Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna

 

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dc.contributor.author Fuchs, Jerome en_ZA
dc.contributor.author Pons, Jean-Marc en_ZA
dc.contributor.author Goodman, Steven en_ZA
dc.contributor.author Bretagnolle, Vincent en_ZA
dc.contributor.author Melo, Martim en_ZA
dc.contributor.author Bowie, Rauri en_ZA
dc.contributor.author Currie, David en_ZA
dc.contributor.author Safford, Roger en_ZA
dc.contributor.author Virani, Munir en_ZA
dc.contributor.author Thomsett, Simon en_ZA
dc.contributor.author Hija, Alawi en_ZA
dc.contributor.author Cruaud, Corinne en_ZA
dc.contributor.author Pasquet, Eric en_ZA
dc.date.accessioned 2015-10-28T07:02:59Z
dc.date.available 2015-10-28T07:02:59Z
dc.date.issued 2008 en_ZA
dc.identifier.citation Fuchs, J., Pons, J. M., Goodman, S. M., Bretagnolle, V., Melo, M., Bowie, R. C., ... & Pasquet, E. (2008). Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna. BMC Evolutionary Biology, 8(1), 197. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/14461
dc.identifier.uri http://dx.doi.org/10.1186/1471-2148-8-197
dc.description.abstract BACKGROUND:The island of Madagascar and surrounding volcanic and coralline islands are considered to form a biodiversity hotspot with large numbers of unique taxa. The origin of this endemic fauna can be explained by two different factors: vicariance or over-water-dispersal. Deciphering which factor explains the current distributional pattern of a given taxonomic group requires robust phylogenies as well as estimates of divergence times. The lineage of Indian Ocean scops-owls (Otus: Strigidae) includes six or seven species that are endemic to Madagascar and portions of the Comoros and Seychelles archipelagos; little is known about the species limits, biogeographic affinities and relationships to each other. In the present study, using DNA sequence data gathered from six loci, we examine the biogeographic history of the Indian Ocean scops-owls. We also compare the pattern and timing of colonization of the Indian Ocean islands by scops-owls with divergence times already proposed for other bird taxa. RESULTS: Our analyses revealed that Indian Ocean islands scops-owls do not form a monophyletic assemblage: the Seychelles Otus insularis is genetically closer to the South-East Asian endemic O. sunia than to species from the Comoros and Madagascar. The Pemba Scops-owls O. pembaensis, often considered closely related to, if not conspecific with O. rutilus of Madagascar, is instead closely related to the African mainland O. senegalensis. Relationships among the Indian Ocean taxa from the Comoros and Madagascar are unresolved, despite the analysis of over 4000 bp, suggesting a diversification burst after the initial colonization event. We also highlight one case of putative back-colonization to the Asian mainland from an island ancestor (O. sunia). Our divergence date estimates, using a Bayesian relaxed clock method, suggest that all these events occurred during the last 3.6 myr; albeit colonization of the Indian Ocean islands were not synchronous, O. pembaensis diverged from O. senegalensis about 1.7 mya while species from Madagascar and the Comoro diverged from their continental sister-group about 3.6 mya. We highlight that our estimates coincide with estimates of diversification from other bird lineages. CONCLUSION: Our analyses revealed the occurrence of multiple synchronous colonization events of the Indian Ocean islands by scops-owls, at a time when faunistic exchanges involving Madagascar was common as a result of lowered sea-level that would have allowed the formation of stepping-stone islands. Patterns of diversification that emerged from the scops-owls data are: 1) a star-like pattern concerning the order of colonization of the Indian Ocean islands and 2) the high genetic distinctiveness among all Indian Ocean taxa, reinforcing their recognition as distinct species. en_ZA
dc.language.iso eng en_ZA
dc.publisher BioMed Central Ltd en_ZA
dc.rights This is an Open Access article distributed under the terms of the Creative Commons Attribution License en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/2.0 en_ZA
dc.source BMC Evolutionary Biology en_ZA
dc.source.uri http://www.biomedcentral.com/bmcevolbiol/ en_ZA
dc.subject.other Ornithology en_ZA
dc.subject.other Evolutionary Biology en_ZA
dc.title Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna en_ZA
dc.type Journal Article en_ZA
