Effective population size and the genetic consequences of commercial whaling on the humpback whales (Megaptera novaeangliae) from Southwestern Atlantic Ocean
AUTOR(ES)
Cypriano-Souza, Ana Lúcia, da Silva, Tiago Ferraz, Engel, Márcia H., Bonatto, Sandro L.
FONTE
Genet. Mol. Biol.
DATA DE PUBLICAÇÃO
2018
RESUMO
Abstract Genotypes of 10 microsatellite loci of 420 humpback whales from the Southwestern Atlantic Ocean population were used to estimate for the first time its contemporary effective (Ne) and census (Nc) population sizes and to test the genetic effect of commercial whaling. The results are in agreement with our previous studies that found high genetic diversity for this breeding population. Using an approximate Bayesian computation approach, the scenario of constant Ne was significantly supported over scenarios with moderate to strong size changes during the commercial whaling period. The previous generation Nc (Ne multiplied by 3.6), which should corresponds to the years between around 1980 and 1990, was estimated between ~2,600 and 6,800 whales (point estimate ~4,000), and is broadly compatible with the recent abundance surveys extrapolated to the past using a growth rate of 7.4% per annum. The long-term Nc in the constant scenario (point estimate ~15,000) was broadly compatible (considering the confidence interval) with pre-whaling catch records estimates (point estimate ~25,000). Overall, our results shown that the Southwestern Atlantic Ocean humpback whale population is genetically very diverse and resisted well to the strong population reduction during commercial whaling.
Documentos Relacionados
- The surface features of the brain of the humpback whale (Megaptera novaeangliae)
- Caracterização temporal da estrutura de grupos e do comportamento de baleias jubarte (Megaptera novaeangliae) na área de reprodução da região do Arquipélago dos Abrolhos (Bahia, Brasil).
- Padrões de movimento das baleias-jubarte (Megaptera novaeangliae) reocupando uma área reprodutiva brasileira
- What do humpback whales Megaptera novaeangliae (Cetartiodactyla: Balaenopteridae) pairs do after tagging?
- Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine mammals in the La Plata River Basin