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• W2326408401 abstract "Female-female aggression among polygynously breeding Red-winged Blackbirds (Agelaius phoeniceus) has been reported by many researchers (e.g. Nero 1956, Roberts and Searcy 1988), but there is little agreement as to its function. A female Red-winged Blackbird might behave aggressively towards other females to deter or delay the settlement of potential competitors (Hurly and Robertson 1985, but see Searcy 1988), or to defend nest sites or subterritories from other females sharing her mate's territory (Hurly and Robertson 1984, but see Searcy 1986). These putative functions of female-female aggression are not mutually exclusive, and aggression could also serve additional functions, such as protection against intraspecific brood parasitism. Our study documents temporal variation in femalefemale aggression in a population of Red-winged Blackbirds to determine whether aggressive behavior was associated more closely with female settlement or with initiation of nesting. If aggressive behavior by established females coincides with the peak of arrivals of unmated competitors, then it may serve to deter prospecting females from attempting to pair with males. However, if aggression occurs primarily during the initiation of clutches it may function in the defense of nest sites or nest-related resources. Also, since exogenous testosterone has been shown to increase aggressive displays in free-living female Red-winged Blackbirds (Searcy 1988), we examined the seasonal profile of plasma testosterone concentration (hereafter referred to as testosterone) and looked for correlations between temporal peaks in testosterone and timing of female aggression and arrival. Although other functions cannot be ruled out in a correlative study such as ours, describing the timing and endocrine basis of female-female aggression is a necessary step towards understanding the role of this behavior in a polygynous mating system. Methods.-The study site was a cattail (Typha sp.) marsh at the north end of Yellowwood Lake, a 54-ha lake in Yellowwood State Forest, Brown Co., Indiana. Red-winged Blackbirds have been studied and color" @default.
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• W2326408401 date "1994-01-01" @default.
• W2326408401 modified "2023-09-26" @default.
• W2326408401 title "Spring Arrival, Aggression and Testosterone in Female Red-Winged Blackbirds (Agelaius phoeniceus)" @default.
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• W2326408401 doi "https://doi.org/10.2307/4088527" @default.
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