Abstract
Considerable disagreement characterizes the debate concerning frequency, causation, and function of infanticide in connection with adult male replacements in bisexual one-male troops of hanuman langurs (Presbytis entellus). Detailed observations are presented about two noninfanticidal and three infanticidal male changes including six eye-witness and five presumed cases of infanticide within three langur troops during a long-term study at Jodhpur, Rajasthan, India. The results do not support any explanatory hypotheses focussing on social crowding, regulation of population density, social stress, sexual frustration, incest avoidance, or social bonding, but are in general though not total agreement with the reproductive advantage hypothesis: mainly unrelated infants were killed (one possible exception), the infanticidal male generally sired the subsequent offspring (one exception), and the mean interbirth interval subsequent to infanticide is by 2.1 months shortened. Likewise, several cases of stress induced abortions occurred. It is demonstrated that postconception estrous behaviour is by no means a female counterstrategy to infanticide in order to confuse males concerning the issue of paternity, since an infanticidal male did not spare the subsequent offspring of mothers who copulated with him during pregnancy and pregnant females did not discriminate between fathers and non-fathers.
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Agoramoorthy, G., 1986. Recent observations on 12 cases of infanticide in Hanuman langur,Presbytis entellus, around Jodhpur, India.Abstr. XIth Congr. Int. Primatol. Soc., July 20–25, 1986 at Göttingen,Prim. Rep., 14: 209–210.
Alcock, J., 1979.Animal Behavior: An Evolutionary Approach. Sinauer, Sunderland, Massachusetts.
Angst, W. &D. Thommen, 1977. New data and a discussion of infant-killing in Old World monkeys and apes.Folia Primatol., 27: 198–229.
Barash, D. P., 1980.Sociobiology and Behavior. Elsevier, New York.
Berger, J., 1983. Induced abortion and social factors in wild horses.Nature, 303: 59–61.
Bishop, N., 1975. Social behavior of langur monkeys (Presbytis entellus) in a high altitude environment. Ph.D. thesis, Univ. of California, Berkeley.
Boggess, J. E., 1976. Social behavior of the Himalayan langur (Presbytis entellus) in eastern Nepal. Ph.D. thesis, Univ. of California, Berkeley.
—, 1979. Troop male membership changes and infant killing in langurs (Presbytis entellus).Folia Primatol., 32: 65–107.
—, 1980. Intermale relations and troop male membership changes in langurs (Presbytis entellus) in Nepal.Int. J. Primatol., 1: 233–274.
—, 1984. Infant killing and male reproductive strategies in langurs (Presbytis entellus). In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 283–310.
Bruce, H. M., 1960. A block to pregnancy in the house mouse caused by the proximity of strange males.J. Reprod. Fertil., 1: 96–103.
Butynski, T. M., 1982. Harem-male replacement and infanticide in the blue monkey (Cercopithecus mitis stuhlmanni) in the Kibale forest, Uganda.Amer. J. Primatol., 3: 1–22.
Chalmers, N., 1986. Book Review:Infanticide: Comparative and Evolutionary Perspectives, edited byG. Hausfater & S. B. Hrdy.Int. J. Primatol., 7: 327–329.
Crockett, C. &R. Sekulic, 1984. Infanticide in red howler monkeys (Alouatta seniculus). In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 173–192.
Curtin, R. A., 1977. Langur social behavior and infant mortality.Kroeber Anthropol. Soc. Pap., 50: 27–36.
— &P. Dolhinow, 1978. Primate social behavior in a changing world.Amer. Scientist, 66: 468–475.
—, 1979. Infanticide among langurs—a solution to overcrowding?Science Today, 13: 35–41.
Eibl-Eibesfeldt, I., 1984.Die Biologie des menschlichen Verhaltens—Grundriβ der Humanethologie. Piper, München.
Fossey, D., 1984. Infanticide in mountain gorillas (Gorilla gorilla beringei) with comparative notes on chimpanzees. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 217–236.
Hausfater, G., 1984. Infanticide in langurs: strategies, counter-strategies, and parameter values. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 257–282.
—,S. Aref, &S. J. Cairns, 1982. Infanticide as an alternative male reproductive strategy in langurs: a mathematical model.J. Theor. Biol., 94: 391–412.
— &S. B. Hrdy (eds.), 1984.Infanticide: Comparative and Evolutionary Perspectives. Aldine, New York.
— &C. Vogel, 1982. Infanticide in langur monkeys (genusPresbytis): recent research and a review of hypotheses. In:Advanced Views in Primate Biology,A. B. Chiarelli &R. S. Corruccini (eds.), Springer, Heidelberg, pp. 160–176.
Hrdy, S. B., 1974. Male-male competition and infanticide among the langurs (Presbytis entellus) of Abu, Rajasthan.Folia Primatol., 22: 19–58.
