Establishing dietary central tendencies and extremes remains an important goal of primate research. While habitat differences and spatial discontinuity are well-documented contributors to dietary variation, other factors including polyspecific associations may significantly impact diet through changes in strata use and/or increased feeding competition. Here, we examine polyspecific association with closely related species as a source of dietary variation in a rain forest primate. Diana monkeys (Cercopithecus diana) in Côte d'Ivoire's Taï Forest frequently participate in mixed-species groups. We use data collected over a 5-year period on 4 Diana monkey groups to examine how association affects group diets. Groups exhibited significant differences in association rates with other guenon species, but this minimally influenced diet when food categories (fruit, invertebrates, leaves) were compared: diet overlap of 4 groups across the study period ranges from 90.8 to 98.1%. Examination of species composition within food categories is more revealing: intergroup dietary overlap decreases to 69.8-79.4% across the study period when comparing species contributing to total frugivory and folivory. These data support earlier findings that Diana monkeys maintain fruit-rich diets by competitively excluding sympatric congeners while highlighting that even selective frugivores such as Diana monkeys may exhibit remarkable dietary flexibility. Our study underscores the fact that broad categorical labels can obscure significant dietary differences.

1.
Altmann JA (1974). Observational study of behavior: sampling methods. Behaviour 49: 227-267.
2.
Anderson DP (2001). Tree Phenology and Distribution, and Their Relation to Chimpanzee Social Ecology in the Taï National Park, Côte D'Ivoire. PhD thesis, University of Wisconsin, Madison.
3.
Anderson DP, Nordheim EV, Moermond TC, Gone Bi ZB, Boesch C (2005). Factors influencing tree phenology in Taï National Park, Côte d'Ivoire. Biotropica 37: 631-640.
4.
Beeson M, Tame S, Keeming E, Lea SEG (1996). Food habits of guenons (Cercopithecus spp.) in Afro-montane forest. African Journal of Ecology 34: 202-210.
5.
Bitty EA, Gonedelé Bi S, Bene Koffi JC, Kouassi PK, McGraw WS (2015). Cocoa farming and primate extirpation inside Cote d'Ivoire's protected areas. Tropical Conservation Science 8: 95-113.
6.
Boesch C, Boesch-Achermann H (2000). The Chimpanzees of the Tai Forest. Oxford, Oxford University Press.
7.
Bryer MAH, Chapman CA, Rothman JM (2013). Diet and polyspecific associations affect spatial patterns among redtail monkeys (Cercopithecus ascanius). Behaviour 150: 277-293.
8.
Bshary R, Noe R (1997). Red colobus and Diana monkeys provide mutual protection against predators. Animal Behavior 54: 1561-1574.
9.
Butynski TM (1990). Comparative ecology of blue monkeys (Cercopithecus mitis) in high- and low-density subpopulations. Ecological Monographs 60: 1-26.
10.
Buzzard PJ (2004). Interspecific Competition among Cercopithecus campbelli, C. petaurista, and C. diana at Taï Forest, Côte d'Ivoire. PhD thesis, Columbia University, New York.
11.
Buzzard PJ (2006). Ecological partitioning of Cercopithecus campbelli, C. petaurista, and C. diana in the Taï Forest. International Journal of Primatology 27: 529-558.
12.
Buzzard PJ (2010). Polyspecific associations of Cercopithecus campbelli and C. petaurista with C. diana: what are the costs and benefits? Primates 51: 307-314.
13.
Buzzard PJ, Eckardt W (2007). Social systems of the Taï guenons (Cercopithecus spp.). In Monkeys of the Taï Forest: An African Primate Community (Zuberbühler K, McGraw S, Noë R, eds). Cambridge, Cambridge University Press, pp 51-71.
14.
Chapman CA, Chapman LJ (1990). Dietary variability in primate populations. Primates 31: 121-128.
15.
