relative moult of remex

Fig. 1. Temporal coincidence of moult of primaries, secondaries and rectrices in Dunlin from the Öresund area, S Sweden, in late summer and autumn. Approximate weight of 10 primaries = 2W, 14 secondaries = W, 6 rectrices = 0.5W; W order of magnitude = 100 mg. Birds moulting in September may shed outer secondaries with P4 or P5, otherwise they are shed with P6 or, preferably, with P7.









moult regressions

Fig. 2. Regressions TIME on SCORE for the same material as "moult score" (Ginn & Melville 1983) and as "percentage primary mass grown" (cf. Summers et al. 1983). All categories pooled: birds with grey medians, "adult buff" medians and "droplet" primary coverts; scores 0 and 50 (100) not included.









2c and 3c+ moulting ratio

Fig. 3. Ratio of moulting 2c (n=468) and 3c+ (n=887) Dunlin on the Falsterbo peninsula, from pentade 10 - 14.7 (1) to 14 - 18.8 (8). 1 s.e. drawn from each value. Late summer mean values for both categories shown with dashed lines, sample size given for each pentade and category.









2c/3c+ rank

Fig. 4. Ratio of ranking 0 in 3c+ and 2c Dunlin from Falsterbo peninsula 15 - 19.7 (I) to 9 - 13.8 (VI), n(3c+) = 643, n(2c) = 342. 1 s.e. drawn from each value. Cf. Table I in "Migratory progress of juvenile..."









PPMG in 2c/3c+

Fig. 5. Percentage primary mass grown (PPMG) in Dunlin from the Falsterbo peninsula in July and August 1995-2004. Intervals: I = 12 - 21 July, II = 22 - 31 July, III = 1 - 10 Aug, IV 11 - 20 Aug, V = 21 - 30 Aug. Horizontal line = mean value, bar = 1 s.e., vertical line = 1 s.d.; 2c = white bar, 3c+ = black bar. Sample size stated next to each line, total n = 505. Birds with "adult buff" medians or "droplet" primary coverts not included.




abc moult regression

Fig. 6. Percentage primary mass grown (PPMG) in Dunlin with "adult buff" medians and/or "droplet" primary coverts from the Falsterbo peninsula, July - October 1995-2004; 1 July = TIME 1. Birds with PPMG = 0 (no moult) and 100 (fresh) included in the calculations; n = 114. Regression equation: TIME = 22.2 +0.49 PPMG; F = 286.9, p < 0.001, R-Sq(adj) = 71.7 %. Regression line from Fig. 7 shown dashed.




grey median moult regression

Fig. 7. Percentage primary mass grown (PPMG) in Dunlin with grey medians from the Falsterbo peninsula, July - October 1995-2004; 1 July = TIME 1. Birds with PPMG = 0 (no moult) and 100 (fresh) included in the calculations; n = 1489. Regression equation: TIME = 27.3 +0.61 PPMG; F = 4132, p < 0.001, R-Sq(adj) = 73.5 %. One bird increased its PPMG from appr. 21.9 to 54.9 between 1.9 and 20.9 (estimated duration of remige moult: 57.5 days), the two points are connected with a line. Regression line from Fig. 6 shown dashed.









2cgaps

.Fig. 8. Wing gaps in 2c Dunlin on the Falsterbo peninsula July - September, 1995 - 2004, n = 274. Score "0" = initiated moult + perfect suspension. Gap measured in tenths of full length of mainly primaries 1 - 8. Median position shown with arrow. Birds with "adult buff" medians or "droplet" primary coverts not included.









3c+gaps

Fig. 9. Wing gaps in 3c+ Dunlin on the Falsterbo peninsula July - September, 1995 - 2004, n = 205. Score "0" = initiated moult + perfect suspension. Gap measured in tenths of full length of mainly primaries 1 - 8. Median position shown with arrow. Birds with "adult buff" medians or "droplet" primary coverts not included.









wing gap frequency on time

Fig. 10. Frequency of wing gaps plotted against time in adult Dunlin, Falsterbo peninsula, July - September 1995 - 2005. N = 635; score "0" = initiated moult + perfect suspension. 1 July = Time 1. Gap measured in tenths of full length of mainly primaries 1 - 7(8). Birds with "adult buff" medians or "droplet" primary coverts not included.



time distribution of moulted birds

Fig. 11. Time distribution of 97 birds, migrating with fresh remiges, 25 August - 26 October. "Adult buff" and grey median coverts pooled. Median 26 September. These birds are forming the top edge (PPMG = 100) of figs. 6 and 7.



Additions to Fig. 10 10.4.06, Fig. 11 added 16.9.10.