Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil
The lacustrine system of the middle rio Doce basin is considered a paradigm of Pleistocene geomorphology. In these lakes, two Hoplias malabaricus karyomorphs (2n = 42A and 2n = 42B) live in sintopy in Carioca Lake. Cytogenetic analyses were performed on 65 specimens from 8 lakes (including Carioca L...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Ictiologia
|
| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200009&lng=en&tlng=en |
| _version_ | 1818484909300252672 |
|---|---|
| author | Uedson Pereira Jacobina Edson Paiva Jorge Abdala Dergam |
| author_facet | Uedson Pereira Jacobina Edson Paiva Jorge Abdala Dergam |
| author_sort | Uedson Pereira Jacobina |
| collection | DOAJ |
| description | The lacustrine system of the middle rio Doce basin is considered a paradigm of Pleistocene geomorphology. In these lakes, two Hoplias malabaricus karyomorphs (2n = 42A and 2n = 42B) live in sintopy in Carioca Lake. Cytogenetic analyses were performed on 65 specimens from 8 lakes (including Carioca Lake) to determine the distribution and relative frequency of these karyomorphs and the degree of cytogenetic divergence caused putatively by recent geographic isolation. All fish were 2n = 42B karyomorphs, except for 1 specimen from the Marola Lake, which was 2n = 42A. Among-population variation was especially high for C-banding patterns. Other characters such as X chromosome size and CMA3/DAPI also varied among populations. Our results suggested that the karyotype of H. malabaricus is able to respond rapidly to geographic isolation, and revealed that heterochromatic variation may represent the lowest hierarchical level of chromosomal evolution. |
| first_indexed | 2024-12-10T16:01:11Z |
| format | Article |
| id | doaj.art-e87286552fa14539b3119696751c175b |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-10T16:01:11Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-e87286552fa14539b3119696751c175b2022-12-22T01:42:24ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02249232533310.1590/S1679-62252011005000023S1679-62252011000200009Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern BrazilUedson Pereira Jacobina0Edson Paiva1Jorge Abdala Dergam2Universidade Federal de ViçosaUniversidade Federal de ViçosaUniversidade Federal de ViçosaThe lacustrine system of the middle rio Doce basin is considered a paradigm of Pleistocene geomorphology. In these lakes, two Hoplias malabaricus karyomorphs (2n = 42A and 2n = 42B) live in sintopy in Carioca Lake. Cytogenetic analyses were performed on 65 specimens from 8 lakes (including Carioca Lake) to determine the distribution and relative frequency of these karyomorphs and the degree of cytogenetic divergence caused putatively by recent geographic isolation. All fish were 2n = 42B karyomorphs, except for 1 specimen from the Marola Lake, which was 2n = 42A. Among-population variation was especially high for C-banding patterns. Other characters such as X chromosome size and CMA3/DAPI also varied among populations. Our results suggested that the karyotype of H. malabaricus is able to respond rapidly to geographic isolation, and revealed that heterochromatic variation may represent the lowest hierarchical level of chromosomal evolution.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200009&lng=en&tlng=enConservation geneticsKaryotype evolutionMiddle rio Doce ValleySympatry |
| spellingShingle | Uedson Pereira Jacobina Edson Paiva Jorge Abdala Dergam Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil Neotropical Ichthyology Conservation genetics Karyotype evolution Middle rio Doce Valley Sympatry |
| title | Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil |
| title_full | Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil |
| title_fullStr | Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil |
| title_full_unstemmed | Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil |
| title_short | Pleistocene karyotypic divergence in Hoplias malabaricus (Bloch, 1794) (Teleostei: Erythrinidae) populations in southeastern Brazil |
| title_sort | pleistocene karyotypic divergence in hoplias malabaricus bloch 1794 teleostei erythrinidae populations in southeastern brazil |
| topic | Conservation genetics Karyotype evolution Middle rio Doce Valley Sympatry |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200009&lng=en&tlng=en |
| work_keys_str_mv | AT uedsonpereirajacobina pleistocenekaryotypicdivergenceinhopliasmalabaricusbloch1794teleosteierythrinidaepopulationsinsoutheasternbrazil AT edsonpaiva pleistocenekaryotypicdivergenceinhopliasmalabaricusbloch1794teleosteierythrinidaepopulationsinsoutheasternbrazil AT jorgeabdaladergam pleistocenekaryotypicdivergenceinhopliasmalabaricusbloch1794teleosteierythrinidaepopulationsinsoutheasternbrazil |