Fecundity selection does not vary along a large geographical cline of trait means in a passerine bird |
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| Authors: | Päivi M Sirkiä Peter Adamík Alexandr V Artemyev Eugen Belskii Christiaan Both Stanislav Bureš Malcolm Burgess Andrey V Bushuev Jukka T Forsman Vladimir Grinkov Dieter Hoffmann Antero Järvinen Miroslav Král Indrikis Krams Helene M Lampe Juan Moreno Marko Mägi Andreas Nord Jaime Potti Pierre‐Alain Ravussin Leonid Sokolov Toni Laaksonen |
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| Institution: | 1. Department of Biology, Section of Ecology, University of Turku, Turku, Finland;2. Finnish Museum of Natural History, Zoology Unit, University of Helsinki, Helsinki, Finland;3. Department of Zoology and Laboratory of Ornithology, Palacky University, Olomouc, Czech Republic;4. Institute of Biology, Karelian Research Centre, Russian Academy of Science, Petrozavodsk, Russia;5. Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Science, Ekaterinburg, Russia;6. Centre for Ecological and Evolutionary Studies, University of Groningen, Haren, The Netherlands;7. Centre for Research in Animal Behaviour, School of Life & Environmental Sciences, University of Exeter, Exeter, UK;8. Department of Vertebrate Zoology, Faculty of Biology, Moscow State University, Moscow, Russia;9. Department of Biology, University of Oulu, Oulu, Finland;10. Harthausen, Germany;11. Kilpisj?rvi Biological Station, University of Helsinki, Helsinki, Finland;12. Val??v D?l, Dlouhá Lou?ka, Czech Republic;13. Institute of Systematic Biology, University of Daugavpils, Daugavpils, Latvia;14. Centre for Ecological and Evolutionary Synthesis, University of Oslo, Oslo, Norway;15. Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales‐CSIC, Madrid, Spain;16. Institute of Ecology and Earth Sciences, Department of Zoology, University of Tartu, Tartu, Estonia;17. Department of Biology, Section of Evolutionary Ecology, Lund University, Lund, Sweden;18. Department of Evolutionary Ecology, Estación Biológica de Do?ana‐CSIC, Sevilla, Spain;19. Rue du Theu, Baulmes, Switzerland;20. Biological Station of the Zoological Institute, Russian Academy of Science, Rybachy, Russia |
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| Abstract: | Local environmental and ecological conditions are commonly expected to result in local adaptation, although there are few examples of variation in phenotypic selection across continent‐wide spatial scales. We collected standardized data on selection with respect to the highly variable plumage coloration of pied flycatcher (Ficedula hypoleuca Pall.) males from 17 populations across the species' breeding range. The observed selection on multiple male coloration traits via the annual number of fledged young was generally relatively weak. The main aim of the present study, however, was to examine whether the current directional selection estimates are associated with distance to the sympatric area with the collared flycatcher (Ficedula albicollis Temminck), a sister species with which the pied flycatcher is showing character displacement. This pattern was expected because plumage traits in male pied flycatchers are changing with the distance to these areas of sympatry. However, we did not find such a pattern in current selection on coloration. There were no associations between current directional selection on ornamentation and latitude or longitude either. Interestingly, current selection on coloration traits was not associated with the observed mean plumage traits of the populations. Thus, there do not appear to be geographical gradients in current directional fecundity selection on male plumage ornamentation. The results of the present study do not support the idea that constant patterns in directional fecundity selection would play a major role in the maintenance of coloration among populations in this species. By contrast, the tendency for relatively weak mosaic‐like variation in selection among populations could reflect just a snapshot of temporally variable, potentially environment‐dependent, selection, as suggested by other studies in this system. Such fine‐grained variable selection coupled with gene flow could maintain extensive phenotypic variation across populations. © 2015 The Linnean Society of London, Biological Journal of the Linnean Society, 2015, 114 , 808–827. |
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| Keywords: | coloration fitness melanin ornamentation phenotype plumage spatial variation |
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