Abstract
The taxonomic status of humpback dolphins (genus Sousa, sub-family Delphininae) is unresolved. While the classification of this genus ranges from a single to three nominal species, the International Union for Conservation of Nature and the International Whaling Commission only recognise a ‘two-species’ taxonomy (S. teuszii in west Africa, and S. chinensis in the Indo-Pacific). Under the IUCN (2008), S. chinensis is listed as ‘near threatened’, but is only considered as a ‘migratory’ species in Australia. Taxonomic resolution of the genus Sousa is needed to define particular conservation status and develop appropriate management actions. Using phylogenetic analyses of 1,082 bp of mitochondrial and 1,916 bp of nuclear DNA, we provide multiple lines of genetic evidence for the genetic distinction of S. chinensis in China and Indonesia from S. chinensis in Australia. The separation of Australian Sousa from Sousa of Southeast Asia requires a review of their current conservation status and respective management actions.
References
Amaral AR, Sequeira M, Martinez-Cedeira J, Coelho MM (2007) New insights on population genetic structure of Delphinus delphis from the northeast Atlantic and phylogenetic relationships within the genus inferred from two mitochondrial markers. Mar Biol 151:1967–1976
Avise JC (2000) Phylogeography: the history and formation of species. Harvard University Press, Cambridge
Baker CS, Perry A, Bannister JL et al (1993) Abundant mitochondrial-DNA variation and worldwide population-structure in humpback whales. Proc Natl Acad Am 90:8239–8243
Beasley I, Robertson KM, Arnold P (2005) Description of a new dolphin, the Australian snubfin Orcaella heinsohni sp. n. (Cetacea, Delphinidae). Mar Mamm Sci 21:365–400
Bloomquist EW, Lemey P, Suchard AM (2010) Three roads diverged? Routes to phylogeographic inference. Trends Ecol Evol 25(11):626–632
Cagnazzi DDD, Harrison PL, Ross GJB et al (2009) Abundance and site fidelity of Indo-Pacific humpback dolphins in the Great Sandy Strait, Queensland, Australia. Mar Mamm Sci 27(2):255–281
Caballero S, Trujillo F, Vianna JA, Barrios-Garrido H, Montiel MG, et al (2007) Taxonomic status of the genus Sotalia: species level ranking for tucuxi (Sotalia fluviatilis) and costero (Sotalia guianensis) dolphins. Mar Mamm Sci 23:358–386
Dalebout ML, Steel D, Baker S (2008) Phylogeny of the beaked whale genus Mesoplodon (Ziphiidae: Cetacea) Revealed by Nuclear Introns: implications for the evolution of male tusks. Syst Biol 57:857–875
Davis JI, Nixon KC (1992) Populations, genetic variation and the delimitation of phylogenetic species. Syst Biol 41:421–435
Davis LG, Dibner MD, Battey JF (1986) Basic methods in molecular biology, 1st edn. Elsevier, New York
Dawbin WH (1972) Dolphins and whales. In: Ryan P (ed) Encyclopaedia of Papua. Melbourne University Pres, New Guinea, pp 270–276
Frère CH, Hale PT, Porter L, Cockcroft VG, Dalebout ML (2008) Phylogenetic analysis of mtDNA sequences suggests revision of humpback dolphin (Sousa spp.) taxonomy is needed. Mar Freshw Res 59:259–268
Hickerson MJ, Carstens BC, Cavender-Bares J et al (2010) Phylogeography’s past, present, and future: 10 years after Avise, 2000. Mol Phylogenet Evol 54:291–301
Huelsenbeck JP, Ronquist F (2001) MRBAYES: Bayesian inference of phylogenetic trees. Bioinformatics 17:754–755
Jefferson TA, Van Waerebeek K (2004) Geographic variation in skull morphology of humpback dolphins (Sousa spp.). Aquat Mamm 30:3–17
Knowles LL (2009) Statistical phylogeography. Annu Rev Ecol Evol Syst 40:593–612
Krützen M, Sherwin WB, Berggren P, Gales NJ (2004) Population structure in an inshore cetacean revealed by microsatellite and mtDNA analysis: bottlenose dolphins (Tursiops spp.) in Shark Bay, Western Australia. Mar Mamm Sci 20:28–47
LeDuc RG, Perrin WF, Dizon AE (1999) Phylogenetic relationships among the delphinid cetaceans based on full cytochrome B sequences. Mar Mamm Sci 13:619–648
Lyons LA, Laughlin TF, Copeland NG et al (1997) Comparative anchor tagged sequences (CATS) for integrative mapping of mammalian genomes. Nat Genet 15:47–56
Mace GM (2004) The role of taxonomy in species conservation. Philosophical Transactions of the Royal Society of London Series B-Biological Sciences 359:711–719
