No Park Is an Island: Increase in Interference from Outside as Park Size Decreases

  • Daniel H. Janzen

Abstract

There is evident conservation value to numerous small habitat preserves (parks) when large protected areas are impractical (Simberloff 1982). However, such a management policy brings to mind a caution that is often unappreciated for parks and other forms of conserved pristine vegetation, and becomes ever more appropriate as park size decreases. The smaller the patch (island) of habitat that is viewed as pristine, the greater the effect of the surrounding secondary successional vegetation and croplands as a source of 1) animals and seeds that enter the park and interact with the residents, and 2) food subsidy for residents capable of foraging outside of the pristine forest.

Keywords

Sugar Germinate Explosive Beach Expense 

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References

  1. Boucher, D. H. 1981. Seed predation by mammals and forest dominance by Quercus oleoides, a tropical lowland oak. — Oecologia (Berl.) 49: 409–414.CrossRefGoogle Scholar
  2. Boza, M. A. and Mendoza, R. 1981. The national parks of Costa Rica. — INCAFO, S.A., Madrid, Spain.Google Scholar
  3. Fleming, T. H. 1981. Fecundity, fruiting pattern, and seed dispersal in Piper amalago (Piperaceae), a bat-dispersed tropical shrub. — Oecologia (Berl.) 51:42–46.CrossRefGoogle Scholar
  4. Fleming, T. H. and Heithaus, E. R. 1981. Frugivorous bats, seed shadows, and the structure of tropical forests. — Biotropica (supplement) 13:45–53.Google Scholar
  5. Foster, M. S. 1976. Nesting biology of the long-tailed manakin. — Wilson Bull. 88:400–420.Google Scholar
  6. Holthuijzen, A. M. A. and Boerboom, J. H. A. 1982. The Cecropia seedbank in the Surinam lowland rain forest. — Biotropica 14:62–68.CrossRefGoogle Scholar
  7. Janzen, D. H. 1967. Interaction of the bull’s-horn acacia (Acacia cornigera L.) with an ant inhabitant (Pseudomyrmex ferruginea F. Smith) in eastern Mexico. — Univ. Kansas Sei. Bull. 47:315–558.Google Scholar
  8. Janzen, D. H. 1969. Allelopathy by myrmecophytes: the ant Azteca as an allelopathic agent of Cecropia. — Ecology 50:146–153.CrossRefGoogle Scholar
  9. Janzen, D. H. 1973. Dissolution of mutalism between Cecropia and Azteca ants. —Biotropica 5:15–28.CrossRefGoogle Scholar
  10. Janzen, D. H. 1978. Seeding patterns of tropical trees. —In: Tomlinson, P. B. and Zimmerman, M. H. (eds), Tropical trees as living systems. Cambridge Univ. Press, New York, pp. 83–128.Google Scholar
  11. Janzen, D. H. and Liesner, R. 1980. Annotated check-list of plants of lowland Guanacaste Province, Costa Rica, exclusive of grasses and non-vascular cryptograms. — Brenesia 18:15–90.Google Scholar
  12. Janzen, D. H. and Martin, P.S. 1982. Neotropical anachronisms: the fruits the gomphotheres ate. — Science 215:19–27.PubMedCrossRefGoogle Scholar
  13. Keast, A. and Morton, E. S. (eds) 1980. Migrant birds in the Neotropics. — Smithsonian Inst. Press, Washington, D.C.Google Scholar
  14. Simberloff, D. 1982. Big advantages of small refuges. — Natural History 91(4):6–14.Google Scholar

Copyright information

© Oikos 1983

Authors and Affiliations

  • Daniel H. Janzen

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