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Previous issue date: 2016-02-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A hibridiza??o interespec?fica tem sido identificada em diversos grupos animais,
entre estes, de forma recorrente e destacadamente em peixes marinhos da
fam?lia Chaetodontidae. O g?nero Chaetodon ? o mais diverso da fam?lia com
cerca de 30 esp?cies capazes de produzir h?bridos vi?veis. Todas as
caracter?sticas pertinentes a este fen?meno v?m sendo analisadas, por?m
ainda s?o necess?rios mais dados sobre a quebra de barreiras reprodutivas
neste g?nero. No presente trabalho foram comparadas sequ?ncias dos genes
12S, 16S, RAG2 e NADH de esp?cies do g?nero Chaetodon com h?bridos
conhecidos, com o objetivo de aferir qual a dist?ncia gen?tica entre elas, bem
como compara??es citogen?ticas por mapeamento cromoss?mico das regi?es
de DNAr 18S e 5S das esp?cies C. striatus, C. capistratus e C. sedentarius, do
Atl?ntico Sul e Caribe. Os resultados indicam que as esp?cies parentais,
mesmo abrigando um alto n?vel de diverg?ncia gen?tica, mant?m o potencial
de intercruzamento e produz h?bridos vi?veis. Um extremo conservadorismo
cariot?pico inter e intra-espec?fico foi observado para as esp?cies. Apesar do
longo tempo decorrido de diverg?ncia entre algumas esp?cies, o potencial
reprodutivo interespec?fico, al?m de fatores ambientais e biol?gicos, pode ter
sido favorecido pela extensa homogeneidade cariot?pica presente na fam?lia. / Interspecific hybridization has been identified in various animal groups, among
these, on a recurring basis in marine fish, notably in the Chaetodontidae family.
The Chaetodon is the most diverse gender in the family, with about 30 species
able to produce viable hybrids. All relevant features of this phenomenon have
been analyzed, but we still need more data about the break of reproductive
barriers in this genre. In the present study were compared sequences of the
12S gene, 16S, rag2 and NADH of Chaetodon genus with produce known
hybrids, in order to ascertain what the genetic distance between them and
cytogenetic comparisons by chromosomal mapping of regions of rDNA 18S and
5S of C. striatus, C. sedentarius and C. capistratus, from South Atlantic and
Caribbean. The results indicate that parental species, even having a high level
of genetic divergence, maintains the potential intercross and are capable to
produce viable hybrids. An extreme conservatism karyotype inter- and intraspecific
was observed for the species. Despite the long interval of separation
between some species, interspecific reproductive potential as well an
environmental and biological factors may have been favored by extensive
karyotype homogeneity present in the family.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22149 |
| Date | 26 February 2016 |
| Creators | Miguel, Davi Zalder |
| Contributors | 56615043491, http://lattes.cnpq.br/8437464961129518, Costa, Gide?o Wagner Werneck Felix da, 03389191470, http://lattes.cnpq.br/8974329991208250, Lima Filho, Paulo Augusto de, 30720553865, http://lattes.cnpq.br/6923870491324619, Molina, Wagner Franco |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM SISTEM?TICA E EVOLU??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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