COPA

Digital Repository for Área de Conservación Guanacaste, a World Heritage Place.

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Publicaciones Científicas: Recent submissions

  • AN ABANDONED FIELD IS NOT A TREE FALL GAP 
    Janzen, Daniel H. (1990)
  • AMMONIA UTILIZATION BY THE BRUCHID BEETLE, Caryedes brasiliensis [BRUCHIDAE] 
    Rosenthal, Gerald A.; Janzen, Daniel H. (1984-08-22)
  • Additional Land at What Price? -Responsible Use of the Tropics in a Food-Population Confrontation 
    Janzen, Daniel H. (1977)
    Department of Ecology and Evolutionary Biology, Division of Biology, University of Michigan, Ann Arbor 48104. Present address: Department of Biology, University of Pennsylvania, Philadelphia, PA 19174. This study was ...
  • THE QUARTERLY REVIEW OF BIOLOGY 2 
    Janzen, Daniel H. (1977-06)
    inflammability limits (4-75% in air), and is difficult (sometimes dangerous) to store as a liquid. Its principal benefits are that it would allow the storage of energy in a post-fossil-fuel era, when electricity is ...
  • Biological Pest Control 
    Janzen, Daniel H. (1977-04)
    Beginning in about 1965, the IBP psychologically and financially supported variously coordinated studies of the basic biology of five major widespread arthropod pests: fruit flies (Tephritidae), Myzus persicae, rice ...
  • Additional Land at What Price? -Responsible Use of the Tropics in a Food-Population Confrontation 
    Janzen, Daniel H. (1976)
    Department of Ecology and Evolutionary Biology, Division of Biology, University of Michigan, Ann Arbor 48104. Present address: Department of Biology, University of Pennsylvania, Philadelphia, PA 19174. This study was ...
  • AN ABANDONED FIELD IS NOT A TREE FALL GAP 
    Janzen, Daniel H. (1990)
  • CO 2 Reduction and Reforestation 
    Woodwell, G. M.; Janzen, Daniel H.; Wilcox, Howard A.; North, Wheeler J.; Swartz, James; Hoyer, Horst (1988-12-16)
    I would like to correct the misimpression given by Barry J. Cipra's Research News article (21 Oct., p. 374) that the accomplishment of Lenstra, Manasse, and others in factoring a 100-digit number somehow threatens the ...
  • Guanacaste National Park Project 
    Janzen, Daniel H. (1991)
    The greatest challenge facing the tropical biodiversity community is to stop intellectualizing and start doing. We now know how to conserve tropical biodiversity, and there are viable and growing conservation projects ...
  • The Evolutionary Ecology of Ant·Plant Mutualims 
    Janzen, Daniel H.; Beattle, Andrew J. (1985)
  • Editorial 
    Janzen, Daniel H. (1987-08)
    The professional conservation community is fighting a brave battle in the tropics, but it is losing. And it will continue to lose, and thus everyone will lose, unless there is a dramatic change in the number of participants ...
  • Conservation and Agricultural Economics 
    Janzen, Daniel H. (1987-06-05)
    Where the soil is fertile and the climate good, almost all tropical forest has been lost. However, fertile soil and good climate are not intrinsic traits. Those descriptors mean that a plant or animal of use to humans ...
  • Revolutionary zeal 
    Janzen, Daniel H. (1987-03-12)
    MICHAEL Crawley set out to put together a plant ecology text for the undergraduate, a text that would haul itself out of the musty bog of old world descriptive and aggregate plant ecology and into the chaos of new ...
  • This Week's Citation Classic 
    Janzen, Daniel H. (1981-11-21)
    An interpretive ecledic review of the widesprelld lind diffuse liter.llture on the om; nipresent phenomenon of lInimals preying on seeds, this paper focuses on the dif· ferences between pre- lind post-ciisperllll seed ...
  • Too-Using by the African Grey Parrot (Psittacus erithacus) 
    Janzen, Daniel H.; M. Pond, Caroline (1976-03)
    Our pet African grey parrot (origin: Cameroon), living in a free-flight wood and screen indoor cage (3 x 2 x 1 m), uses 1.5-4cm long splinters of wood to scratch the skin on the posterior part of its head.
  • TWO COSTA RICAN BAT-GENERATED SEED SHADOWS OF ANDIRA INERMIS (LEGUMINOSAE) 
    Janzen, Daniel H.; Miller, G. A.; Hackforth-Jones, J.; Pond, C. M.; Hooper, K.; Janos, D. P. (1976)
    Bat-generated seed shadows of two mature Andira inermis (W. Wright) DC. trees in the deciduous forest lowlands of Guanacaste Province, Costa Rica, are highly heterogeneous; very unequal numbers of seeds are deposited ...
  • FOOD AND FEEDING BEHAVIOR OF A CAPTIVE COSTA RICAN LEAST PIGMY OWL GLAUCIDIUM MINUTISSIMUM RARUM GRISCOM. (AVES: STRIGIDAE) 
    Janzen, Daniel H.; M. Pond, Caroline (1974)
    A captive nearly mature least pigmy owl Glaucidium minutissimum rarum Griscom from Limon Province was found to eat a very wide variety of animals and animal parts. When capturing prey or taking food she always closed ...
  • Effect of Defoliation on Fruit-bearing Branches of the Kentucky Coffee Tree, Gymnocladus dioicus (Leguminosae) 
    Janzen, Daniel H. (1976)
    By artificially defoliating fruit-bearing branches of a Kentucky Coffee Bean tree (Gymnocladus dioicus), it was shown that seed weight and secondary compound chemistry are not well buffered against foliage damage, a ...
  • Tropical Ecology 
    B. Golley, Frank; Medina, Ernesto; Janzen, Daniel H. (1975-09)
    This symposium volume reads like the first 25 papers dealing with the tropics to be found in a miscellaneous collection of standard and substandard journals of ecology! limnology!evolution. Tropical ecology has for long ...
  • Natural Resources of Humid Tropical Asia. Natural Resources Research, Volume XII. 
    Janzen, Daniel H. (1975-12)
    Fire on the western forests of the United States is also very good, but contains but four short paragraphs on Alaskan forests. The chapter on forest and savanna ecosystems of Sub-Saharan Africa covers too large an area ...

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