Relative growth, ontogeny, and sexual dimorphism in Gorilla (Gorilla gorilla gorilla and G. g. beringei): Evolutionary and ecological considerations

American Journal of Primatology

Volumn 43, Issue 1, 1997, Pages 1-31

  Taylor, Andrea B ^a,b  

^a SLIPPERY ROCK UNIVERSITY   (United States)

^b SAMUEL MERRITT COLLEGE   (United States)

Author keywords

Allometry; Ecology; Gorillas; Ontogeny; Relative growth; Scaling; Sexual dimorphism

Indexed keywords

EASTERN MOUNTAIN GORILLA; GORILLA; GROWTH; ONTOGENY; RELATIVE GROWTH; SEXUAL DIMORPHISM; WESTERN MOUNTAIN GORILLA;

ANIMAL; ANTHROPOMETRY; ARTICLE; BODY CONSTITUTION; BONE; EVOLUTION; FEMALE; GORILLA; GROWTH, DEVELOPMENT AND AGING; HISTOLOGY; LOCOMOTION; MALE; SEX RATIO;

ANIMALS; ANTHROPOMETRY; BODY CONSTITUTION; BONE AND BONES; EVOLUTION; FEMALE; GORILLA GORILLA; LOCOMOTION; MALE; SEX DISTRIBUTION;

ANIMALIA; GORILLA BERINGEI; GORILLA GORILLA BERINGEI; GORILLA GORILLA GORILLA; HOMO; PRIMATES;

EID: 0030754293     PISSN: 02752565     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1098-2345(1997)43:1<1::AID-AJP1>3.0.CO;2-0     Document Type: Article

References (115)

