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To empirically determine the effects of sample size on commonly used measures of average genetic diversity, we genotyped 200 song… Expand SummaryPrevious investigations have shown that malemale interactions over territory boundaries result in an increase in plasma… Expand Gonadotropin‐releasing hormone (GnRH) regulates reproduction in all vertebrates. Until recently, an antagonistic neuropeptide for… Expand Inbreeding depression is thought to be a major factor affecting the evolution of mating systems and dispersal. While there is… Expand Male song sparrows (Melospiza melodia morphna) of western Washington State show year-round territoriality. Although territorial… Expand A group of 10 territorial male song sparrows, Melospiza melodia, were given subcutaneous implants of corticosterone in Silastic… Expand Naive 50-day-old white-crowned sparrows (Zonotrichia leucophrys nuttalli) were placed in cages with two compartments in which… Expand Reliable signals of social status are a seeming paradox. High social status often confers survival or reproductive advantages… Expand Abstract Vocalizations and social organization of a semi-flightless passerine ( Philesturnus carunculatus ) were studied in a… Expand Harris sparrows (Zonotrichia querula) signal their social dominance by variations in the extent of black feathering on their… Expand