Behavioral and physiological responses to fruit availability of spider monkeys ranging in a small forest fragment

American Journal of Primatology

Volumn 76, Issue 11, 2014, Pages 1049-1061

  Rimbach, Rebecca ^a,b   Link, Andrés ^b,c,d   Montes Rojas, Andrés ^b,e   Di Fiore, Anthony ^b,d   Heistermann, Michael ^a   Heymann, Eckhard W ^a  

^a GERMAN PRIMATE CENTER   (Germany)

^b Fundacion Proyecto Primates   (Colombia)

^c UNIVERSIDAD DE LOS ANDES   (Colombia)

^d UNIVERSITY OF TEXAS AT AUSTIN   (United States)

^e UNIVERSIDAD DEL TOLIMA   (Colombia)

Author keywords

Aggression; Fission fusion dynamics; Glucocorticoid metabolites; Habitat fragmentation; Spider monkeys

Indexed keywords

ATELES SP.;

GLUCOCORTICOID;

AGGRESSION; ANIMAL; ANIMAL BEHAVIOR; ATELINAE; CATERING SERVICE; CHEMISTRY; COLOMBIA; DIET; ECOSYSTEM; FECES; FEEDING BEHAVIOR; FEMALE; FOREST; FRUIT; MALE; PHYSIOLOGICAL STRESS; PHYSIOLOGY; PSYCHOLOGY; SOCIAL BEHAVIOR;

AGGRESSION; ANIMALS; ATELINAE; BEHAVIOR, ANIMAL; COLOMBIA; DIET; ECOSYSTEM; FECES; FEEDING BEHAVIOR; FEMALE; FOOD SUPPLY; FORESTS; FRUIT; GLUCOCORTICOIDS; MALE; SOCIAL BEHAVIOR; STRESS, PHYSIOLOGICAL;

EID: 84911092234     PISSN: 02752565     EISSN: 10982345     Source Type: Journal    
DOI: 10.1002/ajp.22292     Document Type: Article

References (126)

