Recent Diversification of a Marine Genus (Tursiops spp.) Tracks Habitat Preference and Environmental Change
MetadataShow full item record
Understanding the evolution of diversity and the resulting systematics in marine systems is confounded by the lack of clear boundaries in oceanic habitats, especially for highly mobile species like marine mammals. Dolphin populations and sibling species often show differentiation between coastal and offshore habitats, similar to the pelagic/littoral or benthic differentiation seen for some species of fish. Here we test the hypothesis that lineages within the polytypic genus Tursiops track past changes in the environment reflecting ecological drivers of evolution facilitated by habitat release. We used a known recent time point for calibration (the opening of the Bosphorus) and whole mitochondrial genome (mitogenome) sequences for high phylogenetic resolution. The pattern of lineage formation suggested an origin in Australasia and several early divisions involving forms currently inhabiting coastal habitats. Radiation in pelagic environments was relatively recent, and was likely followed by a return to coastal habitat in some regions. The timing of some nodes defining different ecotypes within the genus clustered near the two most recent interglacial transitions. A signal for an increase in diversification was also seen for dates after the last glacial maximum. Together these data suggest the tracking of habitat preference during geographic expansions, followed by transition points reflecting habitat shifts, which were likely associated with periods of environmental change. [Climatic oscillations; marine mammal; pleistocene; radiation; speciation.]
Showing items related by title, author, creator and subject.
Environmental DNA (eDNA) metabarcoding reveals strong discrimination among diverse marine habitats connected by water movementJeunen, G.; Knapp, M.; Spencer, H.; Lamare, M.; Taylor, H.; Stat, M.; Bunce, Michael; Gemmell, N. (2018)While in recent years environmental DNA (eDNA) metabarcoding surveys have shown great promise as an alternative monitoring method, the integration into existing marine monitoring programs may be confounded by the dispersal ...
Village-Based Marine Resource Use and Rural Livelihoods:Kimbe Bay, West New Britain, Papua New GuineaKoczberski, Gina; Curry, George; Warku, J.; Kwam, C. (2006)This report presents the findings of a socio-economic study conducted in six coastal villages in Kimbe Bay, West New Britain Province, Papua New Guinea. From west to east around the Bay the study villages were Kulungi, ...
Tin, H.; O'Leary, Mick; Fotedar, Ravi; Garcia, R. (2016)© 2015 MTS.Marine submerged aquatic vegetation (SAV) plays a vital role as habitats, nursery and feeding grounds for a wide range of marine aquatic and terrestrial life. Recently, remote sensing techniques have been ...