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The Scientific Bases for the Preservation of the Hawaiian Crow (1992) / Chapter Skim
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APPENDIX A
Pages 131-133

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From page 131...
... Models of extinction assume that a population ceiling (perhaps imposed by limited suitable habitat) , rather than the average population size, sets times to extinction.
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From page 132...
... Breeding Pairs 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1 1 3 4 2 3 5 6 7 2 3 1 1 2 1 2 3 5 2 0 0 0 0 1 2 2 3 0 1 2 2 1 0 0 0 1 0 0 0 ~ The means have not been calculated for several reasons: Theory suggests and experience confirms that times to extinction are likely to have a highly skewed distnbudon. It makes little sense to report that populations with maximums of n breeding pairs have a mean time to extinction of, for example, 20 years, when 90% of the populations are extinct in less than 5 years and ~ % last for cent urges.
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From page 133...
... Line shows median values for each value of observed maximum population size; thus 50% of populations that do not exceM Tree pairs become extinct in ~ years. Squares, complete records are available (from first invasion to extinction)
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Key Terms

  • breeding pairs
  • population size
  • complete records
  • fiftieth percentile
  • theory suggests

  • observed maximums
  • population lasted
  • territorial size
  • steep holm
  • skolt head

  • encounter populations
  • observed maximum
  • minimum estimates
  • little sense
  • farne islands

  • maximum population
  • managing species
  • extinction assume
  • habitat fragmentation
  • average population

  • median time
  • models measure
  • maximum density
  • islands included
  • population sizes

  • typically involve
  • fair isle
  • maximum size
  • suitable habitat
  • population maximums


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