Biology 30

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Across
  1. 2. representation of the age structure of a population to show the proportion of individuals in the population in each age class; used by demographics to assess a population’s potential for growth
  2. 4. a type of symbiotic relationship in which both partners benefit from the relationship, or depend on it in order to survive
  3. 10. pattern exhibited by a population which is increasing exponentially; results in a J-shaped curve showing a brief lag phase, followed by a steep increase in the growth curve
  4. 11. change in population size (N) over a specific time frame (t); N is equivalent to the number of births plus immigration minus the number of deaths plus emigration; formula gr=N/t
  5. 14. biotic factor that limits a habitat’s carrying capacity (e.g. parasites, disease); impact increases with the density of the population
  6. 15. highest possible per capita growth rate for a population, given unlimited resources and ideal living conditions
  7. 16. first species to colonize a barren or disturbed habitat and initiate primary
Down
  1. 1. abiotic factor that limits a habitat’s carrying capacity (e.g. fire, floods); the impact is not affected by the density of the population
  2. 3. population increase that results in an S-shaped curve; growth is slow at first, steepens in an exponential pattern, and then levels off due to environmental resistance such as competition
  3. 5. the regrowth of a previously existing community after an ecological disturbance, such as a forest fire, flood, or agricultural activity; differs from primary succession in the presence of soil, which is not usually destroyed in an ecological disturbance
  4. 6. adaptation that helps individuals avoid predation; includes camouflage, mimicry, and using body colours as a warning sign
  5. 7. a life strategy designed to take advantage of stable environmental conditions; characterized by the production of a few offspring with much attention given to offspring survival; organisms that exhibit this strategy include mammals and species that live close to the carrying capacity of their habitats
  6. 8. the number of individual organisms (N) in a given area (A) or volume (V); formula Dp=N/A or Dp=N/V
  7. 9. a type of symbiotic relationship in which on individual lives close to or on another and benefits, and the host neither benefits, nor is harmed
  8. 12. direct or close relationship between individuals of different species that live together; usually involves an organism that loves or feeds in or on another organism (host)
  9. 13. a type of symbiotic relationship in which an organism benefits by living on or in an organism of a different species that is harmed by the association