Trade-offs of predation and foraging explain sexual segregation in African buffalo

Show simple item record Hay, C.T. Cross, Paul C. Funston, Paul J. 2009-02-27T06:01:49Z 2009-02-27T06:01:49Z 2008
dc.description.abstract Many studies have investigated why males and females segregate spatially in sexually dimorphic species. These studies have focused primarily on temperate zone ungulates in areas lacking intact predator communities, and few have directly assessed predation rates in different social environments. Data on the movement, social affiliation, mortality and foraging of radio-collared African buffalo (Syncerus caffer) were collected from 2001–06 in the Kruger National Park, South Africa. The vast majority of mortality events were due to lion (Panthera leo) predation, and the mortality hazard associated with being an adult male buffalo in a male-only 'bachelor' group was almost four times higher than for adult females in mixed herds. The mortality rates of adult males and females within mixed herds were not statistically different. Mortality sites of male and female buffalo were in areas of low visibility similar to those used by bachelor groups, while mixed herds tended to use more open habitats. Males in bachelor groups ate similar or higher quality food (as indexed by percentage faecal nitrogen), and moved almost a third less distance per day compared with mixed herds. As a result, males in bachelor groups gained more body condition than did males in breeding herds. Recent comparative analyses suggest the activity-budget hypothesis as a common underlying cause of social segregation. However, our intensive study, in an area with an intact predator community showed that male and female buffalo segregated by habitat and supported the predation-risk hypothesis. Male African buffalo appear to trade increased predation risk for additional energy gains in bachelor groups, which presumably leads to increased reproductive success. en_US
dc.identifier.citation Hay, CT, Cross, PC & Funston, PJ 2008, ‘Trade-offs of predation and foraging explain sexual segregation in African buffalo’, Journal of Animal Ecology, vol. 77, no. 5, pp. 850-858. [http://] en_US
dc.identifier.issn 0021-8790
dc.identifier.other 10.1111/j.1365-2656.2008.01409.x
dc.language.iso en en_US
dc.publisher Blackwell en_US
dc.rights Blackwell. The definitive version is available at This article is embargoed by the publisher until September 2009. en_US
dc.subject Group affiliation en_US
dc.subject Habitat risk en_US
dc.subject Mortality rate en_US
dc.subject Syncerus caffer en_US
dc.subject.lcsh African buffalo -- Ecology -- South Africa en
dc.title Trade-offs of predation and foraging explain sexual segregation in African buffalo en_US
dc.type Postprint Article en_US

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