1. Abondano LA, Link A. 2012. The social behavior of brown spider monkeys (Ateles hybridus) in a fragmented forest in Colombia. International Journal of Primatology 33:769-783.
2. Aldana AM, Beltrán M, Torres-Neira J, Stevenson PR. 2008. Habitat characterization and population density of brown spider monkeys (Ateles hybridus) in Magdalena Valley, Colombia. Neotropical Primates 15:46-50.
3. Arroyo-Rodríguez V, Mandujano S. 2006. Forest fragmentation modifies habitat quality for Alouatta palliata. International Journal of Primatology 27:1079-1096.
4. Asensio N, Korstjens AH, Aureli F. 2009. Fissioning minimizes ranging costs in spider monkeys: a multiple-level approach. Behavioral Ecology and Sociobiology 63:649-659.
5. Asensio N, Korstjens AH, Schaffner CM, Aureli F. 2008. Intragroup aggression, fission-fusion dynamics and feeding competition in spider monkeys. Behaviour 145:983-1001.
6. Asensio N, Schaffner CM, Aureli F. 2012. Variability in core areas of spider monkeys (Ateles geoffroyi) in a tropical dry forest in Costa Rica. Primates 53:147-156.
7. Aureli F, Schaffner CM, Boesch C., et al. 2008. Fission-fusion dynamics: new research frameworks. Current Anthropology 49:627-654.
8. Baayen RH. 2010. Analyzing linguistic data, a practical introduction to statistics. Cambridge: Cambridge University Press.
9. Baayen RH. 2011. languageR: data sets and functions with "analyzing linguistic data: a practical introduction to statistics, " R package version 1.4. Available online at: http://cran.rproject.org/package=languageR.
10. Basabose AK. 2004. Fruit availability and chimpanzee party size at Kahuzi montane forest, Democratic Republic of Congo. Primates 45:211-219.
11. Bates D, Maechler M. 2010. lme4: linear mixed-effects models using S4 classes. R package version 0. 999375-37. Available online at: http://cran.rproject.org/package=lme4.
12. Behie AM, Pavelka MSM, Chapman CA. 2010. Sources of variation in fecal cortisol levels in howler monkeys in Belize. American Journal of Primatology 72:600-606.
13. Bilgener M. 1995. Chemical factors influencing food choice of howler monkey (Alouatta palliata). Turkish Journal of Zoology 19:291-303.
14. Boyle SA, Smith AT. 2010. Behavioral modifications in northern bearded saki monkeys (Chiropotes satanas chiropotes) in forest fragments of central Amazonia. Primates 51:43-51.
15. Breazile JE. 1987. Physiological-basis and consequences of distress in animals. Journal of the American Veterinary Medical Association 191:1212-1215.
16. Cavigelli SA. 1999. Behavioural patterns associated with faecal cortisol levels in free-ranging female ring-tailed lemurs, Lemur catta. Animal Behaviour 57:935-944.
17. Champion JE. 2013. The effects of a hurricane and fire on feeding ecology, activity budget, and social patterns of spider monkeys (Ateles geoffroyi) in Central Belize [MSc thesis]. Calgary (AB): University of Calgary.
18. Chapman CA. 1990a. Ecological constraints on group size in three species of Neotropical primates. Folia Primatologica 55:1-9.
19. Chapman CA. 1990b. Association patterns of spider monkeys: the influence of ecology and sex on social organization. Behavioral Ecology and Sociobiology 26:409-414.
20. Chapman CA, Saj TL, Snaith TV. 2007. Temporal dynamics of nutrition, parasitism, and stress in colobus monkeys: implications for population regulation and conservation. American Journal of Physical Anthropology 134:240-250.
21. Chapman CA, Wrangham RW, Chapman LJ. 1995. Ecological constraints on group size: an analysis of spider monkey and chimpanzee subgroups. Behavioral Ecology and Sociobiology 36:59-70.
22. Charbonnel N, Chaval Y, Berthier K., et al. 2008. Stress and demographic decline: a potential effect mediated by impairment of reproduction and immune function in cyclic vole populations. Physiological and Biochemical Zoology 81:63-73.
23. Chaves ÓM, Stoner KE, Arroyo-Rodríguez V. 2012. Differences in diet between spider monkey groups living in forest fragments and continuous forest in Mexico. Biotropica 44:105-113.
24. Coley PD, Barone JA. 1996. Herbivory and plant defenses in tropical forests. Annual Review of Ecology and Systematics 27:305-335.
25. Cordeiro NJ, Howe HF. 2001. Low recruitment of trees dispersed by animals in African forest fragments. Conservation Biology: the Journal of the Society for Conservation Biology 15:1733-1741.
26. Couzin ID. 2006. Behavioral ecology: social organization in fission-fusion. Current Biology 16:169-171.
