This journal provides immediate access to some articles. Volume 273(1605); December 22, 2006 Editorial Research Articles Sexual selection predicts advancement of avian spring migration in response to climate change PMCID: PMC1679901 Testing hypotheses of Pleistocene population history using coalescent simulations: phylogeography of the pygmy nuthatch (Sitta pygmaea) PMCID: PMC1679902 Life history and environmental variation interact to determine effective population to census size ratio PMCID: PMC1679889 How do pathogen evolution and host heterogeneity interact in disease emergence? PMCID: PMC1679899 New insights into neuropeptide modulation of aggression: field studies of arginine vasotocin in a territorial tropical damselfish PMCID: PMC1679891 Recurrent replacement of mtDNA and cryptic hybridization between two sibling bat species Myotis myotis and Myotis blythii PMCID: PMC1679893 Spontaneous gene flow from rapeseed (Brassica napus) to wild Brassica oleracea PMCID: PMC1804201 Corrigenda Revised evidence for facultative sex ratio adjustment in birds: a correction PMCID: PMC1679897 Corrects: Revised evidence for facultative sex ratio adjustment in birds: a correction. Proc Biol Sci. 2006 December 22; 273(1605): 3129–3130. Evolutionary games and population dynamics: maintenance of cooperation in public goods games PMCID: PMC1679892 Corrects: Evolutionary games and population dynamics: maintenance of cooperation in public goods games. Proc Biol Sci. 2006 December 22; 273(1605): 3131–3132. | ||