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Natural selection for earlier male arrival to breeding grounds through direct and indirect effects in a migratory songbird

Velmala, William, Helle, Samuli, Ahola, Markus P., Klaassen, Marcel, Lehikoinen, Esa, Rainio, Kalle, Sirkiä, Paivi M. and Laaksonen, Toni 2015, Natural selection for earlier male arrival to breeding grounds through direct and indirect effects in a migratory songbird, Ecology and evolution, vol. 5, no. 6, pp. 1205-1213, doi: 10.1002/ece3.1423.

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Title Natural selection for earlier male arrival to breeding grounds through direct and indirect effects in a migratory songbird
Author(s) Velmala, William
Helle, Samuli
Ahola, Markus P.
Klaassen, MarcelORCID iD for Klaassen, Marcel orcid.org/0000-0003-3907-9599
Lehikoinen, Esa
Rainio, Kalle
Sirkiä, Paivi M.
Laaksonen, Toni
Journal name Ecology and evolution
Volume number 5
Issue number 6
Start page 1205
End page 1213
Total pages 9
Publisher Wiley Open Access
Place of publication Oxford, Eng.
Publication date 2015-03
ISSN 2045-7758
Keyword(s) Fitness
life history
microevolution
seasonal interactions
sexual selection
timing of migration
Summary For migratory birds, the earlier arrival of males to breeding grounds is often expected to have fitness benefits. However, the selection differential on male arrival time has rarely been decomposed into the direct effect of male arrival and potential indirect effects through female traits. We measured the directional selection differential on male arrival time in the pied flycatcher (Ficedula hypoleuca) using data from 6 years and annual number of fledglings as the fitness proxy. Using structural equation modeling, we were able to take into account the temporal structure of the breeding cycle and the hierarchy between the examined traits. We found directional selection differentials for earlier male arrival date and earlier female laying date, as well as strong selection differential for larger clutch size. These selection differentials were due to direct selection only as indirect selection for these traits was nonsignificant. When decomposing the direct selection for earlier male arrival into direct and indirect effects, we discovered that it was almost exclusively due to the direct effect of male arrival date on fitness and not due to its indirect effects via female traits. In other words, we showed for the first time that there is a direct effect of male arrival date on fitness while accounting for those effects that are mediated by effects of the social partner. Our study thus indicates that natural selection directly favored earlier male arrival in this flycatcher population.
Language eng
DOI 10.1002/ece3.1423
Field of Research 060201 Behavioural Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Wiley Open Access
Persistent URL http://hdl.handle.net/10536/DRO/DU:30072452

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.