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The Role of Geography and Ecological Opportunity in the Diversification of Day Geckos (Phelsuma)

Identifieur interne : 002A29 ( Istex/Corpus ); précédent : 002A28; suivant : 002A30

The Role of Geography and Ecological Opportunity in the Diversification of Day Geckos (Phelsuma)

Auteurs : Luke J. Harmon ; Jane Melville ; Allan Larson ; Jonathan B. Losos

Source :

RBID : ISTEX:5FD44DE9A65FF88DB3272F48869D783D9B6292E4

Abstract

We examine the effects of ecological opportunity and geographic area on rates of species accumulation and morphological evolution following archipelago colonization in day geckos (genus Phelsuma) in the Indian Ocean. Using a newly generated molecular phylogeny for the genus, we present evidence that these geckos likely originated on Madagascar, whereas colonization of three archipelagos in the Indian Ocean, the Seychelles, Mascarene, and Comoros Islands has produced three independent monophyletic radiations. We find that rates of species accumulation are not elevated following colonization but are roughly equivalent on all three isolated archipelagos and on the larger island of Madagascar. However, rates of species accumulation have slowed through time on Madagascar. Rates of morphological evolution are higher in both the Mascarene and Seychelles archipelagos compared to rates on Madagascar. This negative relationship between rate of morphological evolution and island area suggests that ecological opportunity is an important factor in diversification of day gecko species.

Url:
DOI: 10.1080/10635150802304779

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ISTEX:5FD44DE9A65FF88DB3272F48869D783D9B6292E4

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<affiliation>E-mail: lukeh@uidaho.edu</affiliation>
<affiliation>Biodiversity Centre, University of British Columbia Vancouver, BC V6T 1Z4, Canada</affiliation>
<affiliation>Department of Biology, Washington University St Louis, Missouri 63130, USA</affiliation>
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<name type="personal">
<namePart type="given">Jane</namePart>
<namePart type="family">Melville</namePart>
<affiliation>Department of Biology, Washington University St Louis, Missouri 63130, USA</affiliation>
<affiliation>Department of Sciences, Museum Victoria Melbourne, VIC 3001, Australia</affiliation>
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<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Allan</namePart>
<namePart type="family">Larson</namePart>
<affiliation>Department of Biology, Washington University St Louis, Missouri 63130, USA</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Jonathan B.</namePart>
<namePart type="family">Losos</namePart>
<affiliation>Museum of Comparative Zoology and Department of Organismal and Evolutionary Biology, Harvard University, 26 Oxford Street Cambridge, Massachusetts 02138, USA</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
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</name>
<name type="personal">
<namePart type="given">Todd</namePart>
<namePart type="family">Oakley</namePart>
<affiliation>Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844-3051, USA, Vancouver, BC V6T 1Z4, Canada, St Louis, Missouri 63130, USA, Melbourne, VIC 3001, Australia, Cambridge, Massachusetts 02138, USA</affiliation>
<affiliation>E-mail: lukeh@uidaho.edu</affiliation>
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<publisher>Taylor & Francis</publisher>
<dateIssued encoding="w3cdtf">2008-08</dateIssued>
<copyrightDate encoding="w3cdtf">2008</copyrightDate>
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<abstract>We examine the effects of ecological opportunity and geographic area on rates of species accumulation and morphological evolution following archipelago colonization in day geckos (genus Phelsuma) in the Indian Ocean. Using a newly generated molecular phylogeny for the genus, we present evidence that these geckos likely originated on Madagascar, whereas colonization of three archipelagos in the Indian Ocean, the Seychelles, Mascarene, and Comoros Islands has produced three independent monophyletic radiations. We find that rates of species accumulation are not elevated following colonization but are roughly equivalent on all three isolated archipelagos and on the larger island of Madagascar. However, rates of species accumulation have slowed through time on Madagascar. Rates of morphological evolution are higher in both the Mascarene and Seychelles archipelagos compared to rates on Madagascar. This negative relationship between rate of morphological evolution and island area suggests that ecological opportunity is an important factor in diversification of day gecko species.</abstract>
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<topic>Adaptive radiation</topic>
<topic>Indian Ocean</topic>
<topic>molecular phylogeny</topic>
<topic>speciation. rate of evolution</topic>
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<title>Systematic Biology</title>
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<genre type="journal">journal</genre>
<identifier type="ISSN">1063-5157</identifier>
<identifier type="eISSN">1076-836X</identifier>
<identifier type="PublisherID">sysbio</identifier>
<identifier type="PublisherID-hwp">sysbio</identifier>
<part>
<date>2008</date>
<detail type="volume">
<caption>vol.</caption>
<number>57</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>4</number>
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<extent unit="pages">
<start>562</start>
<end>573</end>
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<identifier type="DOI">10.1080/10635150802304779</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 2008 Society of Systematic Biologists</accessCondition>
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