Radiation of Extant Cetaceans Driven by Restructuring of the Oceans
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 for the radiation of modern whales. Here, we explore the diversification o...
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fthighwire:oai:open-archive.highwire.org:sysbio:58/6/573 2023-05-15T18:33:32+02:00 Radiation of Extant Cetaceans Driven by Restructuring of the Oceans Steeman, Mette E. Hebsgaard, Martin B. Fordyce, R. Ewan Ho, Simon Y. W. Rabosky, Daniel L. Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V. Willerslev, Eske 2009-12-01 00:00:00.0 text/html http://sysbio.oxfordjournals.org/cgi/content/short/58/6/573 https://doi.org/10.1093/sysbio/syp060 en eng Oxford University Press http://sysbio.oxfordjournals.org/cgi/content/short/58/6/573 http://dx.doi.org/10.1093/sysbio/syp060 Copyright (C) 2009, Society of Systematic Biologists Regular Articles TEXT 2009 fthighwire https://doi.org/10.1093/sysbio/syp060 2013-05-27T12:41:40Z 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 for 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 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 2 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. Text toothed whales HighWire Press (Stanford University) Rorqual ENVELOPE(-62.311,-62.311,-65.648,-65.648) Systematic Biology 58 6 573 585 |
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HighWire Press (Stanford University) |
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English |
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Regular Articles |
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Regular Articles Steeman, Mette E. Hebsgaard, Martin B. Fordyce, R. Ewan Ho, Simon Y. W. Rabosky, Daniel L. Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V. Willerslev, Eske Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
topic_facet |
Regular Articles |
description |
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 for 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 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 2 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. |
format |
Text |
author |
Steeman, Mette E. Hebsgaard, Martin B. Fordyce, R. Ewan Ho, Simon Y. W. Rabosky, Daniel L. Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V. Willerslev, Eske |
author_facet |
Steeman, Mette E. Hebsgaard, Martin B. Fordyce, R. Ewan Ho, Simon Y. W. Rabosky, Daniel L. Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V. Willerslev, Eske |
author_sort |
Steeman, Mette E. |
title |
Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
title_short |
Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
title_full |
Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
title_fullStr |
Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
title_full_unstemmed |
Radiation of Extant Cetaceans Driven by Restructuring of the Oceans |
title_sort |
radiation of extant cetaceans driven by restructuring of the oceans |
publisher |
Oxford University Press |
publishDate |
2009 |
url |
http://sysbio.oxfordjournals.org/cgi/content/short/58/6/573 https://doi.org/10.1093/sysbio/syp060 |
long_lat |
ENVELOPE(-62.311,-62.311,-65.648,-65.648) |
geographic |
Rorqual |
geographic_facet |
Rorqual |
genre |
toothed whales |
genre_facet |
toothed whales |
op_relation |
http://sysbio.oxfordjournals.org/cgi/content/short/58/6/573 http://dx.doi.org/10.1093/sysbio/syp060 |
op_rights |
Copyright (C) 2009, Society of Systematic Biologists |
op_doi |
https://doi.org/10.1093/sysbio/syp060 |
container_title |
Systematic Biology |
container_volume |
58 |
container_issue |
6 |
container_start_page |
573 |
op_container_end_page |
585 |
_version_ |
1766218150378995712 |