Name: Fernanda Lopes Teixeira
Type: MSc dissertation
Publication date: 19/05/2021
Advisor:
Name |
Role |
|---|---|
| Ana Paula Cazerta Farro | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| Ana Paula Cazerta Farro | Advisor * |
| Larissa Rosa de Oliveira | External Examiner * |
| Mario Manoel Rollo Junior | External Examiner * |
| Salvatore Siciliano | External Alternate * |
Summary: Pantropical-spotted-dolphin (Stenella attenuata Gray 1846) occurs in temperate
and tropical waters of the Atlantic, Pacific and Indian oceans. To evaluate the
genetic diversity and population structure of the species on the Brazilian coast
and to compare these results with those obtained for other locations, 28
specimens were sequenced for the mitochondrial DNA control region and 125
GenBank haplotypes were added in the analyzes from five locations the Eastern
Tropical Pacific (92), four locations the Hawaii (12), Solomon Islands (14) and the
North Atlantic Ocean (7). In addition, ten microsatellite loci were evaluated for 20
specimens from the Santos Basin in Brazil. In the Brazilian coast, nine haplotypes
were found, high values of haplotypic diversity (Northeast: 0.93 +/- 0.12; South /
Southeast: 0.70 +/- 0.06) and from moderate to low nucleotide diversity
(Northeast: 0.027 +/- 0.02; South / Southeast: 0.007 +/- 0.00). For microsatellite
loci, the observed heterozygosity values ranged from 0.450 to 0.950 and
expected heterozygosity from 0.619 to 0.942. It was evidenced that the
pantropical-spotted-dolphins of the Southwest Atlantic Ocean have high levels of
genetic diversity and that in this region there are at least two distinct populations,
with differentiation between the other ocean basins evaluated. This study
presents the first genetic data for the species in the South Atlantic. The continuity
of this study is important so that the area of distribution can be better represented.
KEYWORDS
conservation, Delphinidae, D-loop, microsatellite, genetic variability