27. Creel S. 2005. Dominance, aggression, and glucocorticoid levels in social carnivores. Journal of Mammalogy 86:255-264.
28. Creel S, Creel NM, Monfort SL. 1996. Social stress and dominance. Nature 379:212.
29. Cristóbal-Azkarate J, Chavira R, Boeck L, Rodríguez-Luna E, Veàl JJ. 2006. Testosterone levels of free-ranging resident mantled howler monkey males in relation to the number and density of solitary males: a test of the challenge hypothesis. Hormones and Behavior 49:261-267.
30. Cristóbal-Azkarate J, Dias PAD, Veá JJ. 2004. Causes of intraspecific aggression in Alouatta palliata mexicana: evidence from injuries, demography, and habitat. International Journal of Primatology 25:939-953.
31. Crockford C, Wittig RM, Whitten PL, Seyfarth RM, Cheney DL. 2008. Social stressors and coping mechanisms in wild female baboons (Papio hamadryas ursinus). Hormones and Behavior 53:254-265.
32. Di Fiore A, Campbell CJ. 2007. The atelines: variation in ecology, behavior, and social organization. In: Campbell CJ, Fuentes A, MacKinnon KC, Panger M, Bearder SK, editors. Primates in perspective. New York: Oxford University Press. p 155-185.
33. Di Fiore A, Link A, Campbell CJ. 2010. The atelines: behavioral and socioecological diversity in a New World radiation. In: Campbell CJ, Fuentes A, MacKinnon KC, Panger M, Beader SK, editors. Primates in perspective. 2nd edition. Oxford: Oxford University Press. p 155-188.
34. Dunbar RIM. 1987. Primate social systems. Ithaca: Cornell University Press.
35. Dunn JC, Cristóbal-Azkarate J, Veà JJ. 2010. Seasonal variations in the diet and feeding effort of two groups of howlers in different sized forest fragments. International Journal of Primatology 31:887-903.
36. Ellenberg U, Setiawan AN, Cree A, Houston DM, Seddon PJ. 2007. Elevated hormonal stress response and reduced reproductive output in yellow-eyed Penguins exposed to unregulated tourism. General and Comparative Endocrinology 152:54-63.
37. Ellis EC, Klein Goldewijk K, Siebert S, Lightman D, Ramankutty N. 2010. Anthropogenic transformation of the biomes, 1700-2000. Global Ecology and Biogeography 19:589-606.
38. Emery Thompson M, Muller MN, Kahlenberg SM, Wrangham RW. 2010. Dynamics of social and energetic stress in wild female chimpanzees. Hormones and Behavior 58:440-449.
39. Fedigan LM, Baxter MJ. 1984. Sex differences and social organization in free-ranging spider monkeys (Ateles geoffroyi). Primates 25:279-294.
40. Felton AM, Felton A, Wood J, Lindenmayer D. 2008. Diet and feeding ecology of Ateles chamek in a Bolivian semihumid forest: the importance of ficus as a staple food resource. International Journal of Primatology 29:379-403.
41. Field A. 2005. Discovering statistics using SPSS. London: Sage Publications.
42. Foley CAH, Papageorge S, Wasser SK. 2001. Noninvasive stress and reproductive measures of social and ecological pressures in free-ranging African elephants. Conservation Biology: the Journal of the Society for Conservation Biology 15:1134-1142.
43. Foley JA, Defries R, Asner GP, et al. 2005. Global consequences of land use. Science 309:570-574.
44. Fox J, Weisberg S. 2011. An R companion to applied regression. 2nd edition. London: Sage Publications.
45. French SS, Denardo DF, Greives TJ, Strand CR, Demas GE. 2010. Human disturbance alters endocrine and immune responses in the Galapagos marine iguana (Amblyrhynchus cristatus). Hormones and Behavior 58:792-799.
46. Ganswindt A, Palme R, Heistermann M, Borragan S, Hodges JK. 2003. Non-invasive assessment of adrenocortical function in the male African elephant (Loxodonta africana) and its relation to musth. General and Comparative Endocrinology 134:156-166.
47. Ganzhorn JU. 1995. Low-level forest disturbance effects on primary production, leaf chemistry, and lemur populations. Ecology 76:2084-2096.
48. Ganzhorn JU. 1997. Habitat characteristics and lemur species richness in Madagascar. Biotropica 29:331-343.
49. Gesquiere LR, Khan M, Shek L, et al. 2008. Coping with a challenging environment: effects of seasonal variability and reproductive status on glucocorticoid concentrations of female baboons (Papio cynocephalus). Hormones and Behavior 54:410-416.
50. González-Zamora A, Arroyo-Rodríguez V, Chaves ÒM, et al. 2009. Diet of spider monkeys (Ateles geoffroyi) in Mesoamerica: current knowledge and future directions. American Journal of Primatology 71:8-20.
51. Goymann W, East ML, Wachter B, et al. 2001. Social, state-dependent and environmental modulation of faecal corticosteroid levels in free-ranging female spotted hyenas. Proceedings of the Royal Society of London Series B Biological Sciences 268:2453-2459.
