Across
- 3. 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
- 6. adaptation that helps individuals avoid predation; includes camouflage, mimicry, and using body colours as a warning sign
- 8. 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
- 10. theoretical maximum population size that the environment can sustain over an extended period of time; may change over time as the habitat changes
- 12. abiotic factor that limits a habitat’s carrying capacity (e.g. fire, floods); the impact is not affected by the density of the population
- 14. combined effects of various interacting factors that limit population growth; prevents a population from growing at its biotic potential and determines the carrying capacity of the habitat
- 15. biotic factor that limits a habitat’s carrying capacity (e.g. parasites, disease); impact increases with the density of the population
- 17. the number of individual organisms (N) in a given area (A) or volume (V); formula Dp=N/A or Dp=N/V
- 18. 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
- 19. 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
Down
- 1. 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. first species to colonize a barren or disturbed habitat and initiate primary
- 4. 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)
- 5. 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
- 7. highest possible per capita growth rate for a population, given unlimited resources and ideal living conditions
- 9. 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
- 11. 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
- 13. a life strategy designed to take advantage of favourable conditions; characterized by a high reproductive rate with little or no attention given to offspring survival; organisms that exhibit this strategy include bacteria and species that reproduce close to their biotic potential
- 16. a type of symbiotic relationship in which both partners benefit from the relationship, or depend on it in order to survive