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Acute pulmonary embolism: assessment of helical CT for diagnosis
Authors:EA Drucker  SM Rivitz  JA Shepard  PM Boiselle  B Trotman-Dickenson  TJ Welch  TP Maus  SW Miller  JA Kaufman  AC Waltman  TC McLoud  CA Athanasoulis
Affiliation:Department of Animal and Plant Sciences, University of Sheffield
Abstract:Male pigeons, Columba livia, employ intense mate guarding and frequent copulation apparently as strategies to ensure their paternity. The aim of this study was to investigate the benefits to females of mate guarding by males and frequent copulation. Field observations showed that females initiated the majority of copulations and females that solicited copulations more frequently were guarded more closely by their partner. Experimental removal of guarding male partners showed that: (1) unguarded, fertile females suffered increased harassment from extrapair males which reduced their foraging efficiency; and (2) unguarded, fertile females did not seek copulations with extrapair males. Various explanations for frequent pair copulation initiated by females are discussed and we conclude that female pigeons trade pair copulations for protection (mate guarding) against sexual harassment from other males. Copyright 1998 The Association for the Study of Animal Behaviour.
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