1. Akeley, C.E. IN BRIGHTEST AFRICA. New York, Doubleday Press, 1923.
2. Alexander, R.D.; Hoogland, J.L.; Howard, R.D.; Noonan, K.M.; Sherman, P.W. Sexual dimorphism and breeding systems in pinnipeds, ungulates, primates, and humans. Pp. 402-435 in EVOLUTIONARY BIOLOGY AND HUMAN SOCIAL BEHAVIOR: AN ANTHROPOLOGICAL PERSPECTIVE. N.A. Chagnon; W. Irons, eds. North Scituate Massachusetts, Duxbury Press, 1979.
3. Ashton, E.H.; Zuckerman, S. Some quantitative dental characteristics of the chimpanzee, gorilla, and orang-utan. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY LONDON [BIOLOGY] 234:471-484, 1950.
4. Bingham, H.C. GORILLAS IN A NATIVE HABITAT. Washington, D.C., Carnegie Institute of Washington Publication, VOL. 426, 1932.
5. Bogin, B. PATTERNS OF HUMAN GROWTH. New York, Cambridge University Press, 1988.
6. Byrne, R.W.; Byrne, J.M.E. Complex leaf-gathering skills of mountain gorillas (Gorilla g. beringei): Variability and standardization. AMERICAN JOURNAL OF PRIMATOLOGY 31:241-261, 1993.
7. Calder, W.A. SIZE, FUNCTION, AND LIFE HISTORY. Cambridge, Harvard University Press, 1984.
8. Cant, J.G.H. Effects of sexual dimorphism in body size on feeding postural behavior of Sumatran orangutans (Pongo pygmaeus). AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 88:273-283, 1987.
9. Cartmill, M. Pads and claws in arboreal locomotion, Pp. 45-83 in PRIMATE LOCOMOTION. F.A. Jenkins, Jr., ed. New York, Academic Press, 1974.
10. Cheverud, J.; Dow, M.M.; Leutenegger, W. The quantitative assessment of phylogenetic constraints in comparative analyses: Sexual dimorphism in body weight among primates. EVOLUTION 39:1335-1351, 1985.
11. Chivers, D.J.; Hladik, C.M. Diet and gut morphology in primates. Pp. 213-230 in FOOD ACQUISITION AND PROCESSING IN PRIMATES. D.J. Chivers; B.A. Wood; A. Bilsborough, eds. New York, Plenum Press, 1984.
12. Clutton-Brock, T.H.; Harvey, P.H. Species differences in feeding and ranging behaviour in primates. Pp. 557-578 in PRIMATE ECOLOGY. T.H. Clutton-Brock, ed. London, Academic Press, 1977a.
13. Clutton-Brock, T.H.; Harvey, P.H. Home range size, population density and phylogeny in primates. Pp. 201-214 in PRIMATE ECOLOGY AND HUMAN ORIGINS. I.S. Berinstein; E.O. Smith, eds. New York, Garland Press, 1979.
14. Cock, A.G. Genetical aspects of metrical growth and form in animals. QUARTERLY REVIEW OF BIOLOGY 41:131-190, 1966.
15. Coolidge, H.J., Jr., A revision of the genus Gorilla. MEMOIRS OF THE MUSEUM OF COMPARATIVE ZOOLOGY, HARVARD 50:293-381, 1929.
16. Darwin, C. THE DESCENT OF MAN AND SELECTION IN RELATION TO SEX. London, John Murray, 1871.
17. Dean, M.C.; Wood, B.A. Developing pongid dentition and its use for ageing individual crania in comparative cross-sectional growth studies. FOLIA PRIMATOLOGICA 36:111-127, 1981.
18. Demment, M.W.; van Soest, P.J. A nutritional explanation for body-size patterns of ruminant and nonruminant herbivores. AMERICAN NATURALIST 125:641-672, 1985.
19. Donisthorpe, J.H. A pilot study of the mountain gorilla (Gorilla gorilla beringei) in South West Uganda, February to September 1957. SOUTH AFRICAN JOURNAL OF SCIENCE 54:195-217, 1958.
20. Doran, D.M. Sex differences in adult chimpanzee positional behavior: The influence of body size on locomotion and posture. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 91:99-115, 1993a.
21. Doran, D.M. The comparative locomotor behavior of chimpanzees and bonobos: The influence of morphology on locomotion. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 91:83-98, 1993b.
22. Doran, D.M. Comparative positional behavior of the African apes. Pp. 213-224 in GREAT APE SOCIETIES. W.C. McGrew; L.F. Marchant; T. Nishida, eds. Cambridge, Cambridge University Press, 1996.