52. Hackländer K, Möstl E, Walter A. 2003. Reproductive suppression in female Alpine marmots, Marmota marmota. Animal Behaviour 65:1133-1140.
53. Hargis CD, Bissonette JA, Turner DL. 1999. The influence of forest fragmentation and landscape pattern on American martens. Journal of Applied Ecology 36:157-172.
54. Hashimoto C, Suzuki S, Takenoshita Y, et al. 2003. How fruit abundance affects the chimpanzee party size: a comparison between four study sites. Primates 44:77-81.
55. Heistermann M, Ademmer C, Kaumanns W. 2004. Ovarian cycle and effect of social changes on adrenal and ovarian function in Pygathrix nemaeus. International Journal of Primatology 25:689-708.
56. Hohmann G, Fruth B. 2002. Dynamics in social organization of bonobos (Pan paniscus). In: Boesch C, Hohmann G, Marchant L, editors. Behavioural diversity in chimpanzees and bonobos. New York: Cambridge University Press. p 138-150.
57. Holekamp KE, Cooper SM, Katona CI, et al. 1997. Patterns of association among female spotted hyenas (Crocuta crocuta). Journal of Mammalogy 78:55-64.
58. IDEAM. 2008. Instituto de hidrologia, meteorologia y estudios ambientales de Colombia, http://www.ideam.gov.co.
59. Irwin MT. 2007. Feeding ecology of Propithecus diadema in forest fragments and continuous forest. International Journal of Primatology 29:95-115.
60. Irwin MT. 2008. Diademed sifaka (Propithecus diadema) ranging and habitat use in continuous and fragmented forest: higher density but lower viability in fragments? Biotropica 40:231-240.
61. Itani J, Suzuki A. 1967. The social unit of chimpanzees. Primates 8:355-381.
62. Itoh N, Nishida T. 2007. Chimpanzee grouping patterns and food availability in Mahale Mountains National Park, Tanzania. Primates 48:87-96.
63. Janson CH. 2000. Primate socio-ecology: the end of a golden age. Evolutionary Anthropology 9:73-86.
64. Johns AD. 1988. Effects of "selective" timber extraction on rain forest structure and composition and some consequences for frugivores and folivores. Biotropica 20:31-37.
65. Johns AD. 1991. Forest disturbance and Amazonian primates. In: Box HO, editor. Primate responses to environmental change. New York: Chapman and Hall. p 115-135.
66. Juan S, Estrada A, Coates-Estrada R. 2000. Contrastes y similitudes en el uso de recursos y patrón general de actividades en tropas de monos aulladores (Alouatta palliata) en fragmentos de selva de Los Tuxtlas, México. Neotropical Primates 8:131-135.
67. Kano T. 1982. The social group of pygmy chimpanzees (Pan paniscus) of Wamba. Primates 23:171-188.
68. Kitaysky AS, Wingfield JC, Piatt JF. 1999. Dynamics of food availability, body condition and physiological stress response in breeding Black-legged Kittiwakes. Functional Ecology 13:577-584.
69. Klein LL. 1972. The ecology and social organzation of the spider monkey, Ateles belzebuth [dissertation]. Berkeley (CA): University of Carlifornia.
70. Klein LL, Klein DJ. 1977. Feeding behaviour of the Colombian spider monkey, Ateles belzebuth. In: Clutton-Brock TH, editor. Primate ecology: studies of feeding and ranging behavior in lemurs, monkeys, and apes. London: Academic Press. p 153-181.
71. Kummer H. 1971. Primate societies: group techniques of ecological adaptation. Chicago: Aldine.
72. Laurance WF, Laurance SG, Ferreira LV, et al. 1997. Biomass collapse in Amazonian forest fragments. Science 278:1117-1118.
73. Leighton M, Leighton DR. 1982. The relationship of size of 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.
74. Link A, de Luna AG, Alfonso F, Giraldo-Beltran P, Ramirez F. 2010. Initial effects of fragmentation on the density of three neotropical primate species in two lowland forests of Colombia. Endangered Species Research 13:41-50.
75. Link A, de Luna AG, Burbano J. 2013. Estado de conservación de uno de los primates más amenazados con la extinción: el mono araña café (Ateles hybridus). In: Defler TR, Stevenson PR, Bueno ML, Guzman D, editors. Primates Colombianos en peligro de extinción. Bogotá: Asociación Primatológica Colombiana.
76. Lopez GO, Terborgh J, Ceballos N. 2005. Food selection by a hyperdense population of red howler monkeys (Alouatta seniculus). Journal of Tropical Ecology 21:445-450.
77. Lynch J, González A. 1993. Canopy nutrient allocation in relation to incident light in the tropical fruit tree Borojoa patinoi (Cuatr.). Journal of the American Society for Horticultural Science 118:777-785.