—, 1977.The Langurs of Abu. Harvard Univ. Press, Cambridge, London.
—, 1979. Infanticide among animals: a review, classification and examination of the implications for the reproductive strategies of females.J. Ethol. Sociobiol., 1: 13–40.
—, 1982. Positivist thinking encounters field primatology, resulting in agonistic behavior.Soc. Sci. Inform., 21: 245–250.
Itani, J., 1972. A preliminary essay on the relationships between social organization and incest avoidance in nonhuman primates. In:Primate Socialization,F. E. Poirier (ed.), Random House, New York, pp. 165–171.
—, 1982. Intraspecific killing among non-human primates.J. Soc. Biol. Struct., 5: 361–368.
Jay, P., 1965. The common langur of north India. In:Primate Behavior—Field Studies on Monkeys and Apes,I. DeVore (ed.), Holt, Rinehart, & Winston, New York, pp. 197–249.
Labov, J. B., 1984. Infanticidal behavior in male and female rodents: Sectional introduction and directions for future research. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 323–330.
Laws, J. V. H. &J. Laws, 1984. Social interactions among adult male langurs (Presbytis entellus) at Rajaji Wildlife Sanctuary.Int. J. Primatol., 5: 31–50.
Leland, L., T. T. Struhsaker, &T. M. Butynski, 1984. Infanticide by adult males in three primate species of the Kibale Forest, Uganda: a test of hypotheses. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 151–172.
Makwana, S. C., 1979. Infanticide and social change in two groups of the hanuman langur,Presbytis entellus, at Jodhpur.Primates, 20: 293–300.
Maynard-Smith, J., 1974. The theory of games and the evolution of animal conflicts.J. Theor. Biol., 47: 209–221.
Mohnot, S. M., 1971. Some aspects of social changes and infant-killing in the Hanuman langur,Presbytis entellus (Primates: Cercopithecidae), in western India.Mammalia, 35: 175–198.
—,G. Agoramoorthy, &L. S. Rajpurohit, 1986. Male takeovers inducing abortions in Hanuman langur,Presbytis entellus. Abstr. XIth Congr. Int. Primatol. Soc., July 20–25, 1986 at Göttingen,Prim. Rep., 14: 208.
Moore, J., 1983. Where the boys are: Females in langur all-male-bands. Paper presented atAnn. Meet. Anim. Behav. Soc., Lewisburg, PA.
Muckenhirn, N. A., 1972. Leaf-eaters and their predators in Ceylon: ecological roles of gray langurs,Presbytis entellus, and leopards. Ph.D. thesis, Univ. of Maryland.
Newton, P. N., 1985. The behavioural ecology of forest hanuman langurs.Tigerpaper, XII (3): 3–7.
—, 1986. Infanticide in undisturbed forest population of hanuman langurs,Presbytis entellus.Anim. Behav., 34: 785–789.
Oppenheimer, J. R., 1977.Presbytis entellus: the Hanuman langur. In:Primate Conservation,HSH Prince Rainier III of Monaco &G. H. Bourne (eds.), Academic Press, New York, San Francisco & London, pp. 469–512.
Packer, C. &A. E. Pusey, 1984. Infanticide in carnivores. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 31–42.
Parthasarathy, M. D. & H. Rahaman, 1974. Infant-killing and dominance assertion among the Hanuman langur.Abstr. Vth Congr. Int. Primatol. Soc., August 21–24, 1974 at Nagoya, Japan, p. 35.
Pereira, M. E., 1983. Abortion following the immigration of an adult male baboon (Papio cynocephalus).Amer. J. Primatol., 4: 93–98.
Ramaswami, L. S., 1975. Some aspects of the reproductive biology of the langur monkeyPresbytis entellus entellus Dufresne.Proc. Indian Nat. Sci. Acad., B41: 1–30.
Rijksen, H. D., 1981. Infant killing, a possible consequence of a disputed leader role.Behaviour, 78: 138–167.
Ripley, S., 1967. Intertroop encounters among Ceylon gray langurs (Presbytis entellus) In:Social Communication among Primates,J. Altmann (ed.), Univ. of Chicago Press, Chicago.
—, 1979. Environmental grain, niche diversification, and positional behavior in neogene primates: an evolutionary hypothesis. In:Environment, Behavior, and Morphology; Dynamic Interactions in Primates,M. E. Morbeck,H. Preuschoft, &N. Gomberg (eds.), G. Fischer, New York, pp. 37–74.
—, 1980. Infanticide in langurs and man: Adaptive advantage or social pathology? In:Biosocial Mechanisms of Population Regulation,M. N. Cohen,R. S. Malpass, &H. G. Klein (eds.), Yale Univ. Press, New Haven & London, pp. 349–390.
Rudran, R., 1973. Adult male replacement in one-male troops of purple-faced langurs (Presbytis senex senex) and its effect on population structure.Folia Primatol., 19: 166–192.