23. Doran, D.M.; Hunt, K.D. Comparative locomotor behavior of chimpanzees and bonobos: Species and habitat differences. Pp. 93-108 in CHIMPANZEE CULTURES. R.W. Wrangham; W.C. McGrew; F.B.M. de Waal; P.G. Heltne, eds. Cambridge, Harvard University Press, 1994.
24. Emlen, J.T.; Schaller, G.B. Distribution and status of the mountain gorilla (Gorilla gorilla beringei). ZOOLOGICA 45:41-52, 1960.
25. Fleagle, J.G.; Mittermeier, R.A. Locomotor behavior, body size and comparative ecology of 7 surinam monkeys. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 52:301-314, 1980.
26. Fossey, D.; Harcourt, A.H. Feeding ecology of free ranging mountain gorillas. Pp. 415-447 in PRIMATE ECOLOGY. T.H. Clutton-Brock, ed. London, Academic Press, 1977.
27. Galdikas, B.M.; Teleki, G. Variations in subsistence activities of female and male pongids: New perspectives on the origins of hominid division of labor. CURRENT ANTHROPOLOGY 22:241-256, 1981.
28. Gaulin, S.J.C. A Jarman/Bell model of primate feeding niches. HUMAN ECOLOGY 7:1-20, 1979.
29. Gaulin, S.J.C.; Sailer, L.D. Sexual dimorphism in weight among the primates: The relative importance of allometry and sexual selection. INTERNATIONAL JOURNAL OF PRIMATOLOGY 5:515-535, 1984.
30. Gavan, J. A. Growth and development of the chimpanzee: A longitudinal and comparative study. HUMAN BIOLOGY 25:99-143, 1953.
31. Gavan, J.A. Longitudinal, postnatal growth in chimpanzees. Pp. 46-102 in THE CHIMPANZEE, VOL. 4. Basel, Karger, 1971.
32. Godfrey, L. Dental development in fossil lemurs: Phylogenetic and ecological interpretations. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY SUPPLEMENT 16:96, 1993.
33. Godfrey, L. Heterochrony in extinct and extant lemurs of Madagascar. AAAS ANNUAL MEETING AND SCIENCE INNOVATION EXPOSITION 162:A12, 1996.
34. Goodall, J. THE CHIMPANZEES OF GOMBE: PATTERNS OF BEHAVIOR. Cambridge, Belknap Press, 1986.
35. Goodall, J.; Bandora, A.; Bergman, E.; Busse, C; Hilali, M.; Mpongo, E.; Pearce, A.; Riss, D. Intercommunity interactions of the chimpanzee population of the Gombe National Park. Pp. 13-53 in THE GREAT APES. D.A. Hamburg; E.R. McCown, eds. Menlo Park, Benjamin/Cummings, 1978.
36. Groves, C.P. GORILLAS. London, Barker, 1970.
37. Groves, C.P.; Stott, K.W. Systematic relationships of gorillas from Kahuzi, Tshiaberimu and Kayonza. FOLIA PRIMATOLOGICA 32:161-179, 1979.
38. Harcourt, A.H.; Fossey, D.; Stewart, K.J.; Watts, D.P. Reproduction in the wild gorillas and some comparisons with chimpanzees. JOURNAL OF REPRODUCTION AND FERTILITY [SUPPLEMENT] 28:59-60, 1980.
39. Hladik, C.M. Adaptive strategies of primates in relation to leaf-eating. Pp. 373-395 in THE ECOLOGY OF ARBOREAL FOLIVORES. G.G. Montgomery, ed. Washington, D.C., Smithsonian, 1978.
40. Hylander, W.L. The functional significance of primate mandibular form. JOURNAL OF MORPHOLOGY 106:223-240, 1979.
41. Inouye, S.E. Ontogeny and allometry of African ape manual rays. JOURNAL OF HUMAN EVOLUTION 23:107-138, 1992.
42. Inouye, S.E. Ontogeny of knuckle-walking hand postures in African apes. JOURNAL OF HUMAN EVOLUTION 26:459-485, 1994.
43. Janson, C.H.; van Schaik, C.P. Ecological risk aversion in juvenile primates: Slow and steady wins the race. Pp. 57-76 in JUVENILE PRIMATES. M.E. Pereira; L.A. Fairbanks, eds. New York, Oxford University Press, 1993.
44. Jarman, P.J. The social organization of antelope in relation to their ecology. BEHAVIOR 58:215-267, 1974.
45. Jungers, W.L. The functional significance of skeletal allometry in Megaladapis in comparison to living prosimians. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 19:303-314, 1978.
46. Jungers, W.L. Locomotion, limb proportions and skeletal allometry in lemurs and lorises. FOLIA PRIMATOLOGICA 32:8-28, 1979.
47. Jungers, W.L. Body size and scaling of limb proportions in primates. Pp. 345-381 in SIZE AND SCALING IN PRIMATE BIOLOGY. W.L. Jungers, ed. New York, Plenum Press, 1985.
