The effects of genetic relatedness on mate choice and territorial intrusions in a monogamous raptor

Genetic structure confirms female-biased natal dispersal in the White-tailed Eagle population of the Carpathian Basin

“…Female-biased dispersal is common in bird species, and may serve inbreeding avoidance, or may be a consequence of different sex roles derived from their resource defence system (Greenwood & Harvey 1982, Perrin & Mazalov 2000. Our findings suggest that sexbiased natal dispersal contribute to the generally low pairwise intersexual relatedness of WTEs breeding close to each other in Southwestern Hungary (Nemesházi et al 2018).…”

“…Feathers shed by intruders may also occur at occupied nest sites and misidentification of the intruders as breeders could significantly bias the results of investigations concentrat- ing on the breeding population. Nevertheless, our conservative criteria described above were assumed to be adequate for identification of resident WTEs based on non-invasive sampling (Nemesházi et al 2018). Individuals which did not meet the above criteria were excluded from the further analyses.…”

“…PCR profiles followed the original papers for Aa and Hal loci, and Hailer et al (2006) for IEAAAG loci, with some modifications (Nemesházi et al 2016 (Rousset 2008) was used to estimate pairwise linkage disequilibrium across loci. Consensus individual genotypes were prepared manually, based on genotypes of feathers collected at the same nest site (as described in Nemesházi et al 2018). Probability of identity for combinations of increasing number of loci was calculated with GenAlEx 6.5 (Peakall & Smouse 2012).…”

“…Therefore, instead of conventional methods, genetic data recovered from non-invasive samples are increasingly used to investigate several topics of individual-based studies, such as annual turnover rate of breeding individuals, parentage, breeding dispersal, or territorial intrusions (Rudnick et al 2005, Booms et al 2011, Vili et al 2013b, Nemesházi et al 2018. Straightforward methods for investigation of natal dispersal require knowledge on both the hatching and first breeding place of the sampled individuals.…”

Driving forces behind the fluctuating growth of the number of successful nests in an inland population of white‐tailed eagles in Hokkaido, Japan

“…Juveniles leave their parental territory 92 days after fledging and make various excursions from their natal site (Engler & Krone, 2022). Nemesházi et al (2018) reported territory intrusions in seven of 11 territories, and those intrusions were done mainly by juveniles, which were not offspring of resident pairs. Because of the difficulty of identifying nonterritory holders, most studies have analyzed the number of breeding pairs or territories as a proxy of population size (e.g., Evans et al, 2009; Herrmann et al, 2009; Heuck et al, 2017; Krüger et al, 2010; Stjernberg et al, 2007; Sulawa et al, 2010).…”