Behavioral Ecology and Sociobiology

, Volume 1, Issue 4, pp 337–381 | Cite as

Social organization and foraging in emballonurid bats

I. Field Studies
  • J. W. Bradbury
  • S. L. Vehrencamp
Article

Summary

  1. 1.

    Five species of emballonurid bats (Rhynchonycteris naso, Saccopteryx leptura, Balantiopteryx plicata, Saccopteryx bilineata, and Peropteryx kappleri), were studied in Costa Rica and Trinidad. Stomach contents suggest that prey size generally increases for bat body size, but within these species there is considerable overlap. R. naso, S. leptura, and P. kappleri each appear to be specialized for foraging in a particular habitat type; B. plicata and S. bilineata are more opportunistic and feed over a variety of habitats during the year. While the other species feed in the proximity of surfaces, B. plicata is further separated from the other species by wing specializations favoring high altitude flight.

     
  2. 2.

    Foraging dispersion is more closely related to body size than it is to social structure at the roost: small bats group-forage while larger bats feed in solitary beats. In all of the species, food is spatially and temporally variable, and the location of foraging sites changes seasonally in accordance with these locally varying patterns of aerial insect abundance. In the case of S. bilineata, the locations of foraging sites were positively correlated with levels of phenological activity in the underlying plant communities.

     
  3. 3.

    Colony sizes ranged from small groups of 2–10 bats (S. leptura, P. kappleri), to intermediate colonies of 5–50 bats (R. naso, S. bilineata), to very large colonies with hundreds of bats (B. plicata).

     
  4. 4.

    R. naso, S. leptura, and S. bilineata colonies have colony-specific annual foraging ranges which are actively defended against conspecifics from other colonies. In most cases, all members of a given colony of one of these species will be found foraging in a common site at any time. In R. naso and S. bilineata, currently used foraging sites are partitioned socially. In the former species, adult breeding females occupy a central area and groupforage while younger non-breeding females and males occupy peripheral foraging areas in the colony territory. In S. bilineata, the colony foraging site is partitioned into individual harem territories defended by harem males and containing the individual beats of all current harem females. For this latter species, details of roost site subdivision are mapped directly onto foraging dispersions. In general, there is a close correlation between dayroost group membership and location of nocturnal foraging sites in all of the study species.

     

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References

  1. Altmann, S.A.: Baboons, space, time and energy. Amer. Zoologist 14, 221–259 (1974)Google Scholar
  2. Black, H.L.: A north temperate bat community: Structure and prey populations. J. Mammal. 55, 138–157 (1974)Google Scholar
  3. Bradbury, J.: Social organization and communication. In: The biology of bats, Vol. III (ed. W. Wimsatt). New York: Academic Press in pressGoogle Scholar
  4. Bradbury, J., Emmons, L.: Social organization of some Trinidad bats. I. Emballonuridae. Z. Tierpsychol. 36, 137–183 (1974)Google Scholar
  5. Crook, J.H.: The evolution of social organization and visual communication in the weaver birds (Ploceinae). Behaviour, Suppl. 10, 1–178 (1964)Google Scholar
  6. Downs, W.G., Aitken, T.H.G., Worth, C.B., Spence, L., Jonkers, A.H.: Arbovirus studies Bush Bush Forest, Trinidad, W.I., Sept. 1959–Dec. 1964. I. Description of the study area. Amer. J. trop. Med. Hyg. 17, 224–236 (1968)Google Scholar
  7. Eberhardt, L.L.: Population analysis. In: Willife management techniques. 3rd ed. (ed. R.H. Giles). Washington, D.C.: The Wildlife Society, Inc. 1971Google Scholar
  8. Eisenberg, J.F., Muckenhirn, N.A., Rudran, R.: The relation between ecology and social structure in primates. Science 176, 863–874 (1972)Google Scholar
  9. Findley, J.S., Studier, E.H., Wilson, D.E.: Morphologic properties of bat wings. J. Mammal. 53, 429–444 (1972)Google Scholar
  10. Frankie, G.W., Baker, H.G., Opler, P.A.: Comparative phenological studies of trees in tropical wet and dry forests in the lowlands of Costa Rica. J. Ecol. 62, 881–919 (1974)Google Scholar
  11. Glander, K.E.: Habitat and resource utilization in mantled howling monkeys. PhD thesis, Univ. Chicago. Chicago, Illinois 1975Google Scholar
  12. Griffin, D.R., Novick, A.: Acoustic orientation of neotropical bats. J. exp. Zool. 130, 251–300 (1955)Google Scholar
  13. Hollander, M., Wolfe, D.A.: Nonparametric statistical methods. New York: John Wiley and Sons, 1973Google Scholar
  14. Hutchinson, G.E.: Homage to Santa Rosalia, or why are there so many kinds of animals? Amer. Naturalist 93, 145–159 (1959)Google Scholar
  15. Janzen, D.H.: Sweep samples of tropical foliage insects: effects of seasons, vegetation types, elevation, time of day and insularity. Ecology 54, 687–708 (1973)Google Scholar
  16. Jarman, P.J.: The social organization of antelope in relation to their ecology. Behaviour 48, 215–267 (1974)Google Scholar
  17. Lopez-Forment, W.: Some ecological aspects of the bat Balantiopteryx plicata plicata, Peters, 1867 (Chiroptera: Emballonuridae) in Mexico. M.S. thesis, Cornell Univ., Ithaca, New York 1976Google Scholar
  18. McCue, J.J.G., Bertolini, A.: A protable receiver for ultrasonic waves in the air. I.E.E. Trans. Sonics Ultrason. SU 11, 41–49 (1964)Google Scholar
  19. Odum, E.P., Kuenzler, E.J.: Measurement of territory and home range size in birds. Auk 72, 128–137 (1955)Google Scholar
  20. Pitelka, F.A., Holmes, R.T., MacLean, S.F.: Ecology and evolution of social organization in Arctic Sandpipers. Amer. Zoologist 14, 185–204 (1974)Google Scholar
  21. Pye, J.D.: Echolocation by constant frequency in bats. Period. Biol. 75, 21–26 (1973)Google Scholar
  22. Schoener, T.W.: Models of optimal size for solitary predators. Amer. Naturalist 103, 277–313 (1969)Google Scholar
  23. Schoener, T.W.: Resource partitioning in ecological communities. Science 185, 27–39 (1974)Google Scholar
  24. Schoener, T.W., Janzen, D.H.: Notes on environmental determinants of tropical versus temperate insect size patterns. Amer. Naturalist 102, 207–224 (1968)Google Scholar
  25. Sokal, R.R., Rohlf, F.J.: Biometry. San Francisco: W.H. Freeman and Co. 1969Google Scholar
  26. Tannenbaum, B.R.: Reproductive strategies in the white-lined bat. PhD thesis, Cornell Univ., Ithaca, New York 1975Google Scholar
  27. Vehrencamp, S.: The evolution of communal nesting in groove-billed anis. PhD thesis, Cornell Univ., Ithaca, New York 1976Google Scholar

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • J. W. Bradbury
    • 1
  • S. L. Vehrencamp
    • 1
  1. 1.Department of BiologyUniversity of California at San DiegoLa JollaUSA

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