Altmann S (1974) Baboons, space, time, and energy. Am Zool 14: 221–248

Google Scholar 

Bradbury JW, Vehrencamp SL (1977) Social organization and foraging in emballonurid bats. 11. A model for the determination of group size. Behav Ecol Sociobiol 1: 383–404

Google Scholar 

Butynski TM (1990) Comparative ecology of blue monkeys (Cercopithecus mitis) in high- and low-density subpopulations. Ecol Monogr 60: 1–26

Google Scholar 

Chapman CA (1987) Flexibility in diets of three species of Costa Rican primates. Folia Primatol 49: 90–105

Google Scholar 

Chapman CA (1988) Patch use and patch depletion by the spider and howling monkeys of Santa Rosa National Park, Costa Rica. Behaviour 105: 99–116

Google Scholar 

Chapman CA (1990a) Association patterns of spider monkeys: The influence of ecology and sex on social organization. Behav Ecol Sociobiol 26: 409–414

Google Scholar 

Chapman CA (1990b) Ecological constraints on group size in three species of neotropical primates. Folia Primatol 55: 1–9

Google Scholar 

Chapman CA, Chapman LJ (1990) Density and growth rate of some tropical dry forest trees: Comparisons between successional forest types. Bull Torrey Bot Club 117: 226–231

Google Scholar 

Chapman CA, Lefebvre L (1990) Manipulating foraging group size: Spider monkey food calls at fruiting trees. Anim Behav 39: 891–896

Google Scholar 

Chapman CA, Wrangham RW (1993) Range use of the forest chimpanzees of Kibale: Implications for the evolution of chimpanzee social organization. Am J Primatol 31: 263–273

Google Scholar 

Chapman CA, Chapman LJ, McLaughlin RL (1989) Multiple central place foraging by spider monkeys: travel consequences of using many sleeping sites. Oecologia 79: 506–511

Google Scholar 

Chapman CA, Chapman LJ, Wrangham RW, Hunt K, Gebo D, Gardner L (1992) Estimators of fruit abundance of tropical trees. Biotropica 24: 527–531

Google Scholar 

Chapman CA, White FJ, Wrangham RW (1993) Defining subgroup size in fission-fusion societies. Folia Primatol 61: 31–34

Google Scholar 

Charnov EL (1976) Optimal foraging: the marginal value theorem. Theor Popul Biol 9: 129–136

Google Scholar 

Clark A, Wrangham R (1993) Acoustic analysis of wild chimpanzee pant hoots: do Kibale forest chimpanzees have an acoustically distinct food arrival pant hoot? Am J Primatol 31: 99–109

Google Scholar 

Clutton-Brock TH, Harvey PH (1977). Primate ecology and social organization. J Zool 183: 1–39

Google Scholar 

Dittus W (1979) The evolution of behaviour regulating density and age-specific sex ratios in a primate population. Behaviour 69: 265–302

Google Scholar 

Eisenberg JF (1973) Reproduction in two species of spider monkeys Ateles fusciceps and Ateles geoffroyi. J Mammal 54: 955–957

Google Scholar 

Fedigan LM, Baxter MJ (1984) Sex differences and social organization in free-ranging spider monkeys (Ateles geoffroyi). Primates 25: 279–294

Google Scholar 

Ghiglieri MP (1984) The chimpanzee of Kibale Forest. Columbia University Press, New York

Google Scholar 

Goodall J (1986) The chimpanzees of Gombe. Harvard University Press, Cambridge

Google Scholar 

Hauser MD (1990) Do chimpanzee copulatory calls incite malemale competition? Anim Behav 39: 596–597

Google Scholar 

Janson CH, Schaik CP van (1988) Recognizing the many faces of primate food competition: Methods. Behaviour 105: 165–186

Google Scholar 

Klein LL (1971) Observations on copulation and seasonal reproduction of two species of spider monkeys, Ateles belzebuth and A. geoffroyi. Folia Primatol 15: 233–248

Google Scholar 

Klein LL (1972) The ecology and social organization of spider monkeys Ateles belzebuth. Ph.D. Dissertation, University of California, Berkeley

Google Scholar 

Klein LL (1974) Agonistic behaviour in neotropical primates. In: Holloway L (ed) Primate aggression, territoriality, and xenophobia. Academic Press, New York, pp 77–122

Google Scholar 

Klein LL, Klein DB (1977) Feeding behaviour of the Columbian spider monkey, Ateles belzebuth. In: Clutton-Brock TH (ed) Primate ecology. Academic Press, London, pp 153–181

Google Scholar 

Leighton M, Leighton DR (1982) The relationship of size and feeding aggregate to size of food patch: Howler monkeys (Alouatta palliata) feeding in Trichilia cipo fruit trees on Barro Colorado Island. Biotropica 14: 81–90

