Across
- 2. creates habitat for other species
- 4. energy available for higher trophic levels
- 7. two species exploit a habitat differently so they do not encounter each other
- 8. one species improves habitat conditions allowing other species to colonize the habitat but itself does not benefit from these species
- 13. result when two species cannot avoid competing with each other
- 16. begins after gene flow is disrupted between populations
- 18. can be explained by adaptive radiation or mass extinction or lack of time resolution in fossil record
- 19. form of parasite that consumes or kills its host as it emerges (like in 'Alien')
- 20. rates of this vary with temperature and moisture and oxygen availability
Down
- 1. selection favors phenotypes which can avoid competition allowing multiple species to coexist
- 3. range of biotic and abiotic conditions that can be occupied by a species
- 5. species which are all dangerous but gain shared protection by resembling each other
- 6. two populations which are reproductively isolated from one another
- 9. hybrids are sterile which reinforces speciation
- 10. can prevent competitive exclusion allowing species to coexist
- 11. necessary process performed by biodiversity which would be prohibitively expensive if humans had to perform it through technology
- 12. can cause species to be exposed to changing environmental conditions over time as a result of plate tectonics
- 14. isolating mechanism that prevents hybrids from forming
- 15. top-down trophic interaction which can increase community diversity by changing resource availability
- 17. cold nutrient-rich water being brought to the surface by strong offshore winds or the Coriolis effect