Social boundaries in a Malagasy Prosimian, the Sifaka (Propithecus verreauxi)

  title={Social boundaries in a Malagasy Prosimian, the Sifaka (Propithecus verreauxi)},
  author={Alison F. Richard},
  journal={International Journal of Primatology},
  • A. Richard
  • Published 1 December 1985
  • Environmental Science
  • International Journal of Primatology
Using focal animal samples, the social organization of sifakas was studied in two forests for 2500 hr spread over 18 months. Data were also obtained on the size and composition of groups at two other sites. The size and adult sex ratio of groups varied widely within populations, although population-wide sex ratios approached unity. During the brief annual mating season, some males mated with females belonging to other groups. The response of both male and female group members to the approach of… 

Social Influences on Group Membership in Propithecus verreauxi verreauxi

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Patterns of male dispersal in Verreaux's sifaka (Propithecus verreauxi) at Kirindy Mitea National Park

The absence of a seasonal immigration pattern suggests that fluid group boundaries may allow mating success without establishment in a social group before the mating season, and it is suggested that coalitions may be used to improve competitive ability.

Intergroup encounters in Verreaux’s sifakas (Propithecus verreauxi): who fights and why?

Investigating the influence of different incentives on individual participation in intergroup encounters in wild Malagasy primate, Verreaux’s sifakas proposes a novel approach that takes into account the variable circumstances of each conflict, such as the number of individuals fighting in both groups as a predictor for participation.

Male reproductive skew in multimale social groups of Verreaux’s Sifaka (Propithecus verreauxi) at Kirindy Mitea National Park, Madagascar

Female reproductive strategies might hinder dominant males’ monopolization of matings and provide reproductive opportunities to non-dominant and extra-group males in a population of Verreaux’s sifaka living in Kirindy Mitea National Park, Madagascar.

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Sexual selection theory predicts that in group-living mammals, male reproductive tactics can lead to high reproductive skew in favor of dominant individuals. In sifakas (Propithecus verreauxi), a

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Bimorphism in Male Verreaux’s Sifaka in the Kirindy Forest of Madagascar

It is suggested that stained chests are visual and olfactory signals of dominance rank and that clean chests signal lack of competitive intent.

Even adult sex ratios in lemurs: Potential costs and benefits of subordinate males in Verreaux's sifaka (Propithecus verreauxi) in the Kirindy Forest CFPF, Madagascar.

Verreaux's sifakas (Propithecus verreauxi) form multimale multifemale groups with the tendency toward even adult sex ratios despite a small average number of females per group, but aggression rates between dominant and immigrated subordinate males increase in the mating season.

Landscape genetics of an endangered lemur (Propithecus tattersalli) within its entire fragmented range

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This small reserve at Berenty should be carefully monitored as its lemurs have so far maintained relative population stability, but both males and females can change troop outside the breeding season.

Intergroup social dynamics of the Cayo Santiago rhesus (Macaca mulatta) with special reference to changes in group membership by males

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Dominance and reproduction in Baboons (Papio cynocephalus).

This monograph reports on a 14 month study of yellow baboons in the Masai-Amboseli Game Reserve, Kenya, an attempt to determine the relationship between agonistic dominance and reproductive success in male baboons and centered around testing a priority-of-access model of mating behavior.

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  • Psychology
    International Journal of Primatology
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It is suggested that environmental pressures resulting in social crowding can be critical in determing the occurrence of takeovers in some populations of Presbytis entellus.

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While males seem to benefit by transferring nonrandomly with their peers when young, it may be more advantageous for older males to disperse alone, and age-related changes in the social benefits of nonrandom transfer appear to have important genetic consequences for the population as a whole.

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  • Psychology, Biology
    Animal Behaviour
  • 1979

Monogamy in Mammals

  • D. Kleiman
  • Biology
    The Quarterly Review of Biology
  • 1977
This review considers the behavioral, ecological, and reproductive characteristics of mammals exhibiting monogamy, i.e., mating exclusivity. From a discussion of the life histories of selected

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An 18-month study of the social organization and ecology of Propithecus verreauxi was carried out in Madagascar between May 1970 and September 1971. Two groups were studied in the mixed deciduous and

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  • G. Hausfater
  • Psychology
    Folia primatologica; international journal of primatology
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Female Promiscuity and Male Reproductive Success in Social Birds and Mammals

The model suggests that when promiscuity is advantageous to the female, a male should not interfere with copulations by other males when male-male cooperation is important to the survival of the young, and when subordinate males are likely to leave the group if prevented from breeding.