Figures & data
Table 1. Mean ± se of the number of feathers moulted in different feathers tracts, in addition to wing length (mm), by juvenile Common Chiffchaffs P. collybita wintering in two distant localities of the Iberian Peninsula. We show within brackets the relative proportions by locality for each group. The number of feathers only corresponds to one wing and half the tail. The alula complex includes the carpal covert. Total n = 269 (undetermined individuals: n = 59).
Figure 1. Changes across time in Moult scores of contour feathers of 269 juvenile Common Chiffchaffs wintering in two distant localities of the Iberian Peninsula (Málaga in the south, Barcelona in the north). Empty circles correspond to individuals from Málaga, while filled squares correspond to individuals from Barcelona. Mean values and standard errors are provided. Sample sizes for each point are shown within brackets. Within the square are highlighted the earliest migrants that could have reached southern localities across the season. It is probable that these individuals came from the Iberian Peninsula.
Table 2. Results of a general linear model using the number of contour feathers moulted by juvenile Common Chiffchaffs as dependent variable. We included locality (Málaga or Barcelona), sex (female or male), date, and their interactions as factors. Model fit: R2 = 0.20; F 1,209 = 10.0; P < 0.01.
Figure 2. Graph showing changes across time in Moult scores of flight feathers of 269 juvenile Common Chiffchaffs wintering in two distant localities of the Iberian Peninsula (Málaga in the south, Barcelona in the north). Empty circles correspond to individuals from Málaga, while filled squares correspond to individuals from Barcelona. Mean values and standard errors are provided. Sample sizes for each point are shown within brackets. Within the square are highlighted the earliest migrants that could reach southern localities across the season. It is probable that these individuals came from the Iberian Peninsula.