Chapman CA, Fedigan LM (1990). Dietary differences between neighboring Cebus capucinus groups: local traditions, food availability, or responses to food profitability? Folia Primatologica 54: 177-186.
16.
Chapman CA, Chapman LJ, Cords M, Mwangi Gathua J, Gautier-Hion A, Lambert JE, Rode K, Tutin CEG, White LJT (2002). Variation in the diets of Cercopithecus species: differences within forests, among forests, and between species. In The Guenons: Diversity and Adaptation in African Monkeys (Glenn ME, Cords M, eds.), pp 325-350. Chicago, University of Chicago Press.
17.
Clutton-Brock TH (1977). Some aspects of intraspecific variation in feeding and ranging behavior in primates. In Primate Ecology: Studies of Feeding and Ranging Behavior in Lemurs, Monkeys and Apes (Clutton-Brock TH, ed.), pp 539-556. New York, Academic Press.
18.
Cody ML (1971). Finch flocks in the Mohave Desert. Theoretical Population Biology 2: 142-158.
19.
Cords M (1986). Interspecific and intraspecific variation in the diet of two forest guenons, Cercopithecus ascanius and C. mitis. Journal of Animal Ecology 55: 811-827.
20.
Cords M (1987). Mixed-species association of Cercopithecus monkeys in the Kakamega Forest, Kenya. University of California Publications in Zoology 117: 1-109.
21.
Covey R, McGraw WS (2014). Monkeys in a West African bushmeat market: implications for cercopithecid conservation in eastern Liberia. Tropical Conservation Science 7: 115-125.
22.
Curtin SH (2002). Diet of the Roloway monkey (Cercopithecus diana roloway) in Bia National Park, Ghana. In The Guenons: Diversity and Adaptation in African Monkeys (Glenn ME, Cords M, eds.), pp 351-371. Chicago, University of Chicago Press.
23.
Danquah E, Tetteh EH (2016). Logging activity adversely impacts primate diversity and density in the Kwabre Rainforest of Ghana. International Journal of Ecology DOI: 7497326.
24.
DaSilva GL (1994). Diet of Colobus polykomos on Tiwai Island: selection of food in relation to its seasonal abundance and nutritional quality. International Journal of Primatology 15: 655-680.
25.
Eckardt W, Zuberbühler K (2004). Cooperations and competition in two forest monkeys. Behavioral Ecology 15: 400-411.
26.
Galat G, Galat-Luong A (1985). La communauté de primates diurnes de la forêt de Taï, Côte d'Ivoire. Terre Vie 40: 3-32.
27.
Gathua JM (2000). Intraspecific Variation in Foraging Patterns of Redtail Monkeys (Cercopithecus ascanius) in the Kakamega Forest, Kenya. PhD thesis, Columbia University, New York.
28.
Gautier-Hion A (1988a). The diet and dietary habits of forest guenons. In A Primate Radiation: Evolutionary Biology of the African Guenons (Gautier-Hion A, Bourlière F, Gautier JP, eds.), pp 257-283. New York, Cambridge University Press.
29.
Gautier-Hion A (1988b). Polyspecific associations among forest guenons: ecological, behavioural and evolutionary aspects. In A Primate Radiation: Evolutionary Biology of the African Guenons (Gautier-Hion A, Bourlière F, Gautier JP, eds.), pp 452-476. New York, Cambridge University Press.
30.
Gautier-Hion A, Quris R, Gautier KP (1983). Monospecific vs polyspecific life: a comparative study of foraging and antipredatory tactics in a community of Cercopithecus monkeys. Behavioral Ecology and Sociobiology 12: 325-335.
31.
Gonedelé Bi S, Koné I, Bitty EA, Béné Koffi JC, Akpatou B, Zinner D (2012). Distribution and conservation status of catarrhine primates in Côte d'Ivoire (West Africa). Folia Primatologica 83: 11-23.
32.
Harris TR, Chapman CA (2007). Variation in diet and ranging of black and white colobus monkeys in Kibale National Park, Uganda. Primates 48: 208-221.
