Vol. 87 No. 4 (2010)

Research articles

• Female-biased sex ratios and the proportion of cryptic male morphs of migrant juvenile Ruffs (Philomachus pugnax) in Finland

  K. Jaatinen, A. Lehikoinen, D. B. Lank

  125–134

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• Sex allocation from an owl perspective: clutch order could determine brood sex to reduce sibling aggression in the Eagle Owl Bubo bubo

  V. Penteriani, M. M. Delgado, J. M. Perez-García, F. Botella, S. García, J. A. Sanchez Zapata, M. L. Ortega, J. E. Martinez, J. F. Calvo, J. Ortego, G. Penteriani, M. Melletti, I. Krugersberg, O. M.

  135–143

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• Temporal covariation of egg volume and breeding conditions in the Common Kestrel (Falco tinnunculus) in the Mediterranean region

  D. Costantini, L. Carello, G. Dell'Omo

  144–152

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• The influence of weather on birds wintering in the farmlands of eastern Poland

  A. Golawski, Z. Kasprzykowski

  153–159

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• Spring-season social organsization of the Hazel Grouse (Bonasa bonasia) in relation to habitat type in temperate forests of South Korea

  S.-J. Rhim

  160–167

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• Song divergence of two Bluethroat subspecies (Luscinia s. svecica and L. s. cyanecula)

  L. Turcokova, T. S. Osiejuk, V. Pavel, J. Glapan, T. Petruskova

  168–179

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• Medium-term response of breeding Blue Chaffinch Fringilla teydea teydea to experimental thinning in a Pinus canariensis plantation (Tenerife, Canary Islands)

  E. Garcia-del-Rey, R. Otto, J. M. Fernandez-Palacios

  180–188

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