78. Macdonald DW, Harmsen BJ, Johnson PJ, Newman C. 2004. Increasing frequency of bite wounds with increasing population density in Eurasian badgers, Meles meles. Animal Behaviour 67:745-751.
79. Martin LB. 2009. Stress and immunity in wild vertebrates: timing is everything. General and Comparative Endocrinology 163:70-76.
80. McComb K, Packer C, Pusey A. 1994. Roaring and numerical assessment in contest between groups of female lions, Panthera leo. Animal Behaviour 47:379-387.
81. Menon S, Poirier FE. 1996. Lion-tailed macaques (Macaca silenus) in a disturbed forest fragment: activity patterns and time budget. International Journal of Primatology 17:969-985.
82. Mittermeier RA, Rylands AB, Taylor LA, et al. 2012. Primates in peril: the World's 25 most endangered primates 2012-2014. IUCN/SSC Primate Specialist Group (PSG). International Primatological Society (IPS), Conservation International (CI), and Bristol Conservation and Science Foundation, Bristol, UK.
83. Montes-Rojas AF. 2012. Caracterización de la dieta y evaluación nutricional de los alimentos mas consumidos por Ateles hybridus en un fragmento de bosque en San Juan del Carare, Colombia [Bsc thesis]. Colombia: Universidad de Tolima.
84. Moscovice LR, Issa MH, Petrzelkova KJ, et al. 2007. Fruit availability, chimpanzee diet, and grouping patterns on Rubondo Island, Tanzania. American Journal of Primatology 69:487-502.
85. Newton-Fisher NE, Reynolds V, Plumptre AJ. 2000. Food supply and chimpanzee (Pan troglodytes schweinfurthii) party size in the Budongo Forest Reserve, Uganda. International Journal of Primatology 21:613-628.
86. Nishida T, Hiraiwa-Hasegawa M. 1987. Chimpanzees and bonobos: cooperative relationships among males. In: Smuts BB, Cheney DL, Seyfarth RM, Wrangham RW, Struhsaker TT, editors. Primate Societies. Chicago: The University of Chicago Press. p 165-180.
87. Packer C, Scheel D, Pusey AE. 1990. Why lions form groups: food is not enough. American Naturalist 136:1-19.
88. Peters RH, Clontier S, Dubé D, et al. 1988. The allometry of the weight of fruit on trees and shrubs in Barbados. Oecologia 74:612-616.
89. Pickering AD, Pottinger TG, Sumpter JP, Carragher JF, Le Bail PY. 1991. Effects of acute and chronic stress on the levels of circulating growth hormone in the rainbow trout, Oncorhynchus mykiss. General and Comparative Endocrinology 83:86-93.
90. Pimm SL, Raven P. 2000. Biodiversity: extinction by numbers. Nature 403:843-845.
91. Popa-Lisseanu AG, Bontadina F, Mora O, Ibáñez C. 2008. Highly structured fission-fusion societies in an aerial-hawking, carnivorous bat. Animal Behaviour 75:471-482.
92. Potts KB. 2011. The long-term impact of timber harvesting on the resource base of chimpanzees in Kibale National Park, Uganda. Biotropica 43:256-264.
93. Pride RE. 2005. Foraging success, agonism, and predator alarms: behavioral predictors of cortisol in Lemur catta. International Journal of Primatology 26:295-319.
94. Putz FE, Leigh EGJ, Wright SJ. 1990. Solitary confinement in Panama. Garden 2:18-23.
95. Ramos-Fernández G. 2005. Vocal communication in a fission-fusion society: do spider monkeys stay in touch with close associates? International Journal of Primatology 26:1077-1092.
96. Restrepo J, Zapata P, Diaz J, Garzonferreira J, Garcia C. 2006. Fluvial fluxes into the Caribbean Sea and their impact on coastal ecosystems: the Magdalena River, Colombia. Global and Planetary Change 50:33-49.
97. Rimbach R, Heymann EW, Link A, Heistermann M. 2013. Validation of an enzymeimmunoassay for assessing adrenocortical activity and characterization of factors that affect fecal glucocorticoid metabolite levels in two New World primates. General and Comparative Endocrinology 191:13-23.
98. Romero LM, Wikelski M. 2001. Corticosterone levels predict survival probabilities of Galápagos marine iguanas during El Niño events. Proceedings of the National Academy of Sciences of the United States of America 98:7366-7370.
99. Scarry CJ. 2013. Between-group contest competition among tufted capuchin monkeys, Sapajus nigritus, and the role of male resource defence. Animal Behaviour 85:931-939.
100. Schaffner CM, Rebecchini L, Ramos-Fernandez G, Vick LG, Aureli F. 2012. Spider monkeys (Ateles geoffroyi yucatenensis) cope with the negative consequences of hurricanes through changes in diet, activity budget, and fission-fusion dynamics. International Journal of Primatology 33:922-936.
101. Selye H. 1956. The stress of life. New York: McGraw-Hill.
102. Setchell JM, Smith T, Wickings EJ, Knapp LA. 2010. Stress, social behaviour, and secondary sexual traits in a male primate. Hormones and Behavior 58:720-728.
