Microclimate and Moving Pattern
Takemoto (2004) demonstrated that although seasonal changes in the rate of ground usage were affected to some extent by the vertical or horizontal distribution of food, the main effect seemed to be microclimatic fluctuations in the forest (Fig. 33.1). In tropical forest, various vertical structures can be observed not only in biomass production but also in temperature and relative humidity (RH) (Richards 1996). In such kind of habitat, chimpanzees are expected to use higher places in cold conditions such as during the wet season to reduce their costs of thermoregulation, because higher places exhibit higher temperatures compared with the forest floor. Similarly, chimpanzees will use areas nearer the ground more often to prevent increasing their metabolism when ambient temperatures are extremely high.
KeywordsTropical Forest Vertical Structure Primary Forest Tree Crown Vertical Difference
I thank the Ministère de l’Enseignement Supérieur et de la Recherche Scientifique et Technologique, in particular the Direction Nationale de la Recherche Scientifique et Technologique (DNRST) and the Institut de Recherche Environnementale de Bossou (IREB), for granting me the permission to carry out research at Bossou. This work was supported by KAKENHI (19657074).
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