Population dynamics lecture three: density-dependence

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Across
  1. 1. group behaviours that can alter environmental conditions in a way that benefits the groups
  2. 6. environmental conditions restrict the growth, abundance, or distribution of a population within an ecosystem
  3. 8. a positive feedback mechanism that causes the per capita population growth rate to increase as population size increases
  4. 10. per capita growth rate is reduced at low population sizes
  5. 12. mate limitation, cooperative defence, cooperative feeding, environmental conditioning, predator satiation
  6. 14. population growth characterized by explosions and subsequent sharp population crashes or diebacks (boom-bust dynamics)
  7. 15. growth is depressed at high density
  8. 17. difficulty in finding compatible mates, which can reduce reproduction rates in species that reproduce sexually
  9. 18. describes irruptive growth
  10. 20. a state or set of states in an ecological system that is maintained over time, regardless of initial conditions
  11. 21. when a small change in a continuous parameter results in a change in the number of attractors
  12. 22. delays between environmental changes and observed effects on populations or ecosystems
  13. 23. factors that influence population growth rate (usually through birth and survival), whose effect depends on population density
  14. 24. group behaviours that provide protection against predators, which can increase survival rates
Down
  1. 2. group feeding behaviours that can improve the efficiency of food acquisition and reduce predation risk`
  2. 3. a density-dependent process that can halt population increase through negative feedback on population growth rate
  3. 4. non-linear relationship between population density and growth rate, where the growth rate does not decrease linearly with increasing density
  4. 5. how populations grow in environments with limited resources
  5. 7. a discrete time equivalent of the logistic growth model (appropriate for birth-pulse species that have distinct breeding seasons)
  6. 9. mechanisms that control or limit the growth of populations by effecting the birth and death rates (density-dependent and density-independent)
  7. 11. population growth is depressed at low density
  8. 13. the tendency of predators to become satiated and stop increasing consumption when prey population is large
  9. 16. not random, it is the result of deterministic mechanisms generating non-repeating patterns
  10. 19. a population system that exhibits a pattern of oscillation in which the population continues to grow and decline in a regular manner over time