Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-22T19:07:45Z No. of bitstreams: 1 DaviZalderMiguel_DISSERT.pdf: 1502899 bytes, checksum: 94c9394e8cd427632ad2ce016d4648df (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-06T22:44:11Z (GMT) No. of bitstreams: 1 DaviZalderMiguel_DISSERT.pdf: 1502899 bytes, checksum: 94c9394e8cd427632ad2ce016d4648df (MD5) / Made available in DSpace on 2017-03-06T22:44:11Z (GMT). No. of bitstreams: 1 DaviZalderMiguel_DISSERT.pdf: 1502899 bytes, checksum: 94c9394e8cd427632ad2ce016d4648df (MD5) 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.