Partnerwisseling bij een tweede broedsel van een Grauwe Vliegenvanger Muscicapa striata
Drentse vogels , Volume 7 - Issue 1 p. 39- 43
An old Bam Swallow nest was used for nesting by Spotted Flycatchers since at least 1992. In 1992-94, respectively 1, 1 and 2 nesting attempts were registered on this nest, all of them successful. Egg laying started on 20 May 1992 (5 eggs), 1 June 1993 (5 eggs), 16 May 1994 (1st brood, 5 eggs) and 1 July 1994 (2nd brood, 4 eggs, start 15 days after fledging of first brood). Both parents were colour-ringed in 1993. The colour-ringed male returned in 1994, and made use of exactly the same hunting posts as the year before. The female of the first nest in 199 did not carry a ring, and was therefore new. However, the colour-ringed 1993-female (paired with the 1993-male, father of the first brood in 1994) was responsible for the second laying in the same nest. Consequently, the second laying was, strictly speaking, only a 2nd laying for the male, not for the female (unless the male had been a bigamist). Onset of laying was earliest in 1994, a year in which May was relatively cold and rainy (Table 1). Arrival date may have some influence on onset of laying and occurrence of second layings, as may temperature (Fig. 1). Sample size is very small, however.
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