Estruturação genética de Stenella coeruleoalba Meyen, 1833 no Oceano Atlântico
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Data
2017-04-07
Autores
Freire, Mylla Carla Cescon
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Universidade Federal do Espírito Santo
Resumo
The Stenella coeruleoalba is a small pelagic cetacean from the Delphininae family that is widely distributed and can be found in tropical and temperate waters of the Atlantic, Pacific and Indian Oceans, as well as in adjacent seas, such as the Mediterranean Sea. The present study aimed to analyze the cytochrome b (Cit-b) region and the control region (Dloop) of the mitochondrial DNA of individuals from the Northeast and South of Brazil (South Atlantic Ocean), as well as comparing them with Sequences of striped dolphins from the North Atlantic Ocean, and with that to evaluate the diversity indexes and the presence or absence of genetic structuring between the different localities. The S. coeruleoalba of Brazil presented a high genetic diversity for both mitochondrial markers analyzed (D-loop: h = 0.984, π = 0.294, Cit-b: h = 0.848, π = 0.249) Two populations (FST = 0.180, P = 0.045). A significant difference between the sample units of S. coeruleoalba of the North Atlantic and South Atlantic was verified from the two mitochondrial markers evaluated (D-loop: FST = 0.034 / P = 0.009; Cit-b: FST = 0.130 / P = 0.026). In addition, with the D-loop region, it was possible to evidence genetic structure between two groups of striped dolphins of the Mediterranean Sea (FST = 0.0913 / P = 0.000). It was not found structuring between the individuals of the western North Atlantic Ocean with the sample units of Brazil, even though these did not present haplotype sharing. This fact suggests that these units may have arisen from genetically close lineages and are still part of the same population. Until then, no population genetic study with the S. coeruleoalba species had been carried out in the South Atlantic Ocean. Understanding how the striped dolphins are structured is of paramount importance in order to understand the genetics of these individuals and thus to define adequate conservation strategies for each species.
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Cytochrome b , Genetic diversity , Striped dolphin , D-loop , Delphininae , Citocromo b , Diversidade genética , DNA , Golfinho listrado
Citação
FREIRE, Mylla Carla Cescon. Estruturação genética de Stenella Coeruleoalba (Meyen, 1833) no Oceano Atlântico. 2017. Dissertação (Mestrado em Biodiversidade Tropical) - Universidade Federal do Espírito Santo, Centro Universitário Norte do Espírito Santo, São Mateus, 2017.