103. Shimooka Y. 2003. Seasonal variation in association patterns of wild spider monkeys (Ateles belzebuth belzebuth) at La Macarena, Colombia. Primates 44:83-90.
104. Shorrocks B, Croft DP. 2009. Necks and networks: a preliminary study of population structure in the reticulated giraffe (Giraffa camelopardalis reticulata de Winston). African Journal of Ecology 47:374-381.
105. Shutt K, Setchell JM, Heistermann M. 2012. Non-invasive monitoring of physiological stress in the Western lowland gorilla (Gorilla gorilla gorilla): validation of a fecal glucocorticoid assay and methods for practical application in the field. General and Comparative Endocrinology 179:167-177.
106. Slater KY, Schaffner CM, Aureli F. 2008. Female-directed male aggression in wild spider monkeys (Ateles geofforyi yucatanensis). International Journal of Primatology 29:1657-1669.
107. Slater KY, Schaffner CM, Aureli F. 2009. Sex differences in the social behavior of wild spider monkeys (Ateles geoffroyi yucatanensis). American Journal of Primatology 71:21-29.
108. Stevenson PR. 2002. Frugivory and seed dispersal by woolly monekys (Lagothrix lagothricha) at Tinigua Park, Colomiba [dissertation]. Stony Brook (NY): Stony Brook University.
109. Stevenson PR. 2004. Phenological patterns of woody vegetation at Tinigua Park, Colombia: methodological comparisons with emphasis on fruit production. Caldasia 26:125-150.
110. Stevenson PR, Quinoñes MJ, Ahumada JA. 1994. Ecological strategies of woolly monkeys (Lagothrix lagotricha) at Tinigua National Park, Colombia. American Journal of Primatology 32:123-140.
111. Stratakis CA, Chrousos GP. 1995. Neuroendocrinology and pathophysiology of the stress system. Annals of the New York Academy of Sciences 77:1-18.
112. Strier KB. 1992. Atelinae adaptations: behavioral strategies and ecological constraints. American Journal of Physical Anthropology 88:515-524.
113. Symington MM. 1987. Ecological and social correlates of party size in the black spider monkey, Ateles paniscus chamek [dissertation]. Princton (NJ): Princton University.
114. Symington MM. 1988. Food competition and foraging party size in the black spider monkey (Ateles paniscus chamek). Behaviour 105:117-134.
115. Tesfaye D, Fashing PJ, Bekele A, Mekonnen A, Atickem A. 2013. Ecological flexibility in Boutourlini's blue monkeys (Cercopithecus mitis boutourlinii) in Jibat Forest, Ethiopia: a comparison of habitat use, ranging behavior, and diet in intact and fragmented forest. International Journal of Primatology 34:615-640.
116. Turner IM. 1996. Species loss in fragments of tropical rain forest: a review of the evidence. Journal of Applied Ecology 33:200-209.
117. Tutin CEG. 1999. Fragmented living: behavioural ecology of primates in a forest fragment in the Lopé Reserve, Gabon. Primates 40:249-265.
118. Umapathy G, Hussain S, Shivaji S. 2011. Impact of habitat fragmentation on the demography of lion-tailed macaque (Macaca silenus) populations in the rainforest of Anamalai Hills, Western Ghats, India. International Journal of Primatology 32:889-900.
119. Urbani B, Morales AL, Link A, Stevenson PR. 2008. Ateles hybridus. In: IUCN 2010. IUCN red list of threatened species. Version 2010.1. Available online at: http://www.iucnredlist.org. [accessed May 11, 2010].
120. Wakefield ML. 2008. Grouping patterns and competition among female Pan troglodytes schweinfurthii at Ngogo, Kibale National Park, Uganda. International Journal of Primatology 29:907-929.
121. Wallner B, Möstl E, Dittami J, Prossinger H. 1999. Fecal glucocorticoids document stress in female barbary macaques (Macaca sylvanus). General and Comparative Endocrinology 113:80-86.
122. Waterman PG, Kool KM. 1994. Colobine food selection and plant chemistry. In: Davies AG, Oates JF, editors. Colobine monkeys: their ecology, behaviour and evolution. Cambridge: Cambridge University Press. p 251-284.
123. Wauters J, Casale P, Dhondt AA. 1994. Space use and dispersal of red squirrels in fragmented habitats. Oikos 69:140-146.
124. Würsig B. 1978. Occurence and group organization of Atlantic bottlenose porpoises (Tursiops truncatus) in an Argentinian bay. The Biological Bulletin 154:348-359.
125. Zuur AF, Ieno EN, Elphick CS. 2010. A protocol for data exploration to avoid common statistical problems. Methods in Ecology and Evolution 1:3-14.
126. Zuur AF, Ieno EN, Walker NJ, Saveliev AA, Smith GM. 2009. Mixed effetcs models and extensions in ecology with R. New York: Springer.