Chapter 9 AP Environmental

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Across
  1. 5. Occurs when so few members of species are left that it can no longer play its ecological roles in the biological communities where it is found
  2. 7. The value that individuals may attach to the mere knowledge of the existence of something, as opposed to having direct use of that thing
  3. 10. respond quickly to environmental changes in their habitat
  4. 12. Treaty that bans hunting, capturing, and selling of threatened or endangered species
  5. 16. An increase in the concentration of a chemical in specific organs or tissues at a level higher than would normally be accepted
  6. 17. Wild species that is still abundant in its natural range but is likely to become endangered because of a decline in numbers
  7. 19. Acronym used by conservation biologist for the six most important secondary causes of premature extinction
  8. 20. Value of an oranism, species, ecosystem, or the earth's biodiversity based on its usefulness to humans
Down
  1. 1. Percentage or number of species that go extinct within an certain time such as a year
  2. 2. The extinction of many species in a relatively short period of geological time
  3. 3. Occurs when a large contiguous area of habitat is reduced in area and divided into smaller, more scattered, and isolated patches, or habitat islands
  4. 4. Normal extinction of various species as a result of changes in local environmental conditions
  5. 6. Increase in concentration of slowly degradable, fatsable chemicals in organisms at successively higher trophic levels of a food chain or web
  6. 8. When there is significant scientific uncertainty about potentially serious harm from chemicals or tecnologies, decision makers should act to prevent harm to humans and the environment
  7. 9. A species is no longer found anywhere on earth
  8. 11. A fear of many forms of wildlife
  9. 13. Value of an organism, species, ecosystem, or the earth's biodiversity based on its existence, regardless of whether it has any usefulness to humans
  10. 14. Occurs when a species is no longer found in an area it once inhabited but is still found elsewhere in the world
  11. 15. Wild species with so few individual survivors that the species could soon become extinct in all or most of its natural range
  12. 18. Concentrated areas where many of the country's rarest and most imperiled species are