—, 1979. The demography and social mobility of a red howler (Alouatta seniculus) population in Venezuela. In:Vertebrate Ecology in the Northern Neotropics,J. F. Eisenberg (ed.), Smithsonian Institution Press, Washington, D.C., pp. 107–126.
Schubert, G., 1982. Infanticide by usurper hanuman langur males: A sociobiological myth.Soc. Sci. Inf., 21: 199–244.
Sommer, V., 1985. Weibliche und männliche Reproduktionsstrategien der Hanuman-Languren (Presbytis entellus) von Jodhpur, Rajasthan/Indien. Ph.D. thesis, Univ. of Göttingen.
— &S. M. Mohnot, 1985. New observations on infanticides among hanuman langurs (Presbytis entellus) near Jodhpur (Rajasthan/India).Behav. Ecol. Sociobiol., 16: 245–248.
Struhsaker, T. T. &L. Leland, 1985. Infanticide in a patrilineal society of red colobus monkeys.Z. Tierpsychol., 69: 89–132.
Sugiyama, Y., 1965a. Behavioral development and social structure in two troops of Hanuman langurs (Presbytis entellus).Primates, 6: 213–247.
—, 1965b. On the social change of Hanuman langurs (Presbytis entellus) in their natural condition.Primates, 6: 381–418.
—, 1966. An artificial social change in a hanuman langur troop (Presbytis entellus).Primates, 7: 41–72.
—, 1984a. Proximate factors of infanticide among langurs at Dharwar: a reply toBoggess. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 311–314.
—, 1984b. Some aspects of infanticide and intermale competition among langurs,Presbytis entellus, at Dharwar, India.Primates, 25: 423–432.
— &M. D. Parthasarathy, 1979. Population change of the Hanuman langur (Presbytis entellus), 1961–1976, in Dharwar area, India,J. Bombay Nat. Hist. Soc., 75: 860–867.
—,K. Yoshiba, &M. D. Parthasarathy, 1965. Home range, mating season, male group and inter-troop relations in Hanuman langurs (Presbytis entellus).Primates, 6: 73–106.
Trivers, R., 1985.Social Evolution. Benjamin/Cummings, Menlo Park, California.
Vogel, C., 1973. Acoustical communication among free-ranging common Indian langurs (Presbytis entellus) in two different habitats of north India.Amer. J. Phys. Anthropol., 38: 469–480.
----, 1976.Ökologie, Lebensweise und Sozialverhalten der grauen Languren in verschiedenen Biotopen Indiens. Fortschr. Verhaltensforschung, Beihefte Zeitschr. Tierpsychol., 17, Paul Parey, Berlin.
—, 1977. Ecology and sociology ofPresbytis entellus. In:Use of Non-human Primates in Biomedical Research,M. R. D. Prasad &T. C. Anand Kumar (eds.), Indian Nat. Sci. Acad., New Delhi, pp. 24–45.
—, 1979. Der Hanuman Langur (Presbytis entellus), ein Parade-Exempel für die theoretischen Konzepte der Soziobiologie? In:Verhandl. Dt. Zool. Gesellsch.,W. Rathmayer (ed.), G. Fischer, Stuttgart, pp. 73–89.
— &H. Loch, 1984. Reproductive parameters, adult male replacements, and infanticide among free ranging langurs (Presbytis entellus) at Jodhpur (Rajasthan), India. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 237–255.
vom Saal, F. S., 1984. Proximate and ultimate causes of infanticide and parental behavior in male house mice. In:Infanticide: Comparative and Evolutionary Perspectives,G. Hausfater &S. B. Hrdy (eds.), Aldine, New York, pp. 401–425.
Wickler, W. &U. Seibt, 1977.Das Prinzip Eigennutz—Ursachen und Konsequenzen sozialen Verhaltens. Hoffmann & Campe, Hamburg.
Winkler, P., 1981. Zur Öko-Ethologie freilebender Hanuman-Languren (Presbytis entellus entellus Dufresne, 1797) in Jodhpur (Rajasthan), India. Ph.D. thesis, Univ. of Göttingen.
—,H. Loch, &C. Vogel, 1984. Life history of Hanuman langurs (Presbytis entellus). Reproductive parameters, infant mortality, and troop development.Folia Primatol., 43: 1–23.
Yoshiba, K., 1968. Local and intertroop variability in ecology and social behavior of common Indian langurs. In:Primates,P. C. Jay (ed.), Holt, Rinehart, & Winston, New York, pp. 217–242.
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Sommer, V. Infanticide among free-ranging langurs (Presbytis entellus) at jodhpur (Rajasthan/India): Recent observations and a reconsideration of hypotheses. Primates 28, 163–197 (1987). https://doi.org/10.1007/BF02382569
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DOI: https://doi.org/10.1007/BF02382569