dc.rights.holder 2008 Fuchs et al; licensee BioMed Central Ltd. en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Percy FitzPatrick Institute of African Ornithology en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Fuchs, J., Pons, J., Goodman, S., Bretagnolle, V., Melo, M., Bowie, R., ... Pasquet, E. (2008). Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna. <i>BMC Evolutionary Biology</i>, http://hdl.handle.net/11427/14461 en_ZA
dc.identifier.chicagocitation Fuchs, Jerome, Jean-Marc Pons, Steven Goodman, Vincent Bretagnolle, Martim Melo, Rauri Bowie, David Currie, et al "Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna." <i>BMC Evolutionary Biology</i> (2008) http://hdl.handle.net/11427/14461 en_ZA
dc.identifier.vancouvercitation Fuchs J, Pons J, Goodman S, Bretagnolle V, Melo M, Bowie R, et al. Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna. BMC Evolutionary Biology. 2008; http://hdl.handle.net/11427/14461. en_ZA
dc.identifier.ris TY - Journal Article AU - Fuchs, Jerome AU - Pons, Jean-Marc AU - Goodman, Steven AU - Bretagnolle, Vincent AU - Melo, Martim AU - Bowie, Rauri AU - Currie, David AU - Safford, Roger AU - Virani, Munir AU - Thomsett, Simon AU - Hija, Alawi AU - Cruaud, Corinne AU - Pasquet, Eric AB - BACKGROUND:The island of Madagascar and surrounding volcanic and coralline islands are considered to form a biodiversity hotspot with large numbers of unique taxa. The origin of this endemic fauna can be explained by two different factors: vicariance or over-water-dispersal. Deciphering which factor explains the current distributional pattern of a given taxonomic group requires robust phylogenies as well as estimates of divergence times. The lineage of Indian Ocean scops-owls (Otus: Strigidae) includes six or seven species that are endemic to Madagascar and portions of the Comoros and Seychelles archipelagos; little is known about the species limits, biogeographic affinities and relationships to each other. In the present study, using DNA sequence data gathered from six loci, we examine the biogeographic history of the Indian Ocean scops-owls. We also compare the pattern and timing of colonization of the Indian Ocean islands by scops-owls with divergence times already proposed for other bird taxa. RESULTS: Our analyses revealed that Indian Ocean islands scops-owls do not form a monophyletic assemblage: the Seychelles Otus insularis is genetically closer to the South-East Asian endemic O. sunia than to species from the Comoros and Madagascar. The Pemba Scops-owls O. pembaensis, often considered closely related to, if not conspecific with O. rutilus of Madagascar, is instead closely related to the African mainland O. senegalensis. Relationships among the Indian Ocean taxa from the Comoros and Madagascar are unresolved, despite the analysis of over 4000 bp, suggesting a diversification burst after the initial colonization event. We also highlight one case of putative back-colonization to the Asian mainland from an island ancestor (O. sunia). Our divergence date estimates, using a Bayesian relaxed clock method, suggest that all these events occurred during the last 3.6 myr; albeit colonization of the Indian Ocean islands were not synchronous, O. pembaensis diverged from O. senegalensis about 1.7 mya while species from Madagascar and the Comoro diverged from their continental sister-group about 3.6 mya. We highlight that our estimates coincide with estimates of diversification from other bird lineages. CONCLUSION: Our analyses revealed the occurrence of multiple synchronous colonization events of the Indian Ocean islands by scops-owls, at a time when faunistic exchanges involving Madagascar was common as a result of lowered sea-level that would have allowed the formation of stepping-stone islands. Patterns of diversification that emerged from the scops-owls data are: 1) a star-like pattern concerning the order of colonization of the Indian Ocean islands and 2) the high genetic distinctiveness among all Indian Ocean taxa, reinforcing their recognition as distinct species. DA - 2008 DB - OpenUCT DO - 10.1186/1471-2148-8-197 DP - University of Cape Town J1 - BMC Evolutionary Biology LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna TI - Tracing the colonization history of the Indian Ocean scops-owls (Strigiformes: Otus) with further insight into the spatio-temporal origin of the Malagasy avifauna UR - http://hdl.handle.net/11427/14461 ER - en_ZA


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