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The Scientific Bases for Preservation of the Mariana Crow (1997) / Chapter Skim
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4 Major Findings and Criteria for Recovery of the AGA
Pages 53-58

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From page 53...
... personnel. Based upon the information detailed in the preceding chapters, this chapter summarizes the committee's major findings on the current state of knowledge of the aga's plight, and enumerates the basic criteria for prioritizing our recommended recovery actions.
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From page 54...
... Although the brown tree snake has not been found on Rota in natural habitats, individual brown tree snakes have been found on at least 10 other islands, including Oahu in Hawaii, the US mainland, and elsewhere; a population might already be established on Saipan. With many forested areas on Guam still having densities of over 30 snakes/ha and the urgent need to prevent snakes from being carried in air or ship cargo to other islands, control of the brown tree snake must be given the highest priority.
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From page 55...
... Aga eggs or chicks in unprotected nests were almost always eaten by snakes or lost to other causes. Efforts by DAWR to install electric barriers around nest trees and to isolate nest trees from the adjacent canopy has increased clutch sizes and reduced losses of nestlings to brown tree snake predation, but have not increased the number of fledglings.
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From page 56...
... Habitat protection on Guam consists of about 1,600 forested hectares owned and managed by the government of Guam and 9,000 forested hectares recently incorporated into the Guam National Wildlife Refuge, mostly on Andersen Air Force Base. On Rota, most of the land is privately owned, and pressure for economic development is increasing.
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From page 57...
... CRITERIA FOR PRIORITIZING AGA RECOVERY ACTIONS In this section, the committee outlines its criteria for recovery of the aga. These criteria were used by the committee in evaluating the potential management options enumerated in chapter 5 and in formulating the specific recommendations contained in chapter 6.
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From page 58...
... Endangered species recovery programs can promote the conservation of many species simultaneously if they are based on restoration of ecosystems. Because the brown tree snake has disrupted the entire forest ecosystem of Guam, its control in aga habitat could benefit other vertebrates.
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Key Terms

  • tree snake
  • nest trees
  • tree snakes
  • guam population
  • recovery actions

  • captive breeding
  • primary cause
  • snake predation
  • force base
  • recovery programs

  • endangered species
  • electric barriers
  • rota population
  • forested hectares
  • andersen air

  • recovery program
  • demographic goals
  • forest habitat
  • probably support
  • comprehensive recovery

  • reduced losses
  • genetic considerations
  • additional forest
  • major findings
  • potential management

  • neither intensive
  • mainland zoo
  • captive propagation
  • rarely results
  • guam consists


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