33.
Hill C (1991). A study of territoriality in Cercopithecus diana: do females take an active part in territorial defense? PhD thesis, University College London, London.
34.
Hill CM (1994). The role of female Diana monkeys, Cercopithecus diana, in territorial defence. Animal Behaviour 47: 425-431.
35.
Hirata S, Watanabe S, Kawai M (2001). Sweet-potato washing revisited. In Primate Origins of Human Behavior and Cognition (Matsuzawa T, ed.). pp 487-508. Tokyo, Springer.
36.
Holmes RT, Pitelka FA (1968). Food overlap among coexisting sandpipers on northern Alaskan tundra. Systematics of Zoology 17: 305-318.
37.
Houle A, Chapman CA, Vickery WL (2010). Intratree vertical variation of fruit density and the nature of contest competition in frugivores. Behavioral Ecology and Sociobiology 64: 429-441.
38.
Isbell LA (1991). Contest and scramble competition: patterns of female aggression and ranging behavior among primates. Behavioral Ecology 2: 143-155.
39.
Jaffe KE, Isbell LA (2011). The guenons: polyspecific associations in socioecological perspective. In Primates in Perspective (Campbell C, Fuentes A, MacKinnon K, Bearder S, Stumpf R, eds.), pp 277-300. Oxford, Oxford University Press.Koné I, Gonedelé Bi S, Osei S, Wiafe E, Dempsey A, McGraw WS, Oates JF (2017). Cercopithecus roloway. In IUCN Red List of Threatened Species. Version 2017.
40.
Kane EE (2017). Socioecology, stress, and reproduction among female Diana monkeys (Cercopithecus diana) in Cote d'Ivoire's Tai National Park. PhD thesis, The Ohio State University, Columbus.
41.
Lambert JE (2007). Seasonality, fallback strategies, and natural selection: a chimpanzee and cercopithecoid model for interpreting the evolution of hominin diet. In Evolution of the Human Diet: The Known, the Unknown, and the Unknowable (Ungar PS, ed.), pp 324-343. Oxford, Oxford University Press.
42.
Martin TW (1985). Resource selection by tropical frugivorous birds: integrating multiple interactions. Oecologia 66: 563-573.
43.
McGraw WS (2007). Vulnerability and conservation of the Tai Forest monkeys. In Monkeys of the TaiForest: An African Primate Community (McGraw WS, Zuberbühler K, Noe R, eds.), pp 290-316. Cambridge, Cambridge University Press.
44.
McGraw WS, Bshary R (2002). Association of terrestrial mangabeys (Cercocebus atys) with arboreal monkeys: experimental evidence for the effects of reduced ground predator pressure on habitat use. International Journal of Primatology 23: 311-325.
45.
McGraw WS, Zuberbühler K (2007). The monkeys of the Taï Forest: an introduction. In Monkeys of the Taï Forest: An African Primate Community (McGraw WS, Zuberbühler K, Noë R, eds.), pp 1-48. Cambridge, Cambridge University Press.
46.
McGraw WS, Zuberbühler K (2008). Socioecology, predation, and cognition in a community of West African monkeys. Evolutionary Anthropology 17: 254-266.
47.
McGrew WC (1998). Culture in nonhuman primates? Annual Review of Anthropology 27: 301-328.
48.
Milich KM, Stumpf RM, Chambers JM (2014). Female red colobus monkeys maintain an ideal free distribution through novel foraging strategies in logged forests. American Journal of Physical Anthropology 154: 52-60.
49.
Oates JF (1988). The distribution of Cercopithecus monkeys in West African forests. In A Primate Radiation: Evolutionary Biology of the African Guenons (Gautier-Hion A, Bourlière F, Gautier JP, eds.), pp 79-103. New York, Cambridge University Press.
50.
Oates JF, Gippoliti S, Groves CP (2016). Cercopithecusroloway. The IUCN Red List of Threatened Species 2016: e.T4232A92375108. . Downloaded on December 7, 2017.
