MICROSATELLITE TYPING REVEALS MATING PATTERNS IN THE BROOD PARASITIC GREAT SPOTTED CUCKOO (CLAMATOR GLANDARIUS)

Despite the interest that avian brood parasites provoke due to their r eproductive strategy, and the wealth of published studies, their matin g system is one of the least known aspects of their natural history. T his study describes the first attempt to use genetics to characterize mating patterns in a brood parasite, the great spotted cuckoo (Clamato r glandarius). We developed a set of microsatellite markers for this s pecies that allowed us to determine the parentage of 78% of the chicks sampled, with a high probability of certainty (false parental inclusi on probability, P-FI = 2 x 10(-4)). Parentage analyses allowed us to d etermine mating patterns in the population, to show for the first time that there were several females laying in the same study site and sha ring host nests, and that females used nests of two different host spe cies in the same season. A total of 70% of the inferred mating relatio nships can be considered monogamous, and the rest were cases of geneti c polygamy although of unknown social structure. To ease parentage ana lyses, adult birds were successfully sexed using a combination of sex- specific PCR primers and SSCP techniques before parentage assignment.