Google Scholar 

MacDonald DW (1979) The flexible social system of the golden jackal, Canis aureus. Behav Ecol Sociobiol 5: 17–38

Google Scholar 

Milton K (1981) Food choice and digestive strategies of two sympatric primate species. Am Nat 117: 496–505

Google Scholar 

Milton K (1984) Habitat, diet, and activity patterns of free-ranging wooly spider monkeys (Brachyteles arachnoides E. Geoffroyi 1806). Int J Primatol 5: 491–514

Google Scholar 

Peters R, Cloutier S, Dube D, Evans A, Hastings P, Kohn D, Sawer-Foner B (1988) The ecology of the weight of fruit on trees and shrubs in Barbados. Oecologia 74: 612–616

Google Scholar 

Robbins D, Chapman CA, Wrangham RW (1991) Group size and stability: Why do gibbons and spider monkeys differ? Primates 32: 301–305

Google Scholar 

Rondinelli R, Klein LL (1976) An analysis of adult social spacing tendencies and related social interactions in a colony of spider monkeys (Ateles geoffroyi) at the San Francisco Zoo. Folia Primatol 25: 122–142

Google Scholar 

Skorupa J (1988) The effect of selective timber harvesting on rainforest primates in Kibale Forest, Uganda. Ph.D. Dissertation, University of California, Davis

Google Scholar 

Sokal R, Rohlf F (1981) Biometry. Freeman, San Francisco

Google Scholar 

Stephens DW, Krebs JR (1986) Foraging theory. Princeton University Press, Princeton

Google Scholar 

Strier KB (1989) Effects of patch size on feeding associations in muriquis (Brachyteles arachnoides). Folia Primatol 52: 70–77

PubMed  Google Scholar 

Struhsaker TT (1980) Comparison of the behaviour and ecology of red colobus and redtail monkeys in the Kibale Forest, Uganda. Afr J Ecol 18: 33–51

Google Scholar 

Struhsaker TT, Leland L (1979) Socioecology of five sympatric monkey species in the Kibale Forest, Uganda. Adv Study Behav 9: 159–227

Google Scholar 

Symington M (1988) Demography, ranging patterns, and activity budgets of black spider monkeys (Ateles paniscus chamek) in the Manu National Park, Peru. Am J Primatol 15: 45–67

Google Scholar 

Symington M (1990) Fission-fusion social organization in Ateles and Pan. Int J Primatol 11: 47–61

Google Scholar 

Terborgh J (1983) Five new world primates. Princeton University Press, Princeton

Google Scholar 

Terborgh J, Janson CH (1986) The socioecology of primate groups. Annu Rev Ecol Syst 17: 111–135

Google Scholar 

Tutin CEG (1979) Mating patterns and reproductive strategies in a community of wild chimpanzees (Pan troglodytes schweinfurthii). Behav Ecol Sociobiol 6: 29–38

Google Scholar 

White FJ, Wrangham RW (1988) Feeding competition and patch size in the chimpanzee species Pan paniscus and Pan troglodytes. Behaviour 105: 148–164

Google Scholar 

Whitten PL (1983) Diet and dominance among female vervet monkeys (Cercopithecus aethiops). Am J Primatol 5: 139–159

Google Scholar 

Wrangham RW (1977) Feeding behaviour of chimpanzees in Gombe National Park, Tanzania. In: Clutton-Brock TH (ed) Primate ecology. Academic Press, London, pp 504–538

Google Scholar 

Wrangham RW, Smuts BB (1980) Sex differences in the behavioural ecology of chimpanzees in the Gombe National Park, Tanzania. J Reprod Fert 28: 13–31

Google Scholar 

Wrangham RW, Conklin NL, Chapman CA, Hunt KD (1991) The significance of fibrous foods for Kibale Forest chimpanzees. Phil Trans R Soc London 334: 171–178

Google Scholar 

Wrangham RW, Clark AP, Isabirye-Basuta G (1992) Female social relationships and social organization of Kibale Forest Chimpanzees. In: Nishida T, McGrew WC, Marler P, Pickford M, Waal F de (eds) Human origins. Tokyo University Press, Tokyo, pp 81–98

Google Scholar 

Wrangham RW Gittleman JL, Chapman CA (1993) Constraints on group size in primates and carnivores: population density and day-range as assays of exploitation competition. Behav Ecol Sociobiol 32: 199–210

Google Scholar 

Wrangham RW, Chapman CA, Chapman LJ (1994) Seed dispersal by forest chimpanzees. J Trop Ecol 10: 355–368

Google Scholar