51.
Oates JF, Whitesides GH (1990). Association between olive colobus (Procolobus verus), Diana guenons (Cercopithecus diana), and other forest monkeys in Sierra Leone. American Journal of Primatology 21: 129-146.
52.
Pazol K, Cords M (2005). Seasonal variation in feeding behavior, competition and female social relationships in a forest dwelling guenon, the blue monkey (Cercopithecus mitis stuhlmanni) in the Kakamega Forest, Kenya. Behavioral Ecology and Sociobiology 58: 566-577.
53.
Perry S, Manson JH (2003). Traditions in monkeys. Evolutionary Anthropology 12: 71-81.
54.
Pielou EC (1966). The measurement of diversity in different types of biological collections. Journal of Theoretical Biology 13: 131-144.
55.
Porter LM, Garber PA (2007). Niche expansion of a cryptic primate, Callimico goeldii, while in mixed species troops. American Journal of Primatology 69: 1340-1353.
56.
Refisch J, Koné I (2005). Impact of commercial hunting on monkey populations in the Taï region, Côte d'Ivoire. Biotropica 37: 136-144.
57.
Rudran R (1978). Socioecology of the blue monkeys (Cercopithecus mitis stuhlmanni) of the Kibale Forest, Uganda. Smithsonian Contributions to Zoology 249: 148-236.
58.
Struhsaker TT (1997). Ecology of an African Rain Forest. Gainesville, University Press of Florida.
59.
Struhsaker TT (2010). The Red Colobus Monkeys: Variation in Demography, Behavior, and Ecology of Endangered Species. Oxford, Oxford University Press.
60.
Struhsaker TT (2017). Dietary variability in redtail monkeys (Cercopithecus ascanius schmidti) of Kibale National Park, Uganda: the role of time, space, and hybridization. International Journal of Primatology 38: 914-941.
61.
Terborgh J (1983). Five New World Primates: A Study in Comparative Ecology. Princeton, Princeton University Press.
62.
Terborgh J (1990). Mixed flocks and polyspecific associations: costs and benefits of mixed groups to birds and monkeys. American Journal of Primatology 21: 87-100.
63.
Tesfaye D, Fashing PJ, Bekele A, Mekonnen A, Atickem A (2013). Ecological flexibility in Boutourlini's blue monkeys (Cercopihecus mitis boutourlinii) in Jiba Forest, Ethiopia: a comparison of habitat use, ranging behavior, and diet in intact and fragmented forest. International Journal of Primatology 34: 615-640.
64.
Tournier E, Tournier V, van de Waal E, Barrett A, Brown L, Bshary R (2014). Differences in diet between six neighbouring groups of vervet monkeys. Ethology 120: 1-12.
65.
Tutin CEG, Ham RM, White LJT, Harrison MJS (1997). The primate community of the Lopé Reserve, Gabon: diets, responses to fruit scarcity, and effects on biomass. American Journal of Primatology 42: 1-24.
66.
Tutin CEG (1999). Fragmented living: behavioural ecology of primates in a forest fragment in the Lopé Reserve, Gabon. Primates 40: 249-265.
67.
Wachter B, Schabel M, Noe R (1997). Diet overlap and polyspecific associations of red colobus and Diana monkeys in the Taï park, Ivory Coast. Ethology 103: 126.
68.
Whitesides GH (1991). Patterns of Foraging, Ranging, and Interspecific Associations of Diana Monkeys ( Cercopithecus diana) in Sierra Leone, West Africa. PhD thesis, University of Miami.
69.
Wolters S, Zuberbühler K (2003). Mixed-species associations of Diana and Campbell's monkeys: the costs and benefits of a forest phenomenon. Behaviour 140: 371-385.
70.
Zuberbühler K, Jenny D (2002). Leopard predation and primate evolution. Journal of Human Evolution 43: 873-886.
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