeyer’s Catalogue of Fishes (E-13). Classifi fication of higher taxa than species, as a rule, followed Nelson (N-68). Hybrids were not included. Synonymy of species/ subspecies followed, as a rule, Eschmeyer (E-13). Column B includes the names used in the original karyotype papers in cases in which these differ from currently accepted classification. fi Column C shows the sex of fi fishes studied.

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.

However, the question of the C-value enigma has been a puzzle for almost half a century, which suggests that a simple comparison of taxa and their genome size may be insufficient fi for the study of genome evolution in fishes. Concerning genome size, the transposable elements, the spectrum of size and frequency of small spontaneous nucleotide insertions and deletions, and genome duplication are the important parameters in the long-term evolution of genome size (Petrov 2001: P-5; Gregory 2005: G-22).

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