INTER- AND WITHIN-TROOP COMPETITION OF FEMALE RING-TAILED LEMURS: A PRELIMINARY REPORT

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概要

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• In a female-bonded/matrilineal group of primates, females may suffer fromcompetition in both within- and inter-troop contexts. The balance between these two formsof competition was analyzed from the behavioral and demographic data recorded for a wildpopulation of ring-tailed lemurs at Berenty Reserve, Madagascar. Within a troop, harsh andpersistent aggressive behavior (targeting behavior) among female members ultimately evictedsome victims. Troop size may infl uence the correlations between female rank and their reproductiveparameters. In large troops, lower ranked females tended to show lower reproductivesuccess than other females, but the differences were not significant. Birth rate and reproductivesuccess (number of surviving infants) exhibited a humped curve against troop size,corresponding to Wrangham's IGFC (inter-group feeding competition) hypothesis. A troopmay show the following cycle: First, a troop gains advantages via inter-troop competition,and increases in size. When optimal troop size is exceeded, the reproductive success of eachfemale may decrease due to serious within-troop competition. Then, dominant females mayevict subordinate females from the troop. The evicted females may form a new troop (troopfi ssion), and transfer into other troops (i.e., female transfer/fusion), or die (group extinction).

• 京都大学の論文

著者

• Yukio Takahata

  School Of Policy Studies Kwansei Gakuin University the Center For African Area Studies Kyoto

• Takahata Yukio

  School Of Policy Studies Kwansei Gakuin University

関連論文

• INTER- AND WITHIN-TROOP COMPETITION OF FEMALE RING-TAILED LEMURS: A PRELIMINARY REPORT
• The relationship between female rank and reproductive parameters of the ringtailed lemur : a preliminary analysis
• Body mass of wild ring-tailed lemurs in Berenty Reserve, Madagascar, with reference to tick infestation : a preliminary analysis
• Influence of group size on reproductive success of female ring-tailed lemurs : distinguishing between IGFC and PFC hypotheses
• Long-term changes in dominance ranks among ring-tailed lemurs at Berenty Reserve, Madagascar
• DO RINGTAILED LEMURS EXHIBIT A SKEWED BIRTH SEX RATIO DEPENDING ON SOCIAL AND ENVIRONMENTAL CONDITIONS? A PRELIMINARY ANALYSIS OF A WILD POPULATION
• Density of Japanese Macaque (Macaca fuscata yakui) Males Ranging Alone : Seasonal and Regional Variation in Male Cohesiveness with the Group

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