| Co-Investigator(Kenkyū-buntansha) |
CESAR Barbos コロンビア国環境庁, 自然保護局, 研究員
CARLOS Mejia ロスアンデス大学, 理学部, 教授
HIRABUKI Yoshihiko Miyagi University of Education, 教育学部, 助手 (50143045)
YONEDA Masaaki Japan Wildlife Research Center, 研究員
NISHIMURA Akisato Doshisha University, 工学部, 教授 (00027492)
MEJIA Carlos Los Andes University (Colombia)
BARBOSA Cesar INDERENA (Colombia)
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| Budget Amount *help |
¥12,000,000 (Direct Cost: ¥12,000,000)
Fiscal Year 1989: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥10,000,000 (Direct Cost: ¥10,000,000)
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| Research Abstract |
Following results were obtained from the ecological and sociological studies of seven species of New World monkeys living in La Macarena region, Colombia. 1. As for the social structure, capuchins (Cebus apella) live in a multimale and multifemale group and member transfer occurs primarily for males. Rank order among males depends on the age and that of females depends on the affinitive relations towards males. 2. Howler monkeys (Alouatta seniculus) live in a one-male group and member transfer occurs only for males. Infanticide occurs when alpha-male of the group changes. 3. Woolly monkeys (Lagothrix lagotricha) live in a multimale and multifemale group and member transfer occurs primarily for females, especially young nuliparous ones. Copulation has no seasonality and the mounting is of single type lasting for 2-24 minutes (av. 8 min.) 4. The difference of habitat utilization of five species of cebid monkeys was confirmed. That is, capuchins and squirrel monkeys (Saimiri sciureus) occupy the lower strata of forest in lower parts of slope to lowlands, whereas howler monkeys, woolly monkeys and spider monkeys (Ateles belzebuth) use mainly the upper strata of forest and upper parts of slope to rising highlands. 5. Physiognomy of vegetation and landforms were measured along two trails in the study area, most of which consisted of undulating hilly land. Five vegetation types were distinguished, and the existence of each type was closely related to particular disturbances in each of the landforms; i.e., channel changes of meandering river, floods, erosions, landslides and tree-falls. 6. Red howler monkeys eat particular soils selectively. Soils eaten by monkeys had higher pH(H_2O) values (4.45.4) and higher concentration of some minerals, namely, N, P, Ca, K, Na and Cl, than forest floor soils not eaten.
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