Cytogenetic Diversity in the Astyanax scabripinnis (Pisces, Characidae) Complex II. Different Cytotypes Living in Sympatry.
نویسندگان
چکیده
منابع مشابه
Astyanax scabripinnis (Pisces: Characidae) hemoglobins: structure and function.
Electrophoretic patterns of hemoglobins, Root effect, Bohr effect in blood and stripped hemoglobin, Hb-O2 affinity GTP modulation of Astyanax scabripinnis (lambari), caught at three different altitudes in Ribeirão Grande, near Campos do Jordão (São Paulo), are described. All populations showed the same electrophoretic patterns: two cathodal components in starch gel. Normal Bohr effect values we...
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The composition of heterochromatin classes along the chromosomes of specimens from two populations of the fish Astyanax scabripinnis was examined using fluorescence banding with GCand AT-DNA specific fluorochromes and fluorescence in situ hybridization (FISH) with an AT-rich satellite DNA (As51) probe. For the pericentromeric heterochromatin blocks neither GC/AT-DNA specific fluorochromes nor t...
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Two new species of Astyanax are described from eastern Brazil: A. microschemos from the córrego Palmital, rio Itapemirim drainage, Espírito Santo, and A. pelecus from the rio Pardo drainage, Bahia. Astyanax microschemos differs from its congeners by its shallower body depth, 26.9-29.7% of standard length, the presence of one vertically elongate humeral spot that extend above and below the later...
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DNA sequences of multiple copies help in understanding evolutionary mechanisms, genomic structures and karyotype differentiation. The current study investigates the organization and distribution of different repetitive DNA in the standard complement and B chromosomes in Astyanax scabripinnis (Jenyns, 1842) chromosomes from three allopatric populations in Campos do Jordão region, São Paulo State...
متن کاملAstyanax hastatus Myers, 1928 (Teleostei, Characidae): A new species complex within the genus Astyanax?
Four populations of Astyanax hastatus Myers 1928 from the Guapimirim River basin (Rio de Janeiro State) were analyzed and three distinct cytotypes identified. These cytotypes presented 2n = 50 chromosomes, with 4M+8SM+10ST+28A (Cytotype A), 8M+10SM+14ST+18A (Cytotype B), 6M+8SM+4ST+32A (Cytotype C) and scanty heterochromatin, mainly located throughout pericentromeric regions of several chromoso...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1995
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.60.273