Here are my answers for comparison with your own:
1 Gause's "competitive exclusion principle" states that:
D. no two species with identical niches can coexist indefinitely.
2 ?In the Lotka-Volterra competition equations, if a21 > 1, then:
3 A. interspecific competition is stronger than intraspecific competition.
4 D sympatric
5 D. fundamental
6 C. character displacement
7 B. parasite
8 D. away from light.
9 D. can reverse the outcome of competition.
10 D. both consumes cactus pads and introduces, as it attacks, fungi and bacteria that attack cactus pads.
11C. the sample standard deviation divided by the square root of the sample size
12B. coexistence of predator and prey with oscillating population sizes, but only in the presence of refuges and predator reservoirs.
13 B. feeding on tree roots before emerging as adult
14 D. bathe in water containing infective cercariae.
15 B. is likely to be effective, but poses ecological risks because Procambarus is not native to Africa.
16 D. mutualism.
17 A. Obligate
18 D. both enlarged thorns to host ant colonies and nectar from foliar nectaries.
19 D. soil nutrients.
20 D . reduced losses of seeds to seed predators.
1. species diversity is highest at intermediate frequencies of disturbance.
2. an association of interacting species inhabiting a defined area.
3. both few species are very abundant, and most species are moderately abundant.
4. warbler species diversity increases with habitat complexity.
5. different combinations of inorganic nutrients.
6. dramatic differences in plant communities.
7. The starfish Pisaster
9. the 95% confidence intervals for the two means do not overlap.
10. cultivate soft-scale insects, but still allow them to be attacked by parasitoids and predators.
11. a decrease in the dissolved oxygen in the deepest portions of Lake Victoria.
12. Both as snail density increases from low to medium the number of algal species increases and as snail density increases from medium to high, the number of algal species decreases.
13. Herbivore, parasite, carnivore, and detritivore
14. inedible plant tissues.
15. evaporates from soils plus the amount transpired by plants.
16. a single soil nutrient typically limits primary productivity.
18. grazing by herbivores in controlling primary productivity.
19. dead plant tissues.
20. increasing consumption of corn.
The 4th set is complete as well. Please rate and bonus the work as agreed. I will then post the 4th set