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Yukiko Shimooka, Laboratory of Human Evolution, Department of Zoology, Kyoto University, Kyoto 606-8502, Japan,
Christina J. Campbell, Department of Anthropology, California State University Northridge, Northridge, CA 91330, USA,
Anthony Di Fiore, Center for the Study of Human Origins, Department of Anthropology, New York University, New York, NY 10003, USA,
Annika M. Felton, Australian National University, Canberra ACT 0200, Australia,
Kosei Izawa, Department of Animal Sciences, Teikyo University of Science and Technology, Yamanashi, 409–0193, Japan,
Andres Link, Center for the Study of Human Origins, Department of Anthropology, New York University, New York, NY 10003, USA,
Akisato Nishimura, Biological Laboratory, Science and Engineering Research Institute, Doshisha University, Kyoto, 602-8580, Japan,
Gabriel Ramos-Fernández, Instituto Politécnico Nacional, Santa Cruz Xoxocotlán, Oaxaca 71230, México,
Robert B. Wallace, Wildlife Conservation Society – Bolivia, San Miguel, La Paz, Bolivia
Spider monkeys are distributed widely throughout Central and South America and studies have been conducted at a variety of sites across the geographic range of the genus (see Table 1.1 in Campbell, this volume). However, detailed information about group composition and demography of spider monkeys remains largely unavailable. Because their fission–fusion social organization allows researchers to observe only a part of a group at any time, short-term surveys can rarely document overall group size and composition. Only a cumulative data set of party composition based on individual identification and longitudinal research can help determine the full composition of a group. Furthermore, the rarity of births and deaths make other demographic variables such as interbirth intervals only available through long-term investigation. In the 1980s, relevant demographic information from wild populations was available only for seven groups from five sites for three Ateles species. In this chapter, we present an updated summary of existing data on four Ateles species from 18 groups and 13 sites. We analyze both previously published and new data from these sites and compare them in order to re-examine the demographic characteristics of spider monkey groups.
Demographic data from 18 groups and 13 sites (Table 12.1) were gathered from the literature and augmented with data from a questionnaire sent to spider monkey researchers in 2005.
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