Biometrics, sexing and moulting of Snow Finch Montifringilla nivalis in Central Italy

摘要: As a small passerine typical of several Palaearctic mountain ranges, the Snow Finch Montifringilla nivalis is susceptible to climate change and studies into its ecology are badly needed. Data on biometric measurements moult parameters essential underpin ecological aim this study was provide such data for central Italian breeding population. Between 2003 2009, 404 individuals were ringed measured. In majority morphometric (wing length, eighth primary length [P8], bill depth, mass) adults significantly larger than juveniles. Adult males had longer wings females, but sexes similar all other size parameters. Differences in wing could be used sex safely 88% adult individuals. Wing P8 influenced by feather abrasion, which more pronounced females reduced 2 mm summer compared winter. The duration estimated ...