Milinkovitch MC, Le Duc R, Tiedemann R, Dizon A (2002) Applications of molecular data in cetacean taxonomy and population genetics with special emphasis on defining species boundaries. In: Evans PGH, Raga JA (eds) Marine mammals: biology and conservation. Kluwer Academic-Plenum Publishers, Dordrecht, NY, pp 325–359
Moritz C (1994) Defining evolutionary significant units for conservation. Tree 9:373–375
Moritz C (2002) Strategies to protect biological diversity and the evolutionary processes that sustain it. Syst Biol 51:238–254
Palumbi SR, Baker CS (1994) Contrasting population structure from nuclear intron sequences and mtDNA of humpback whales. Mol Biol Evol 11:426–435
Parra G, Ross GJB (2009) Humpback dolphins. In: Perrin WF, Wursig B, Thewissen JGM (eds) Encyclopedia of marine mammals. Academic Press, San Diego
Parra GJ, Corkeron PJ, Marsh H (2004) The Indo-Pacific humpback dolphin, Sousa chinensis (Osbeck, 1765), in Australian waters: a summary of current knowledge. Aquat Mamm 30:197–206
Parra GJ, Corkeron PJ, Marsh E (2006a) Population sizes, site fidelity and residence patterns of Australian snubfin and Indo-Pacific humpback dolphins: implications for conservation. Biol Conserv 129:167–180
Parra GJ, Schick R, Corkeron PJ (2006b) Spatial distribution and environmental correlates of Australian snubfin and Indo-Pacific humpback dolphins. Ecography 29:396–406
Penny D, Hendy MD (1985) The use of tree comparison metrics. Syst Zool 34:75–82
Perrin WF, Reeves RR, Dolar MLL, Jefferson TA, Marsh H, Wang JY, et al (eds) (2005) Report on the second workshop on the biology and conservation of small Cetaceans and Dugongs of Southeast Asia. Convention on Migratory Species (CMS) Technical Series publication no. 9, UNEP/CMS Secretariat, Bonn, Germany
Posada D (2008) jModelTest: phylogenetic model averaging. Mol Biol Evol 25:1253–1256
Posada D, Buckley TR (2004) Model selection and model averaging in phylogenetics: advantages of Akaike information criterion and Bayesian approaches over likelihood ratio tests. Syst Biol 53:793–808
Rannala B, Yang Z (1996) Probability distribution of molecular evolutionary trees: a new method of phylogenetic inference. Mol Evol 43:304–311
Roca AL, Georgiadis N, Pecon-Slattery J, O’Brien SJ (2001) Genetic evidence for two species of elephant in Africa. Science 293:1473–1477
Rodrigues MT, Pavan D, Curcio FF (2007) Two new species of lizards of the genus Bachia (Squamata, Gymnophthalmidae) from Central Brazil. J Herpetol 41:545–553
Schluter D (2009) Evidence for ecological speciation and its alternative. Science 323:737–741
Sulaiman ZH, Ovenden JR (2010) Population genetic evidence for the east–west division of the narrow-barred Spanish mackerel (Scomberomorus commerson, Perciformes: Teleostei) along Wallace’s line. Biodivers Conserv 19:563–574
Swofford DL (2003) PAUP*: phylogenetic analysis using parsimony (*and other methods), version 4. Sinauer Associates, Sunderland
Thompson JN (2009) Which ecologically important traits are most likely to evolve rapidly? Oikos 118:1281–1283
Wolf JBW, Lindell J, Backström N (2009) Speciation genetics: current status and evolving approaches. Phil Trans Royal Soc B 365:1717–1733
Zwickl DJ (2006) Genetic algorithm approaches for the phylogenetic analysis of large biological sequence datasets under the maximum likelihood criterion. The University of Texas, Austin
Acknowledgments
The research was carried out under permit no. 33838 issued by Northern Territories Parks and Wildlife. Ethics approval was given from The University of Charles Darwin (no. A06016). The study was funded with grants to GJP from Flinders University. The samples from Hong Kong were collected as part of a strandings program funded by the Agriculture, Fisheries and Conservation Department of the Hong Kong SAR Government. We thank Daniel Kreb and the National Marine Fisheries Service, USA for the Indonesian Sousa DNA sample.
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Frère, C.H., Seddon, J., Palmer, C. et al. Multiple lines of evidence for an Australasian geographic boundary in the Indo-Pacific humpback dolphin (Sousa chinensis): population or species divergence?. Conserv Genet 12, 1633–1638 (2011). https://doi.org/10.1007/s10592-011-0242-9
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DOI: https://doi.org/10.1007/s10592-011-0242-9