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WEIGHTS, BREEDING, AND SURVIVAL IN EUROPEAN SPARROWHAWKS I. NEWTON, M. MARQUISS, AND A. VILLAGE Institute of Terrestrial Ecology, Monks Wood Experimental Station, Abbots Ripton, Females that did not lay eggs remained low in weight throughout the early part of the breeding season and weighed as much as breeding males in the same month. n = 10; females: 147-1798, K = 163.6, SD = 10.0, II = 13, t = 9.49, P males and four females whose mates were killed or disappeared, two males obtained new mates within 24 hr. Two females had new mates within 1 month, and the remaining five adults did not acquire mates that breeding season. Nest sites and food.

Males initially compete fiercely for territories (nest sites in seaweed or mussel shells) during the short breeding season (May to July). But over the course of the breeding season, males become scarce, and females begin to behave aggressively toward one another and to court males. Do the data below explain this switch in aggression? How? Reconnaissance for future breeding sites by spotted sandpipers the year of transience for numbers of breeding males and females, numbers of eggs laid and hatched, and absolute sex ratio Cited by: 72.

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