48. Jungers, W.L. Aspects of size and scaling in primate biology with special reference to the locomotor skeleton. YEARBOOK OF PHYSICAL ANTHROPOLOGY 27:73-97, 1986.
49. Jungers, W.L.; Susman, R.L. Body size and skeletal allometry in African apes. Pp. 131-177 in THE PYGMY CHIMPANZEE. R.H. Susman, ed. New York, Plenum Press, 1984.
50. Kappeler, P.M.; Ganzhorn, J.U. The evolution of primate communities and societies in Madagascar. EVOLUTIONARY ANTHROPOLOGY 2:159-171, 1993.
51. Kay, R.F. The functional adaptations of primate molar teeth. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 43:195-216, 1975.
52. Kay, R.F. On the use of anatomical features to infer foraging behavior in extinct primates. Pp. 21-53 in ADAPTATIONS FOR FORAGING IN NONHUMAN PRIMATES. P.S. Rodman; J.G.H. Cant, eds. New York, Columbia University Press, 1984.
53. Kay, R.F., Hylander, W.L. The dental structure of mammalian folivores with special reference to Primates and Phalangeroidea (Marsupalia). Pp 173-191 in THE ECOLOGY OF ARBOREAL FOLIVORES. G.G. Montgomery, ed. Washington, D.C., Smithsonian, 1978.
54. Kleiber, M. THE FIRE OF LIFE. AN INTRODUCTION TO ANIMAL ENERGETICS. New York, Wiley Press, 1961.
55. Krogman, W.M. Studies in growth changes in the skull and face in anthropoids III: Growth changes in the skull and face of the gorilla. AMERICAN JOURNAL OF ANATOMY 47:89-115, 1931.
56. Leigh, S.R. Patterns of variation in the ontogeny of primate body size dimorphism. JOURNAL OF HUMAN EVOLUTION 23:27-50. 1992.
57. Leigh, S.R. Ontogenic correlates of diet in anthropoid primates. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLGY 94:499-522, 1994.
58. Leigh, S.R. Socioecology and the ontogeny of sexual size dimorphism in anthropoid primates. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 97:339-356, 1995.
59. Leigh, S.R.; Shea, B.T. Ontogeny and the evolution of adult body size dimorphism in apes. AMERICAN JOURNAL OF PRIMATOLOGY 36:37-60, 1995.
60. Leigh, S.R.; Shea, B.T. Size and ontogeny in African apes. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 99:43-65, 1996.
61. Leutenegger, W.; Cheverud, J.M. Correlates of sexual dimorphism in primates: Ecological and size variables. INTERNATIONAL JOURNAL OF PRIMATOLOGY 3:387-402, 1982.
62. Leutenegger, W.; Cheverud, J.M. Sexual dimorphism in primates: The effects of size. Pp. 33-50 in SIZE AND SCALING IN PRIMATE BIOLOGY. W.L. Jungers, ed. New York, Plenum Press, 1985.
63. Leutenegger, W.; Kelly, J.T. Relationship of sexual dimorphism in canine size and body size to social, behavioral, and ecological correlates in anthropoid primates. PRIMATES 18:117-136, 1977.
64. Malenky, R.K.; Wrangham, R.W. A quantitative comparison of terrestrial herbaceous food consumption by Pan paniscus in the Lomako Forest, Zaire and Pan troglodytes in the Kibale Forest, Uganda. AMERICAN JOURNAL OF PRIMATOLOGY 32:1-12, 1994.
65. Nishida, T.; Hiraiwa-Hasegawa, M. Chimpanzees and bonobos: Cooperative relationships among males. Pp. 165-177 in PRIMATE SOCIETIES. B.B. Smuts; D.L. Cheney; R.M. Seyfarth; R.W. Wrangham; T.T. Struhsaker, eds. Chicago, University of Chicago Press, 1987.
66. Nishihara, T. A preliminary report on the feeding habits of western lowland gorillas (Gorilla gorilla gorilla) in the Ndoki forest, northern Congo. Pp. 225-240 in TOPICS IN PRIMATOLOGY: BEHAVIOR, ECOLOGY AND CONSERVATION. N. Itoigawa; Y. Sugiyama; G.P. Sackett; R.K.R. Thompson, eds. Tokyo, University of Tokyo Press, 1992.
67. Randall, F.E. The skeletal and dental development and variability of the gorilla. HUMAN BIOLOGY 15:236-254, 1943.
68. Ravosa, M.J. Functional assessment of sub-family variation in maxillomandibular morphology among Old World monkeys. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 82:199-212, 1990.
69. Ravosa, M.J.; Meyers, D.M.; Glander, K.E. Relative growth of the limbs and trunk in sifakas: Heterochronic, ecological and functional considerations. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 92:499-520, 1993.
