Different Ultimate Factors Define Timing of Breeding in Two Related Species

• Veli-Matti Pakanen ,

  * E-mail: veli-matti.pakanen@oulu.fi

  Affiliation Department of Ecology, University of Oulu, P. O. Box 3000, FIN-90014 University of Oulu, Oulu, Finland

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• Markku Orell,

  Affiliation Department of Ecology, University of Oulu, P. O. Box 3000, FIN-90014 University of Oulu, Oulu, Finland

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• Emma Vatka,

  Affiliation Department of Ecology, University of Oulu, P. O. Box 3000, FIN-90014 University of Oulu, Oulu, Finland

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• Seppo Rytkönen,

  Affiliation Department of Ecology, University of Oulu, P. O. Box 3000, FIN-90014 University of Oulu, Oulu, Finland

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• Juli Broggi

  Current address: Department of Biology, Section of Evolutionary Ecology, University of Lund, S-223 62 Lund, Sweden

  Affiliation Research Unit of Biodiversity, (UMIB, UO-CISC, PA). Ed. de Investigación 5ª C/ Gonzalo Gutiérrez Quirós s/n. 33600 Mieres, Spain

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