Social behavior of breeding canvasbacks (Aythya valisineria) : male and female strategies of reproduction / Michael George Anderson.
Material type:
TextSeries: Thesis ; (Ph.D.)Publication details: MN : University of Minnesota, 1985.Description: viii, 281 p. : ill. ; 28 cmOnline resources: Abstract: I studied breeding canvasbacks in southwestern Manitoba from 1975 -1979. This thesis consists of 3 parts. Part I : Hypothetical patterns of male and female cumulative reproductive effort were used to predict the relative efforts of mates in affiliative behavior through a breeding sequence. The sex whose cumulative effort was less tended to be more active in maintaining proximity to its mate, initiating bouts of mutual display, and coordinating pair activities. Factors other than simple parental -investment-related desertion costs appear to be important to an individuals decisions regarding pair-bond reinforcement and mate abandonment. Males and females used various pair-reinforcement tactics differently. Part 2 : Unlike males, females returned to the study area each year and used largely the same wetlands. This may be the result of selection for early pairing, advantages of experience that accrue to homing females, and the consequent inability of males to both monopolize a mate and b
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Includes bibliographical references (p. 46-52, 192-207, 232-239, 250-252).
I studied breeding canvasbacks in southwestern Manitoba from 1975 -1979. This thesis consists of 3 parts. Part I : Hypothetical patterns of male and female cumulative reproductive effort were used to predict the relative efforts of mates in affiliative behavior through a breeding sequence. The sex whose cumulative effort was less tended to be more active in maintaining proximity to its mate, initiating bouts of mutual display, and coordinating pair activities. Factors other than simple parental -investment-related desertion costs appear to be important to an individuals decisions regarding pair-bond reinforcement and mate abandonment. Males and females used various pair-reinforcement tactics differently. Part 2 : Unlike males, females returned to the study area each year and used largely the same wetlands. This may be the result of selection for early pairing, advantages of experience that accrue to homing females, and the consequent inability of males to both monopolize a mate and b