CiteULike

Delicious

Connotea

Citation for Study 10124

Citation title: "Radiation of Extant Cetaceans Driven by Restructuring of the Oceans".

This study was previously identified under the legacy study ID S2467 (Status: Published).

Citation

Steeman M., Hebsgaard M., Fordyce R., Ho S., Rabosky D., Nielsen R., Rahbek C., Glenner H., S?rensen M., & Willerslev E. 2009. Radiation of Extant Cetaceans Driven by Restructuring of the Oceans. Systematic Biology, 58(6): 573-585.

Authors

• Steeman M.
• Hebsgaard M.
• Fordyce R.
• Ho S.
• Rabosky D.
• Nielsen R.
• Rahbek C.
• Glenner H.
• S?rensen M.
• Willerslev E.

Abstract

The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true of the radiation of modern whales. Here, we explore the diversification of extant cetaceans by constructing a robust molecular phylogeny that includes 87 of 89 extant species. The phylogeny and divergence times are derived from nuclear and mitochondrial markers, calibrated with fossils. We find that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36-34 million years ago (Ma). The rorqual family (Balaenopteridae) is restored with the exclusion of the gray whale, suggesting that gulp-feeding evolved 18-16 Ma. Delphinida, comprising all living dolphins and porpoises other than the Ganges/Indus dolphins, originated about 26 Ma; it contains the taxonomically rich delphinids, which began diversifying less than 11 Ma. We tested two hypothesized drivers of the extant cetacean radiation by assessing the tempo of lineage accumulation through time. We find no support for a rapid burst of speciation early in the history of extant whales, contrasting with expectations of an adaptive-radiation model. However, we do find support for increased diversification rates during periods of pronounced physical restructuring of the oceans. The results imply that paleogeographic and paleoceanographic changes, such as closure of major seaways, have influenced the dynamics of radiation in extant cetaceans.

External links

• DOI: 10.1093/sysbio/syp060

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S10124
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref18615,
  	 author = {M. E.  Steeman and Martin Bay  Hebsgaard and R. Ewan  Fordyce and Simon  Ho and D. L.  Rabosky and Rasmus  Nielsen and Carsten  Rahbek and Henrik  Glenner and Martin V  S?rensen and Eske  Willerslev},
  	 title = {Radiation of Extant Cetaceans Driven by Restructuring of the Oceans},
  	 year = {2009},
  	 keywords = {},
  	 doi = {10.1093/sysbio/syp060},
  	 url = {},
  	 pmid = {},
  	 journal = {Systematic Biology},
  	 volume = {58},
  	 number = {6},
  	 pages = {573--585},
  	 abstract = {The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true of the radiation of modern whales. Here, we explore the diversification of extant cetaceans by constructing a robust molecular phylogeny that includes 87 of 89 extant species. The phylogeny and divergence times are derived from nuclear and mitochondrial markers, calibrated with fossils. We find that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36-34 million years ago (Ma). The rorqual family (Balaenopteridae) is restored with the exclusion of the gray whale, suggesting that gulp-feeding evolved 18-16 Ma. Delphinida, comprising all living dolphins and porpoises other than the Ganges/Indus dolphins, originated about 26 Ma; it contains the taxonomically rich delphinids, which began diversifying less than 11 Ma. We tested two hypothesized drivers of the extant cetacean radiation by assessing the tempo of lineage accumulation through time. We find no support for a rapid burst of speciation early in the history of extant whales, contrasting with expectations of an adaptive-radiation model. However, we do find support for increased diversification rates during periods of pronounced physical restructuring of the oceans. The results imply that paleogeographic and paleoceanographic changes, such as closure of major seaways, have influenced the dynamics of radiation in extant cetaceans.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 18615
  AU  - Steeman,M. E. 
  AU  - Hebsgaard,Martin Bay 
  AU  - Fordyce,R. Ewan 
  AU  - Ho,Simon 
  AU  - Rabosky,D. L. 
  AU  - Nielsen,Rasmus 
  AU  - Rahbek,Carsten 
  AU  - Glenner,Henrik 
  AU  - S?rensen,Martin V 
  AU  - Willerslev,Eske 
  T1  - Radiation of Extant Cetaceans Driven by Restructuring of the Oceans
  PY  - 2009
  UR  - http://dx.doi.org/10.1093/sysbio/syp060
  N2  - The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true of the radiation of modern whales. Here, we explore the diversification of extant cetaceans by constructing a robust molecular phylogeny that includes 87 of 89 extant species. The phylogeny and divergence times are derived from nuclear and mitochondrial markers, calibrated with fossils. We find that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36-34 million years ago (Ma). The rorqual family (Balaenopteridae) is restored with the exclusion of the gray whale, suggesting that gulp-feeding evolved 18-16 Ma. Delphinida, comprising all living dolphins and porpoises other than the Ganges/Indus dolphins, originated about 26 Ma; it contains the taxonomically rich delphinids, which began diversifying less than 11 Ma. We tested two hypothesized drivers of the extant cetacean radiation by assessing the tempo of lineage accumulation through time. We find no support for a rapid burst of speciation early in the history of extant whales, contrasting with expectations of an adaptive-radiation model. However, we do find support for increased diversification rates during periods of pronounced physical restructuring of the oceans. The results imply that paleogeographic and paleoceanographic changes, such as closure of major seaways, have influenced the dynamics of radiation in extant cetaceans.
  L3  - 10.1093/sysbio/syp060
  JF  - Systematic Biology
  VL  - 58
  IS  - 6
  SP  - 573
  EP  - 585
  ER  -