Moerdijk Field Research 2005-2006
(last update: 14 August 2010)
Roland-Jan Buijs
Theo Muusse
Mars Muusse
Introduction
Methods
Age, origin & sex
Retrapped Birds
Upperparts Greytone
Black on Primary Coverts
Black on Primaries
P10 and P9 Patterns
P5 Pattern
Red & Black on Bill
Iris & Orbital Ring
Primary Moult
Discussion
References
Primary Moult Scores in May for actively moulting Herring Gulls (top boxplot; n = 160, out of 314 birds)
and Lesser Black-backed Gulls (bottom boxplot; n = 187, out of 997 birds).
01 May = day 1.
o: Outliers.
*: Extremes.
Numbers of actively moulting birds in % along X-axis.
LBBG showing arrested moult not in this figure, for they are not in ‘active moult’.
On day 23, 11 LBBG were all scored PMS0 (no active moult).
