Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence
Few chromosomal reports are available for the endemic fish fauna from coastal basins in northeastern Brazil, and regional biodiversity remains partially or completely unknown. This is particularly true for Loricariidae, the most diverse family of armored catfishes. In the present work, allopatric po...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200008&lng=en&tlng=en |
| _version_ | 1819264898638544896 |
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| author | Jamille de Araújo Bitencourt Paulo Roberto Antunes de Mello Affonso Lucia Giuliano-Caetano Ana Lucia Dias |
| author_facet | Jamille de Araújo Bitencourt Paulo Roberto Antunes de Mello Affonso Lucia Giuliano-Caetano Ana Lucia Dias |
| author_sort | Jamille de Araújo Bitencourt |
| collection | DOAJ |
| description | Few chromosomal reports are available for the endemic fish fauna from coastal basins in northeastern Brazil, and regional biodiversity remains partially or completely unknown. This is particularly true for Loricariidae, the most diverse family of armored catfishes. In the present work, allopatric populations of Hypostomus cf. wuchereri (Siluriformes: Loricariidae) from two basins in Bahia (northeastern Brazil) were cytogenetically analyzed. Both populations shared 2n = 76 chromosomes, a karyotype formula of 10m+18sm+48st/a (FN = 104) and single terminal GC-rich NORs on the second metacentric pair. Nevertheless, microstructural differences were detected by C-banding, fluorochrome staining and chromosomal digestion with restriction enzymes (Alu I, Bam HI, Hae III, and Dde I). The population from Una River (Recôncavo Sul basin) showed conspicuous heterochromatin blocks and a remarkable heterogeneity of base composition (presence of interspersed AT/GC-rich and exclusively AT- or GC-rich sites), while the population from Mutum river (Contas River basin) presented interstitial AT-rich C-bands and terminal GC/AT-rich heterochromatin. Each enzyme yielded a specific band profile per population which allowed us characterizing up to five heterochromatin families in each population. Based on the present data, we infer that these populations have been evolving independently, as favored by their geographic isolation, probably representing cryptic species. |
| first_indexed | 2024-12-23T20:36:48Z |
| format | Article |
| id | doaj.art-137734e3a6cf45549e0493c840cad1f3 |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-23T20:36:48Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-137734e3a6cf45549e0493c840cad1f32022-12-21T17:32:02ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02249231732410.1590/S1679-62252011000200008S1679-62252011000200008Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidenceJamille de Araújo Bitencourt0Paulo Roberto Antunes de Mello Affonso1Lucia Giuliano-Caetano2Ana Lucia Dias3Universidade Estadual de LondrinaUniversidade Estadual de LondrinaUniversidade Estadual de LondrinaUniversidade Estadual de LondrinaFew chromosomal reports are available for the endemic fish fauna from coastal basins in northeastern Brazil, and regional biodiversity remains partially or completely unknown. This is particularly true for Loricariidae, the most diverse family of armored catfishes. In the present work, allopatric populations of Hypostomus cf. wuchereri (Siluriformes: Loricariidae) from two basins in Bahia (northeastern Brazil) were cytogenetically analyzed. Both populations shared 2n = 76 chromosomes, a karyotype formula of 10m+18sm+48st/a (FN = 104) and single terminal GC-rich NORs on the second metacentric pair. Nevertheless, microstructural differences were detected by C-banding, fluorochrome staining and chromosomal digestion with restriction enzymes (Alu I, Bam HI, Hae III, and Dde I). The population from Una River (Recôncavo Sul basin) showed conspicuous heterochromatin blocks and a remarkable heterogeneity of base composition (presence of interspersed AT/GC-rich and exclusively AT- or GC-rich sites), while the population from Mutum river (Contas River basin) presented interstitial AT-rich C-bands and terminal GC/AT-rich heterochromatin. Each enzyme yielded a specific band profile per population which allowed us characterizing up to five heterochromatin families in each population. Based on the present data, we infer that these populations have been evolving independently, as favored by their geographic isolation, probably representing cryptic species.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200008&lng=en&tlng=enBiodiversityCytogeneticsHeterochromatinHypostominii |
| spellingShingle | Jamille de Araújo Bitencourt Paulo Roberto Antunes de Mello Affonso Lucia Giuliano-Caetano Ana Lucia Dias Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence Neotropical Ichthyology Biodiversity Cytogenetics Heterochromatin Hypostominii |
| title | Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence |
| title_full | Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence |
| title_fullStr | Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence |
| title_full_unstemmed | Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence |
| title_short | Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae): karyotypic evidence |
| title_sort | identification of distinct evolutionary units in allopatric populations of hypostomus cf wuchereri gunther 1864 siluriformes loricariidae karyotypic evidence |
| topic | Biodiversity Cytogenetics Heterochromatin Hypostominii |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200008&lng=en&tlng=en |
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