Across
- 2. The intimate living together of members of two species; includes mutualism, commensalism, and, in some classifications, parasitism.
- 6. The process in which species exert selective pressure on each other and gradually evolve new features or behaviors as a result of those pressures.
- 7. Evolution of a new species.
- 11. The functional role and position of a species in its ecosystem, including what resources it uses, how and when it uses the resources, and how it interacts with other species.
- 12. A symbiotic relationship between individuals of two different species in which both species benefit from the association.
- 13. A species that is restricted to a single region, country, or other area.
- 14. Species that require a narrow range of conditions or exploit a very specific set of resources.
- 18. The number of species present in a community (species richness), as well as the relative abundance of each species
- 20. Physical changes that allow organisms to survive in a given environment.
- 22. The number of individuals of a species in an area.
- 23. A relationship in which one organism feeds on another without immediately killing it.
- 24. The single environmental factor closest to a tolerance limit for a given species at a given time.
Down
- 1. Chemical or physical factors that limit the existence, growth, abundance, or distribution of an organism.
- 3. partitioning In a biological community, various populations sharing environmental resources through specialization, thereby reducing direct competition.
- 4. Species that tell us something about the health or condition of a biological community.
- 5. The ability of a community or an ecosystem to recover from disturbances.
- 8. The place or set of environmental conditions in which a particular organism lives.
- 9. A symbiotic relationship in which one member is benefited and the second is neither harmed nor benefited.
- 10. In primary succession on a terrestrial site, the plants, lichens, and microbes that first colonize the site
- 15. The number of species at each trophic level and the number of trophic levels in a community
- 16. Any force that disrupts the established patterns and processes, such as species diversity and abundance, community structure, community properties, or species relationships.
- 17. In ecological terms, a dynamic equilibrium among the physical and biological factors in an ecosystem or a community; relative homeostasis.
- 19. Species that tolerate a wide range of conditions or exploit a wide range of resources.
- 21. The mechanism for evolutionary change in which environmental pressures cause certain genetic combinations in a population to become more abundant; genetic combinations best adapted for present environmental conditions tend to become predominant.