Electrophoretic characterization of a hybrid between Eretmochelys imbricata and Caretta caretta (Cheloniidae)

Conceição, Moisés Basílio da; Levy, J.A.; Marins, Luís Fernando; Marcovaldi, Maria Ângela

doi:10.1016/0305-0491(90)90280-7

Cited by 32 publications

(26 citation statements)

References 9 publications

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“…Reptilian lineages have been found to diverge from one another at significantly (perhaps eightfold) lower rates than mammalian ones (1,4). Most of the seven marine turtle species are able to mate and produce viable hybrid offspring (6,15,37), indicating that they share substantial genetic similarity. Further FPTHV sequencing and a larger cross-species sample set will be required to resolve this issue.…”

Section: Discussionmentioning

confidence: 99%

Genomic Variation of the Fibropapilloma-Associated Marine Turtle Herpesvirus across Seven Geographic Areas and Three Host Species

Greenblatt

Quackenbush

Casey

et al. 2005

J Virol

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Section: Discussionmentioning

confidence: 99%

Genomic Variation of the Fibropapilloma-Associated Marine Turtle Herpesvirus across Seven Geographic Areas and Three Host Species

Greenblatt

Quackenbush

Casey

et al. 2005

J Virol

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“…Although hybridization events have previously been reported for marine turtles (Conceição et al 1990;Bowen et al 1992Bowen et al , 1994Karl et al 1995;Bass et al 1996;Bowen and Karl 1996;Lara-Ruiz et al 2006), this work is the first notification of hybridization between C. caretta and L. olivacea on the Brazilian coast.…”

Section: Introductionmentioning

confidence: 85%

Evidence of olive ridley mitochondrial genome introgression into loggerhead turtle rookeries of Sergipe, Brazil

2009

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The coastline of Sergipe state hosts the main Brazilian nesting sites of Lepidochelys olivacea (Eschscholtz, 1829). The second most abundant species of turtles in Sergipe is Caretta caretta (Linnaeus, 1758). Both sea turtle species, respectively known as olive ridley and loggerhead, are currently listed as endangered by the International Union for the Conservation of Nature and Natural Resources. The genetic diversity of the Sergipe loggerhead population (N = 51) was assayed by analyzing 627 bp from the control region of mitochondrial DNA in nesting females. Three haplotypes were identified: CC-A4, CC-A24 and CC 9 LO. The last one was recorded for specimens considered hybrids because they represent L. olivacea's mtDNA, but had the external morphology of C. caretta or of a mixture of both species. Based on the two types of hybrids, it was hypothesized that at least two hybridization events had occurred: a more ancient hybridization event, accompanied by introgression (F2 or later backcrosses), and a recent one (F1), both of which involving the same L. olivacea haplotype. The incidence of L. olivacea mitochondrial genome introgression into the C. caretta rookeries was only observed in Sergipe, which could be related to the large numbers of L. olivacea in this region and an overlap of reproduction periods and distribution areas of both species. This may also be associated to global warming since it might alter the sex ratio of sea turtles, thus facilitating interspecific mating. Awareness of gene flow between these species will significantly influence the development and implementation of adequate management strategies.

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“…These preliminary analyses revealed six haplotypes (384 bp), and a high proportion (10 of 14 samples) of loggerhead Â hawksbill hybrids (morphologically diagnosed hawksbills with loggerhead mtDNA haplotypes). Evidence of hybridization was first reported by Conceic¸a˜o et al (1990), who identified a likely loggerheadÂhawksbill hybrid in this same population using protein electrophoresis. Despite this hybridization reports, a study on loggerheads from nesting grounds in Brazil did not registered any hawksbill mtDNA haplotypes in 81 loggerhead samples (Soares 2004).…”

Section: Introductionmentioning

confidence: 92%

Extensive hybridization in hawksbill turtles (Eretmochelys imbricata) nesting in Brazil revealed by mtDNA analyses

et al. 2006

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Bahia state hosts over 90% of hawksbill (Eretmochelys imbricata) nests registered in the main nesting sites monitored by Projeto Tamar-IBAMA in Brazil. The genetic diversity of this hawksbill population (n=119) was assayed through the analyses of 752 bp of the mitochondrial DNA control region in nesting females. Seven distinct haplotypes, defined by 125 polymorphic sites, were found. Most of the individuals (n=67) display four typical hawksbill haplotypes, 50 individuals display two haplotypes characteristic of the loggerhead turtle (Caretta caretta) and two individuals had a haplotype affiliated with the olive ridley (Lepidochelys olivacea). These results demonstrate hybridization between the hawksbills and two species that nest along the Bahia coast. Of special interest is the high occurrence of loggerhead Â hawksbill hybrids (42%), which display loggerhead mtDNA haplotypes but are characterized morphologically as hawksbills. The true hawksbill haplotypes present only three variable sites and low genetic diversity values (h=0.358±0.069; p=0.0005±0.0001). The occurrence of several nesting individuals with identical mtDNA from another species may also suggest a long history of introgression between species producing likely F2 or further generation hybrids. Marine turtle hybrids have been previously reported, but the high frequency observed in Bahia is unprecedented. Such introgression may influence evolutionary pathways for all three species, or may introduce novel morphotypes that develop apart from the parental species. The presence of a unique hybrid swarm has profound conservation implications and will significantly influence the development and implementation of appropriate management strategies for these species.

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Electrophoretic characterization of a hybrid between Eretmochelys imbricata and Caretta caretta (Cheloniidae)

Cited by 32 publications

References 9 publications

Genomic Variation of the Fibropapilloma-Associated Marine Turtle Herpesvirus across Seven Geographic Areas and Three Host Species

Genomic Variation of the Fibropapilloma-Associated Marine Turtle Herpesvirus across Seven Geographic Areas and Three Host Species

Evidence of olive ridley mitochondrial genome introgression into loggerhead turtle rookeries of Sergipe, Brazil

Extensive hybridization in hawksbill turtles (Eretmochelys imbricata) nesting in Brazil revealed by mtDNA analyses

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