Sex-biased survival and breeding dispersal probability in a patchy population of the Rock Sparrow Petronia petronia

摘要: Demographic parameters of the polygynous Rock Sparrow Petronia petronia were investigated in a small patchy population Italian Alps. The included two distinct breeding patches that differed altitude and success. Survival estimated by capture‐recapture analysis 170 individually marked animals. At whole level (Cormack‐Jolly Seber model), no sex difference local survival probability was detected. We then used multisite approach (Arnason‐ Schwarz model) to investigate patch-specific between-patch dispersal rate conditional on survival. Female higher-altitude patch (mean ± se: 0.54 0.04) significantly greater than other (0.37 0.04), probably because permanent emigration from study area greater. In higheraltitude patch, constrained limit movements directed toward at lower altitude. changing next season higher for females (range 0.16‐0.21) males (0.01‐0.03). Breeding success varied between years patches, being where frequency polygamy female mortality higher.