Across
- 4. measure of individuals living in a defined are
- 6. movement of individuals into a population
- 8. environmental resistance that affects a population regardless of population density
- 9. dramatic decline in the size of a population over a short period of time
- 12. reestablishment of a damaged ecosystem in an are where the soil was left intact
- 14. establishment and development of an ecosystem in an area that was previously uninhabited.
- 16. theory that states that no two species can occupy the same niche at the same time
- 17. environmental resistance that affects a population that becomes overly crowded
- 18. number of individuals that the resources of an environment can normally and persistently support
- 19. way in which individuals of a population are spread out over an area or volume survivorshipcurve graph showing the surviving members of each age group of a population over time
Down
- 1. population growth that is characterized by a period of slow growth, followed by a period of exponential growth , followed by a period of no growth
- 2. all of the physical, chemical, and biological factors that a species needs to survive, stay healthy and reproduce in an ecosystem
- 3. organism that is the first to live in a previously uninhabited area
- 5. movement of individuals out of a population
- 7. environmental factor that limits the growth and size of a population
- 10. dramatic increase in population over a short period of time
- 11. combined biotic and abiotic factors found in an area where organisms live
- 13. Sequence of biotic changes that regenerate a damaged community or start a community in a previously uninhabited area.
- 15. organisms that share a similar niche but live in different geographical regions