Extra-pair paternity and the reproductive role of male floaters in the tree swallow (Tachycineta bicolor)

By B. Kempenaers, Susie Everding, C. Bishop, P. Boag, R. Robertson. Behavioral Ecology and Sociobiology, 2001

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Sperm quantity and quality effects on fertilization success in a highly promiscuous passerine, the tree swallow Tachycineta bicolor (2010, background): “Tree swallows are highly promiscuous, and extrapair paternity levels are generally high in this species, typically with more than 45% of the young being sired by extrapair males (e.g. Lifjeld et al. 1993; Kempenaers et al. 2001; Bitton et al. 2007; Stapleton et al. 2007; Delmore et al. 2008).”
Site attachment of floaters predicts success in territory acquisition (2004, background): “In tree swallows, Tachicineta bicolor (Barber and Robertson, 1999; Kempenaers et al., 2001), and stichbirds, Notiomystis cincta (Ewen et al.”
Effects of extra-pair and within-pair reproductive success on the opportunity for selection in birds (2005, methodology): “…0.31 5.2 41.5 56.6 1.9 M N Whittingham and Lifjeld, 1995 a Means of 1997 and 1998 data presented in Tables 3 and 4 of Webster et al. (2001). b Variance partitioned using data in Figure 1 of Kempenaers et al. (2001). c Variance partitioned using data in Figure 2 of Whittingham and Lifjeld (1995).”
Sexual selection on aggressiveness in females: evidence from an experimental test with tree swallows (2008, unknown): “Accordingly, at least 25% of tree swallows behave as nonterritorial floaters (Stutchbury & Robertson 1985; Kempenaers et al. 2001), which are reproductively mature individuals who do not breed because they do not have access to a nesting site (Brown 1969).”