A unit of Lasting Forests
Sustained forests; sustained profits
evolving since March 30, 1999

of an Alternative Wildlife Resource Management

Population Review

1. Populations have structure. This includes:
   • abundance (density, richness, etc.)
   • age ratios
   • sex ratios
   • genetic groups (demes)
2. Aging animals is important to determine trends and dynamics.
3. Use 3 categories:
   • young,
   • subadult,
   • adult.
4. When there are a few animals in old age-classes, confidence is difficult to establish.
5. Use age classes to depict a survival curve.
6. Use age classes to depict a mortality curve.
7. Numbers in age classes are often distributed as the "reversed-J", the negative logarithm.
8. Young : old ratio is useful with sex ratios.
9. Calf : cow ratio is useful in understanding production.
10. Population analysis includes analyzing
    • structure,
    • dynamics, and
    • relations.
11. Population dynamics is a study of the rates of change in populations. The study categories are:
    • natality
    • mortality
    • survival
    • migration
    • innate
12. Population relations are:
    • competition (negative symbiosis)
    • predation
    • territoriality (area defense)
13. Controversy: population "regulation" by itself or by other factors?
14. Yield is a mortality-factor topic. Resource management is directed (at least) at the product of number of animals and net benefits from the population.

An outline for population ecology is available.

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Last revision July 20, 2000.