Habitat structure and the dispersal of male and female bottlenose dolphins (<i>Tursiops truncatus</i>)

Natoli, Ada; Birkun, Alexei; Aguilar, Àlex; López, Alfredo; Hoelzel, A. Rus

doi:10.1098/rspb.2005.3076

Cited by 203 publications

(280 citation statements)

References 53 publications

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“…Although capable of extensive dispersion (Stevick et al, 2002), many cetacean species show fine-scale genetic differentiation among populations (Hoelzel, 2009). In some cases there is a correlation between population structure and apparent habitat boundaries, as for the bottlenose dolphin (Tursiops truncatus) populations in European waters (Natoli et al, 2005) or with resource specializations as for the killer whale (Orcinus orca) populations in the North Pacific (Hoelzel et al, 2007). Environmental cycles releasing habitat or opening/closing dispersal corridors may also influence the evolution of population structure in these species (Amaral et al, 2012;Moura et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Phylogenomics of the killer whale indicates ecotype divergence in sympatry

et al. 2014

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For many highly mobile species, the marine environment presents few obvious barriers to gene flow. Even so, there is considerable diversity within and among species, referred to by some as the 'marine speciation paradox'. The recent and diverse radiation of delphinid cetaceans (dolphins) represents a good example of this. Delphinids are capable of extensive dispersion and yet many show fine-scale genetic differentiation among populations. Proposed mechanisms include the division and isolation of populations based on habitat dependence and resource specializations, and habitat release or changing dispersal corridors during glacial cycles. Here we use a phylogenomic approach to investigate the origin of differentiated sympatric populations of killer whales (Orcinus orca). Killer whales show strong specialization on prey choice in populations of stable matrifocal social groups (ecotypes), associated with genetic and phenotypic differentiation. Our data suggest evolution in sympatry among populations of resource specialists.

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Section: Introductionmentioning

confidence: 99%

Phylogenomics of the killer whale indicates ecotype divergence in sympatry

et al. 2014

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“…Among cetacean species, both killer whales (Orcinus orca) and bottlenose dolphins (Tursiops truncatus) show genetic differentiation among populations correlated to foraging specializations or habitat dependence (O. orca, Hoelzel et al, 2007;Moura et al, 2014;T. truncatus, Hoelzel et al, 1998;Natoli et al, 2005;Segura et al, 2006;CharltonRobb et al, 2011;Moura et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…There is also often genetic differentiation between coastal and pelagic populations, such as for the bottlenose dolphins in the North Atlantic and North Pacific (T. truncatus; see, for example, Natoli et al, 2005;Segura et al, 2006;Lowther-Thieleking et al, 2015) and for the eastern tropical Pacific pantropical spotted dolphins (Stenella attenuata; Escorza-Treviño et al, 2005). In some cases ecological phenotypes associated with habitat have been assigned specific status, such as the pelagic (T. truncatus) and coastal (Tursiops aduncus) forms of bottlenose dolphins in Asia (Wang et al, 1999) and Australasia (Möller and Beheregaray, 2001), and the riverine (Sotalia fluvitalis) and coastal (Sotalia guianensis) forms of the 'tucuxi' dolphin (Caballero et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Post-glacial habitat release and incipient speciation in the genus Delphinus

et al. 2016

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The role of ecological and changing environmental factors in the radiation of species diversity is a fundamental question in evolutionary biology. Of particular interest is the potential for these factors to determine the boundary between what we would consider differentiation among populations and incipient speciation. Dolphins in the genus Delphinus provide a useful test case, exhibiting morphological variation in beak length, coloration and body size across their wide geographic distribution, and in particular among coastal and more pelagic habitats. Two species have been proposed, D. delphis and D. capensis, but morphologically similar allopatric populations are not monophyletic, indicating that the mostly coastal 'long-beaked' D. capensis form is not a single globally distributed species. However, the sympatric populations in the Eastern North Pacific currently designated as these two species are both morphologically and genetically differentiated. Here we use microsatellite DNA and mitochondrial DNA markers to investigate the evolutionary mechanisms that led to this incipient speciation event. We used coalescent and assignment methods to investigate the timing and extent of reproductive isolation. Our data indicate that although there is some level of on-going gene flow, the putative species found in the Eastern North Pacific are reciprocally monophyletic. The timing of isolation appears to be associated with regional changes in paleoceanographic conditions within the Holocene timeframe.

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“…As mitochondrial genes are inherited from the mother, even complete mixing of males among groups will not affect population structure if females are completely philopatric (Birky et al 1983;Chesser & Baker 1996;Prugnolle & de Meeus 2002). Empirical differences in maternally versus paternally inherited genetic markers have been used to infer the amount of sex-specific migration in humans (Seielstad et al 1998;Wilder et al 2004), chimpanzees (Langergraber et al 2007) and other animals (Baker et al 1998;Natoli et al 2005;Eriksson et al 2006), so similar questions could be addressed using F ST for cultural traits. While innovation may be analogous to mutation, it is unclear how closely the various well-studied models of mutation would correspond to innovation when a trait can have one of many variants or be completely absent.…”

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confidence: 99%

The effect of innovation and sex-specific migration on neutral cultural differentiation

Yeaman¹,

Bshary²,

Lehmann³

2011

Animal Behaviour

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Keywords cultural trait population structure sex-biased migration sex-biased social learning Studies of behaviour are increasingly focusing on acquisition of traits through cultural inheritance. Comparison of patterns of spatial population structure (F ST ) between neutral genetic loci and behavioural or cultural traits can been used to test hypotheses about demography, life history, and the mechanisms of inheritance/transmission of these traits in humans, chimpanzees and other animals. Here, we develop analytical expectations to show how F ST in cultural traits can differ strongly from that measured at neutral genetic markers if migration is largely restricted to one sex but social learning is predominantly modelled on the other (e.g. males migrate, females serve as models for cultural traits), if one individual is the learning model for many, or if rates of innovation (individual learning) are high or rates of social learning are low. We discuss how comparisons of F ST between genetic loci and behavioural traits can be applied to evaluate the importance of innovation in shaping patterns of cultural differentiation, as even low rates of innovation can considerably reduce F ST , relative to observed structure at neutral genetic loci. Our results also suggest that differentiation in neutral cultural traits should occur over much smaller scales in species with male migration and female enculturation (or the reverse).

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Habitat structure and the dispersal of male and female bottlenose dolphins (Tursiops truncatus)

Cited by 203 publications

References 53 publications

Phylogenomics of the killer whale indicates ecotype divergence in sympatry

Phylogenomics of the killer whale indicates ecotype divergence in sympatry

Post-glacial habitat release and incipient speciation in the genus Delphinus

The effect of innovation and sex-specific migration on neutral cultural differentiation

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