Pelagic or insular? Genetic differentiation of rough-toothed dolphins in the Society Islands, French Polynesia

Oremus, Marc; Poole, M. Michael; Albertson, G. Renee; Baker, C. Scott

doi:10.1016/j.jembe.2012.06.027

Cited by 27 publications

(32 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This 'enhanced philopatry' could then lead to the striking geographic differentiation in mtDNA observed. A similar process of local fidelity has been proposed for insular communities of otherwise pelagic dolphins, due to an 'island mass' effect (Martien et al 2012;Oremus et al 2012).…”

Section: A Recent Worldwide Expansion Of Sperm Whalesmentioning

confidence: 55%

What influences the worldwide genetic structure of sperm whales (Physeter macrocephalus)?

et al. 2016

Self Cite

View full text Add to dashboard Cite

The interplay of natural selection and genetic drift, influenced by geographic isolation, mating systems and population size, determines patterns of genetic diversity within species. The sperm whale provides an interesting example of a long-lived species with few geographic barriers to dispersal. Worldwide mtDNA diversity is relatively low, but highly structured among geographic regions and social groups, attributed to female philopatry. However, it is unclear whether this female philopatry is due to geographic regions or social groups, or how this might vary on a worldwide scale. To answer these questions, we combined mtDNA information for 1091 previously published samples with 542 newly obtained DNA profiles (394-bp mtDNA, sex, 13 microsatellites) including the previously unsampled Indian Ocean, and social group information for 541 individuals. We found low mtDNA diversity (π = 0.430%) reflecting an expansion event <80 000 years bp, but strong differentiation by ocean, among regions within some oceans, and among social groups. In comparison, microsatellite differentiation was low at all levels, presumably due to male-mediated gene flow. A hierarchical amova showed that regions were important for explaining mtDNA variance in the Indian Ocean, but not Pacific, with social group sampling in the Atlantic too limited to include in analyses. Social groups were important in partitioning mtDNA and microsatellite variance within both oceans. Therefore, both geographic philopatry and social philopatry influence genetic structure in the sperm whale, but their relative importance differs by sex and ocean, reflecting breeding behaviour, geographic features and perhaps a more recent origin of sperm whales in the Pacific. By investigating the interplay of evolutionary forces operating at different temporal and geographic scales, we show that sperm whales are perhaps a unique example of a worldwide population expansion followed by rapid assortment due to female social organization.

show abstract

Section: A Recent Worldwide Expansion Of Sperm Whalesmentioning

confidence: 55%

What influences the worldwide genetic structure of sperm whales (Physeter macrocephalus)?

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The existence of genetic structure in S. bredanensis worldwide could be anticipated because the only previous genetic study on the species detected microscale population differentiation in French Polynesia (Oremus et al ., ). Restrictions to gene flow between two islands 170 km apart were observed using control region sequences (450 bp, F ST = 0.63, P < 0.001; Φ ST = 0.58, P < 0.001) and microsatellites (14 loci, F ST = 0.009, P < 0.001; R ST = 0.15, P < 0.05).…”

Section: Discussionmentioning

confidence: 97%

“…Allendorf & Luikart, ). The population structure of S. bredanensis has been studied only in French Polynesia, where genetic differentiation was observed between two islands 170 km apart (Oremus et al ., ). The results of that study suggest site fidelity with little dispersal between populations, which is relevant for their conservation.…”

Section: Introductionmentioning

confidence: 97%

Molecular taxonomy and population structure of the rough-toothed dolphinSteno bredanensis(Cetartiodactyla: Delphinidae)

et al. 2015

View full text Add to dashboard Cite

Several delphinid species have shown genetic population structure, both between and within ocean basins. We investigated genetic differentiation in the rough-toothed dolphin, Steno bredanensis, using mitochondrial control region sequences from several localities worldwide (N = 112). Preliminary analyses indicated high levels of genetic differentiation between the Atlantic and Pacific/Indian Oceans, which were further investigated using complete cytochrome b sequences and mitogenomes. Phylogenetic analyses were inconclusive about the existence of cryptic speciation in the genus Steno. Notwithstanding this result, analysis of molecular variance and Φ-statistics analyses revealed strong population differentiation not only between the Atlantic and Pacific, but also within the Atlantic, where three populations were detected: Caribbean, southeastern Brazil, and southern Brazil. We propose that these populations be considered management units for conservation purposes. Our results provide the first perspective on the worldwide genetic differentiation of S. bredanensis.

show abstract

“…; Oremus et al . ). This is most problematic if juveniles are sampled because they have had fewer opportunities to disperse, or because they obtain benefits from gregariousness (Wilson ).…”

Section: Introductionmentioning

confidence: 97%

“…To minimize this effect, population samples should adequately represent breeders in the putative populations of interest (Allendorf & Phelps 1981). In practice, however, this can be difficult to achieve, as closely related individuals aggregate in many species (Richard et al 1996;Hansen et al 1997;Oremus et al 2012). This is most problematic if juveniles are sampled because they have had fewer opportunities to disperse, or because they obtain benefits from gregariousness (Wilson 1975).…”

Section: Introductionmentioning

confidence: 99%

Inferring contemporary and historical genetic connectivity from juveniles

et al. 2016

View full text Add to dashboard Cite

Measuring population connectivity is a critical task in conservation biology. While genetic markers can provide reliable long-term historical estimates of population connectivity, scientists are still limited in their ability to determine contemporary patterns of gene flow, the most practical time frame for management. Here, we tackled this issue by developing a new approach that only requires juvenile sampling at a single time period. To demonstrate the usefulness of our method, we used the Speartooth shark (Glyphis glyphis), a critically endangered species of river shark found only in tropical northern Australia and southern Papua New Guinea. Contemporary adult and juvenile shark movements, estimated with the spatial distribution of kin pairs across and within three river systems, was contrasted with historical long-term connectivity patterns, estimated from mitogenomes and genome-wide SNP data. We found strong support for river fidelity in juveniles with the within-cohort relationship analysis. Male breeding movements were highlighted with the cross-cohort relationship analysis, and female reproductive philopatry to the river systems was revealed by the mitogenomic analysis. We show that accounting for juvenile river fidelity and female philopatry is important in population structure analysis and that targeted sampling in nurseries and juvenile aggregations should be included in the genomic toolbox of threatened species management.

show abstract

Pelagic or insular? Genetic differentiation of rough-toothed dolphins in the Society Islands, French Polynesia

Cited by 27 publications

References 69 publications

What influences the worldwide genetic structure of sperm whales (Physeter macrocephalus)?

What influences the worldwide genetic structure of sperm whales (Physeter macrocephalus)?

Molecular taxonomy and population structure of the rough-toothed dolphinSteno bredanensis(Cetartiodactyla: Delphinidae)

Inferring contemporary and historical genetic connectivity from juveniles

Contact Info

Product

Resources

About