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• W2211950546 abstract "Among American cichlids, Geophagus stands out as a species-rich genus widespread over neotropical region. Despite their diversity and confusing taxonomy, only few and basic chromosomal reports are available in populations/species along Atlantic coast, hindering our understanding about evolutionary trends in this genus. Therefore, detailed chromosomal studies were performed in Geophagus brasiliensis complex from coastal rivers in northeastern Brazil, totalizing seven populations of Geophagus brasiliensis and one of Geophagus itapicuruensis. All samples shared a diploid number (2n) of 48 divided into 2 submetacentric and 46 subtelocentric/acrocentric chromosomes with (peri)centromeric heterochromatin, hypothesized as a symplesiomorphy for Geophagini. Although G. itapicuruensis and two populations of G. brasiliensis presented single NORs on short arms, multiple GC-rich rDNA sites were observed in the remaining G. brasiliensis samples, ranging from three to six NOR-bearing chromosomes. Inversely, 5S rDNA sites were invariably located at interstitial region on a st/a pair, nonsyntenic to NORs. A compilation of the data set in Geophagus shows that their chromosomal evolution has been driven by pericentric inversions and microstructural changes. Besides, the divergence found in northeastern Brazil places this region as a biodiversity hotspot. A taxonomic revision in the complex Geophagus brasiliensis is recommended with the support of cytogenetic analyses." @default.
• W2211950546 created "2016-06-24" @default.
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• W2211950546 date "2016-02-01" @default.
• W2211950546 modified "2023-09-26" @default.
• W2211950546 title "Cryptic Chromosomal Diversity in the Complex “Geophagus” brasiliensis (Perciformes, Cichlidae)" @default.
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• W2211950546 doi "https://doi.org/10.1089/zeb.2015.1169" @default.
• W2211950546 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26683087" @default.
• W2211950546 hasPublicationYear "2016" @default.
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