Genetic homogeneity and historical expansions of the slipper lobster, Scyllarides brasiliensis, in the south-west Atlantic

Abstract

Abstract. Management strategies for fisheries species require understanding their connectivity and population dynamics. The Brazilian slipper lobster, Scyllarides brasiliensis, is one of the most commercially important slipper lobster species in South America. We investigated, for the first time, the population genetic structure and evolutionary history of this species. Analyses of sequences of the cytochrome oxidase I gene (COI) and the control region (CR) did not reveal any significant genetic structure of S. brasiliensis (N ¼ 202) along 2700 km of the Atlantic coast (COI:The genetic homogeneity found suggests high levels of gene flow along the area that are possibly related to the high dispersal potential of the planktonic larvae of the species. Furthermore, the data indicate that demographic and geographical expansions of this slipper lobster population have occurred during the late and middle Pleistocene, which could be related to the fluctuating environmental conditions of that period.

Population genetic structure of the shovel-nosed lobster Thenus unimaculatus (Decapoda, Scyllaridae) in Indian waters based on RAPD and mitochondrial gene sequences

“…Similar findings of genetically unstructured populations with molecular markers were reported in scyllarid lobsters (e.g. Froufe et al, 2011;Rodríguez-Rey et al, 2013) including T. unimaculatus (Wongruenpibool & Denduangboripant, 2013). In contrast to this, the presence of substantial genetic differentiation is also not unusual in lobsters (e.g.…”

“…The haplotype network with a most probable ancestral haplotype and more number of singletons again hinted that the population has recently expanded from a small number of founders following a population bottleneck (Slatkin & Hudson, 1991). The studies within other species of lobsters in the Mozambican and South African coasts have supported the idea that species and individual populations have undergone recent population expansions (Tolley et al, 2005;Naro-Maciel et al, 2011;Rodríguez-Rey et al, 2013).…”

“…The presence of a higher number of private haplotypes may be due to increased mutation rates, large female effective population sizes or a combination of these factors. These values indicated possibility of genetic bottleneck events, with subsequent population expansion and formation of new haplotypes in low frequencies as observed in the case of other slipper lobster species (Froufe et al, 2011;Rodríguez-Rey et al, 2013).…”

“…MtDNA markers were found to be efficient to detect population structure, genetic diversity and divergence times in slipper lobsters (e.g. Rodríguez-Rey et al, 2013). Except for the major works on biology, breeding and stock assessment, the population genetic structure analysis of wild shovel-nosed lobsters has not been undertaken so far in the country.…”

Variabilidade populacional em manguezais: análises moleculares e morfológicas em caranguejos Brachyura (Crustacea: Decapoda)

“…Se as larvas são capazes de se dispersar por longas distâncias, espera-se que elas não somente sejam agentes de colonização e recolonização, mas também de fluxo gênico entre populações amplamente separadas, de forma que esse fluxo seja amplamente controlado durante a fase larval planctônica por meio da interação da habilidade de dispersão larval e das correntes oceânicas (Scheltema, 1971;Hamasaki et al, 2015). Assim, a estruturação e conectividade populacional podem ser amplamente determinadas pela dispersão dos indivíduos (Rodríguez-Rey et al, 2014).…”