Cranial morphology and taxonomic resolution of some dolphin taxa (Delphinidae) in Australian waters, with a focus on the genus <i>Tursiops</i>

Jedensjö, Maria; Kemper, Catherine M.; Krützen, Michael

doi:10.1111/mms.12356

Cited by 12 publications

(11 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A particular conundrum surrounds the phylogenetic relationships among bottlenose-like dolphins (e.g., subfamily Delphininae), which also have experienced recent, rapid radiations (Steeman et al 2009;Slater et al 2010). Although some morphological (Shirakihara et al 2003;Guidarelli et al 2014Guidarelli et al , 2018Jedensjö et al 2017) and molecular (McGowen et al 2009(McGowen et al , 2020Chen et al 2011;Moura et al 2013Moura et al , 2020 analyses have been conducted, the evolutionary relationships among Delphininae generally have remained unclear. In particular, the monophyly of the genera Tursiops and Stenella is still under debate.…”

Section: Introductionmentioning

confidence: 99%

Extensive Interspecific Gene Flow Shaped Complex Evolutionary History and Underestimated Species Diversity in Rapidly Radiated Dolphins

et al. 2021

View full text Add to dashboard Cite

Recently diverged taxa are often characterized by high rates of hybridization, which can complicate phylogenetic reconstruction. For this reason, the phylogenetic relationships and evolutionary history of dolphins are still not very well resolved; the question of whether the genera Tursiops and Stenella are monophyletic is especially controversial. Here, we performed re-sequencing of six dolphin genomes and combined them with eight previously published dolphin SRA datasets and six whole-genome datasets to investigate the phylogenetic relationships of dolphins and test the monophyly hypothesis of Tursiops and Stenella. Phylogenetic reconstruction with the maximum likelihood and Bayesian methods of concatenated loci, as well as with coalescence analyses of sliding window trees, produced a concordant and well-supported tree. Our studies support the non-monophyletic status of Tursiops and Stenella because the species referred these genera do not form exclusive monophyletic clades. This suggests that the current taxonomy of both genera might not reflect their evolutionary history and may underestimate their diversity. A four-taxon D-statistic (ABBA-BABA) test, five-taxon DFOIL test, and tree-based PhyloNet analyses all showed extensive gene flow across dolphin species, which could explain the instability in resolving phylogenetic relationship of oceanic dolphins with different and limited markers. This study could be a good case to demonstrate how genomic data can reveal complex speciation and phylogeny in rapidly radiating animal groups.

show abstract

Section: Introductionmentioning

confidence: 99%

Extensive Interspecific Gene Flow Shaped Complex Evolutionary History and Underestimated Species Diversity in Rapidly Radiated Dolphins

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Whilst we acknowledge the validity of T . australis remains contentious [26, 27], since the initial species description [28], a larger body of genetic evidence further validates T . australis as a separate species, sister taxa to both Tursiops aduncas (Indo-Pacific bottlenose dolphin) and Tursiops truncatus (common bottlenose dolphin), using mtDNA regions [29], concatenated mtDNA/nuDNA sequences [30], the mitogenome [30–33], and more recently in the time calibrated molecular phylogeny of Certiodacyla [34].…”

Section: Methodsmentioning

confidence: 99%

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Foord¹,

Rowe

Robb³

2019

PLoS ONE

View full text Add to dashboard Cite

Cetacean stranding records can provide vital information on species richness and diversity through space and time. Here we collate stranding records from Victoria, Australia and assess them for temporal, spatial and demographic trends. Between 1920 and 2016, 424 stranding events involving 907 individuals were recorded across 31 Cetacea species from seven families, including five new species records for the state. Seven of these events were mass strandings, and six mother and calf strandings were recorded. Importantly, 48% of the species recorded are recognised as data deficient on the IUCN Red List. The most commonly recorded taxa were Tursiops spp. (n = 146) and Delphinus delphis (common dolphins, n = 81), with the greatest taxonomic richness (n = 24) and highest incidence of stranding events documented within the Otways mesoscale bioregion. We found no seasonal stranding patterns anywhere in the state. While our findings improve understanding of the spatial and temporal patterns of cetacean diversity within Victoria, we suggest greater effort to collect demographic data at stranding events in order to better study state-wide patterns through time. We conclude with guidelines for minimum data collection standards for future strandings to maximise information capture from each event.

show abstract

“…Evidence exists that T . australis is genetically distinct from other bottlenose dolphin species 14,19–21 , but morphological evidence is currently insufficient to confirm this 14,22 . We use only the term ‘bottlenose dolphins’ to refer to dolphins studied here, likely to be putative species T. australis due to its proximity to the coast and small school sizes.…”

Section: Introductionmentioning

confidence: 94%

Abundance estimates and habitat preferences of bottlenose dolphins reveal the importance of two gulfs in South Australia

Bilgmann

Parra

Holmes

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Informed conservation management of marine mammals requires an understanding of population size and habitat preferences. In Australia, such data are needed for the assessment and mitigation of anthropogenic impacts, including fisheries interactions, coastal zone developments, oil and gas exploration and mining activities. Here, we present large-scale estimates of abundance, density and habitat preferences of southern Australian bottlenose dolphins ( Tursiops sp.) over an area of 42,438km 2 within two gulfs of South Australia. Using double-observer platform aerial surveys over four strata and mark-recapture distance sampling analyses, we estimated 3,493 (CV = 0.21; 95%CI = 2,327-5,244) dolphins in summer/autumn, and 3,213 (CV = 0.20; 95%CI = 2,151-4,801) in winter/spring of 2011. Bottlenose dolphin abundance and density was higher in gulf waters across both seasons (0.09-0.24 dolphins/km 2 ) compared to adjacent shelf waters (0.004–0.04 dolphins/km 2 ). The high densities of bottlenose dolphins in the two gulfs highlight the importance of these gulfs as a habitat for the species. Habitat modelling associated bottlenose dolphins with shallow waters, flat seafloor topography, and higher sea surface temperatures (SSTs) in summer/autumn and lower SSTs in winter/spring. Spatial predictions showed high dolphin densities in northern and coastal gulf sections. Distributional data should inform management strategies, marine park planning and environmental assessments of potential anthropogenic threats to this protected species.

show abstract

Cranial morphology and taxonomic resolution of some dolphin taxa (Delphinidae) in Australian waters, with a focus on the genus Tursiops

Cited by 12 publications

References 58 publications

Extensive Interspecific Gene Flow Shaped Complex Evolutionary History and Underestimated Species Diversity in Rapidly Radiated Dolphins

Extensive Interspecific Gene Flow Shaped Complex Evolutionary History and Underestimated Species Diversity in Rapidly Radiated Dolphins

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Abundance estimates and habitat preferences of bottlenose dolphins reveal the importance of two gulfs in South Australia

Contact Info

Product

Resources

About