70. Ravosa, M.J.; Ross, C.F. Craniodental allometry and heterochrony in two howler monkeys: Alouatta seniculus and A. palliata. AMERICAN JOURNAL OF PRIMATOLOGY 33:277-299, 1994.
71. Remis, M.J. FEEDING ECOLOGY AND POSITIONAL BEHAVIOR OF WESTERN GORILLAS (GORILLA GORILLA GORILLA) IN THE CENTRAL AFRICAN REPUBLIC. Ph.D. dissertation; Yale University, 1994.
72. Remis, M.J. Effects of body size and social context on the arboreal activities of lowland gorillas in the Central African Republic. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 97:413-434, 1995.
73. Rodman, P.S. Foraging and social systems of orangutans and chimpanzees. Pp. 134-160 in ADAPTATIONS FOR FORAGING IN NONHUMAN PRIMATES. P.S. Rodman; J.G.H. Cant, eds. New York, Columbia University Press, 1984.
74. Ruvolo, M. Molecular evolutionary processes and conflicting gene trees: The hominoid case. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 94:89-113, 1994.
75. Ruvolo, M.; Disotell, T.R.; Allard, M. W.; Brown, W.M.; Honeycutt, R. L. Resolution of the African hominoid trichotomy by use of a mitochondrial gene sequence. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES U.S.A. 88:1570-1574, 1991.
76. Sailer, L.D.; Gaulin, S.J.C.; Boster, J.S.; Kurland, J.A. Measuring the relationship between dietary quality and body size in primates. PRIMATES 26:14-27, 1985.
77. Schaller, G.B. THE MOUNTAIN GORILLA: ECOLOGY AND BEHAVIOR. Chicago, University of Chicago Press, 1963.
78. Schmidt-Nielsen, K. SCALING: WHY IS ANIMAL SIZE SO IMPORTANT? Cambridge, Cambridge University Press, 1984.
79. Schultz, A.H. Some distinguishing characteristics of the mountain gorilla. JOURNAL OF MAMMALOGY 15:51-61, 1934.
80. Shea, B.T. Relative growth of the limbs and trunk in the African apes. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 56:179-201, 1981.
81. Shea, B.T. Allometry and heterochrony in the African apes. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 62:275-289, 1983.
82. Shea, B.T. The ontogeny of sexual dimorphism in the African apes. AMERICAN JOURNAL OF PRIMATOLOGY 8:183-188, 1985a.
83. Shea, B.T. Bivariate and multivariate growth allometry: Statistical and biological considerations. JOURNAL OF ZOOLOGY, LONDON (A) 206:367-390, 1985b.
84. Shea, B.T. Ontogenetic allometry and scaling, a discussion based on the growth and form of the skull in African apes. Pp. 175-205 in SIZE AND SCALING IN PRIMATE BIOLOGY. W.L. Jungers, ed. New York, Plenum Press, 1985c.
85. Shea, B.T. Scapula form and locomotion in chimpanzee evolution. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 70:475-488, 1986.
86. Shea, B.T. Ontogenetic scaling of skeletal proportions in the talapoin monkey. Pp. 283-307 in ONTOGENETIC PERSPECTIVES ON PRIMATE EVOLUTIONARY BIOLOGY. M.J. Ravosa; A.M. Gomez, eds. San Diego, Academic Press, 1992.
87. Smith, A.R.; Butler, T.M.; Pace, N. Weight growth of colony-reared chimpanzees. FOLIA PRIMATOLOGICA 24:29-59, 1975.
88. Sokal, R.R.; Rohlf, F.J. BIOMETRY, 3rd ed. San Francisco, Freeman, 1995.
89. Stearns, S.C. THE EVOLUTION OF LIFE HISTORIES. Oxford, Oxford University Press, 1992.
90. Steudel, K. New estimates of early hominid body size. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 52:63-70, 1980.
91. Steudel, K. Body size estimators in primate skeletal material. INTERNATIONAL JOURNAL OF PRIMATOLOGY 2:81-90, 1981.
92. Tanner, J.M. Some notes on the reporting of growth data. HUMAN BIOLOGY 23:93-159, 1951.
93. Taylor, A.B. A MORPHOMETRIC STUDY OF THE SCAPULA IN GORILLA (GORILLA GORILLA GORILLA and GORILLA GORILLA BERINGEI). Ph.D. dissertation; University of Pittsburgh, 1992.
94. Taylor, A.B. Effects of ontogeny and sexual dimorphism on scapula morphology in the mountain gorilla (Gorilla gorilla beringei). AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 98:431-445, 1995.
