Ecological character displacement in the face of gene flow: Evidence from two species of nightingales

Persistent Link:
http://hdl.handle.net/10150/610382
Title:
Ecological character displacement in the face of gene flow: Evidence from two species of nightingales
Author:
Reifova, Radka; Reif, Jiri; Antczak, Marcin; Nachman, Michael
Affiliation:
Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic; Institute for Environmental Studies, Faculty of Science, Charles University, Prague, Czech Republic; Department of Zoology and Laboratory of Ornithology, Faculty of Science, Palacký University, Olomouc, Czech Republic; Department of Behavioural Ecology, Adam Mickiewicz University, Poznan, Poland; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, USA
Issue Date:
2011
Publisher:
BioMed Central
Citation:
Reifová et al. BMC Evolutionary Biology 2011, 11:138 http://www.biomedcentral.com/1471-2148/11/138
Journal:
BMC Evolutionary Biology
Rights:
© 2011 Reifová et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0)
Collection Information:
This item is part of the UA Faculty Publications collection. For more information this item or other items in the UA Campus Repository, contact the University of Arizona Libraries at repository@u.library.arizona.edu.
Abstract:
BACKGROUND:Ecological character displacement is a process of phenotypic differentiation of sympatric populations caused by interspecific competition. Such differentiation could facilitate speciation by enhancing reproductive isolation between incipient species, although empirical evidence for it at early stages of divergence when gene flow still occurs between the species is relatively scarce. Here we studied patterns of morphological variation in sympatric and allopatric populations of two hybridizing species of birds, the Common Nightingale (Luscinia megarhynchos) and the Thrush Nightingale (L. luscinia).RESULTS:We conducted principal component (PC) analysis of morphological traits and found that nightingale species converged in overall body size (PC1) and diverged in relative bill size (PC3) in sympatry. Closer analysis of morphological variation along geographical gradients revealed that the convergence in body size can be attributed largely to increasing body size with increasing latitude, a phenomenon known as Bergmann's rule. In contrast, interspecific interactions contributed significantly to the observed divergence in relative bill size, even after controlling for the effects of geographical gradients. We suggest that the divergence in bill size most likely reflects segregation of feeding niches between the species in sympatry.CONCLUSIONS:Our results suggest that interspecific competition for food resources can drive species divergence even in the face of ongoing hybridization. Such divergence may enhance reproductive isolation between the species and thus contribute to speciation.
EISSN:
1471-2148
DOI:
10.1186/1471-2148-11-138
Version:
Final published version
Additional Links:
http://www.biomedcentral.com/1471-2148/11/138

Full metadata record

DC FieldValue Language
dc.contributor.authorReifova, Radkaen
dc.contributor.authorReif, Jirien
dc.contributor.authorAntczak, Marcinen
dc.contributor.authorNachman, Michaelen
dc.date.accessioned2016-05-20T09:05:33Z-
dc.date.available2016-05-20T09:05:33Z-
dc.date.issued2011en
dc.identifier.citationReifová et al. BMC Evolutionary Biology 2011, 11:138 http://www.biomedcentral.com/1471-2148/11/138en
dc.identifier.doi10.1186/1471-2148-11-138en
dc.identifier.urihttp://hdl.handle.net/10150/610382-
dc.description.abstractBACKGROUND:Ecological character displacement is a process of phenotypic differentiation of sympatric populations caused by interspecific competition. Such differentiation could facilitate speciation by enhancing reproductive isolation between incipient species, although empirical evidence for it at early stages of divergence when gene flow still occurs between the species is relatively scarce. Here we studied patterns of morphological variation in sympatric and allopatric populations of two hybridizing species of birds, the Common Nightingale (Luscinia megarhynchos) and the Thrush Nightingale (L. luscinia).RESULTS:We conducted principal component (PC) analysis of morphological traits and found that nightingale species converged in overall body size (PC1) and diverged in relative bill size (PC3) in sympatry. Closer analysis of morphological variation along geographical gradients revealed that the convergence in body size can be attributed largely to increasing body size with increasing latitude, a phenomenon known as Bergmann's rule. In contrast, interspecific interactions contributed significantly to the observed divergence in relative bill size, even after controlling for the effects of geographical gradients. We suggest that the divergence in bill size most likely reflects segregation of feeding niches between the species in sympatry.CONCLUSIONS:Our results suggest that interspecific competition for food resources can drive species divergence even in the face of ongoing hybridization. Such divergence may enhance reproductive isolation between the species and thus contribute to speciation.en
dc.language.isoenen
dc.publisherBioMed Centralen
dc.relation.urlhttp://www.biomedcentral.com/1471-2148/11/138en
dc.rights© 2011 Reifová et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0)en
dc.titleEcological character displacement in the face of gene flow: Evidence from two species of nightingalesen
dc.typeArticleen
dc.identifier.eissn1471-2148en
dc.contributor.departmentDepartment of Zoology, Faculty of Science, Charles University, Prague, Czech Republicen
dc.contributor.departmentInstitute for Environmental Studies, Faculty of Science, Charles University, Prague, Czech Republicen
dc.contributor.departmentDepartment of Zoology and Laboratory of Ornithology, Faculty of Science, Palacký University, Olomouc, Czech Republicen
dc.contributor.departmentDepartment of Behavioural Ecology, Adam Mickiewicz University, Poznan, Polanden
dc.contributor.departmentDepartment of Ecology and Evolutionary Biology, University of Arizona, Tucson, USAen
dc.identifier.journalBMC Evolutionary Biologyen
dc.description.collectioninformationThis item is part of the UA Faculty Publications collection. For more information this item or other items in the UA Campus Repository, contact the University of Arizona Libraries at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
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