95. Taylor, A.B. Scapula form and biomechanics in gorillas. JOURNAL OF HUMAN EVOLUTION (in press).
96. Tutin, C.E.G. Ranging and social structure of lowland gorillas in the Lope Reserve, Gabon. Pp. 58-70 in GREAT APE SOCIETIES. W.C. McGrew; L.F. Marchant; T. Nishida, eds. Cambridge, Cambridge University Press, 1996.
97. Tutin, C.E.G.; Fernandez, M. Nationwide census of gorilla (Gorilla g. gorilla) and chimpanzee (Pan t. troglodytes) populations in Gabon. AMERICAN JOURNAL OF PRIMATOLOGY 6:313-336, 1984.
98. Tutin, C.E.G.; Fernandez, M. Foods consumed by sympatric populations of Gorilla g. gorilla and Pan t. troglodytes in Gabon: Some preliminary data. INTERNATIONAL JOURNAL OF PRIMATOLOGY 6:27-43, 1985.
99. Tutin, C.E.G.; Fernandez, M. Insect-eating by sympatric lowland gorillas (Gorilla gorilla gorilla) and chimpanzees (Pan t. troglodytes) in the Lope Reserve, Gabon. AMERICAN JOURNAL OF PRIMATOLOGY 28:29-40, 1992.
100. Tutin, C.E.G.; Fernandez, M. Composition of the diet of chimpanzees and comparisons with that of sympatric lowland gorillas in the Lope Reserve, Gabon. AMERICAN JOURNAL OF PRIMATOLOGY 30:195-211, 1993.
101. Tutin, C.E.G.; Fernandez, M.; Rogers, M.E.; Williamson, E.A.; McGrew, N.L. Foraging profiles of sympatric lowland gorillas and chimpanzees in the Lope Reserve, Gabon. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON B 334:179-186, 1991.
102. Tuttle, R.H.; Watts, D.P. The positional behavior and adaptive complexes of Pan gorilla. Pp. 261-288 in PRIMATE MORPHOPHYSIOLOGY, LOCOMOTOR ANALYSES AND HUMAN BIPEDALISM. S. Kondo, ed. Tokyo, University of Tokyo Press, 1985.
103. Uchida, A. INTRA-SPECIES VARIATION AMONG THE GREAT APES: IMPLICATIONS FOR TAXONOMY OF FOSSIL HOMINOIDS (PAN PANISCUS, GORILLA GORILLA, PAN TROGLODYTES, MIOCENE). Ph.D. dissertation, Harvard University, 1992.
104. Uchida, A. Intra-species variation in dental morphology of the great apes: A comparative study. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY SUPPLEMENT 16:198-199, 1993.
105. Uchida, A. Intra-species variation in tooth cusp areas of great apes: Implications for fossil hominoid taxonomy. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY SUPPLEMENT 18:199, 1994.
106. Vedder, A.L. Movement patterns of a group of free-ranging mountain gorillas (Gorilla gorilla beringei) and their relation to food availability. AMERICAN JOURNAL OF PRIMATOLOGY 7:73-89, 1984.
107. Watts, D.P. Composition and variability of mountain gorilla diets in the central Virungas. AMERICAN JOURNAL OF PRIMATOLOGY 7:323-356, 1984.
108. Watts, D.P. Strategies of habitat use by mountain gorillas. FOLIA PRIMATOLOGICA 56:1-16, 1991.
109. Watts, E.S.; Gavan, J.A. Postnatal growth of nonhuman primates: The problem of the adolescent spurt. HUMAN BIOLOGY 54:53-70, 1982.
110. Wilkinson, L. SYSTAT 6.0 For Windows. Chicago, SPSS, 1996.
111. Williamson, E.A.; Tutin, C.E.G.; Fernandez, M.; Rogers, M.E. Consumption of fruit by western lowland gorillas in Gabon. INTERNATIONAL JOURNAL OF PRIMATOLOGY 8:495, 1988.
112. Williamson, E.A.; Tutin, C.E.G.; Rogers, M.E.; Fernandez, M. Composition of the diet of lowland gorillas at Lope Gabon. AMERICAN JOURNAL OF PRIMATOLOGY 21:265-277, 1990.
113. Wrangham, R.W. Ecology and social relationships in two species of chimpanzee. Pp. 354-378 in ECOLOGICAL ASPECTS OF SOCIAL EVOLUTION. D.I. Rubenstein; R.W. Wrangham, eds. Princeton, Princeton University Press, 1986.
114. Wrangham, R.W.; Smuts, B.B. Sex differences in the behavioural ecology of chimpanzees in the Gombe National Park, Tanzania. JOURNAL OF REPRODUCTION AND FERTILITY SUPPLEMENT 28:13-31, 1980.
115. Yamagiwa, J.; Mwanza, N.; Yumoto, T.; Marahashi, T. Seasonal change in the composition of the diet of eastern lowland gorillas. PRIMATES 35:1-14, 1994.