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The number of species in a given community can be increased by

A) Disturbance only

B) Predation only

C) Competetive exclusion only

D) Disturbance and Predation only

E) Disturbance, predation and competitive exclusion

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Tod Thiel
Tod ThielLv2
6 Nov 2019
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Related questions

21- Define carrying capacity and understand how it can affectpopulation size.

22- Compare and contrast density-dependent and densityindependent factors that affect population growth.

23- Compare and contrast opportunistic and equilibrium lifehistory adaptations.

24- Explain the interactions in communities and ecosystems.

25- Compare and contrast competition, mutualism, commensalism,parasitism, herbivory, and predation.

26- Describe competitive exclusion.

27- Explain how species interactions can lead tocoevolution.

28- Describe and give examples of the importance of keystonespecies.

29- Compare and contrast primary and secondary succession.

30- Explain the roles of producers, consumers and decomposers inan ecosystem.

Certain ecosystem characteristics often undergo predictable changes during succession. Early session can be found with lots of disturbance and late to session is seen at equilibrium without much disturbance at all. Consider this to community types of secondary succession:
1. In Oldfield that was abandoned six years ago
2. A 100 year old mixed pine hardwood forest
In paragraph form predict which community you would expect to have the greatest diversity and also the lower standing biomass(dry weight of living material in a community; this is commonly expressed as weight per unit area), the greater stability and the slowest nutrient cycle rate. In each case explain your answer by defending your logic.

1. What is a “lognormal” distribution? Have you heard this kind of a distribution under a different name?

Lognormal distribution is a distribution of relative abundances of species by plotting the abundance of species as a frequency distribution in which each abundance interval is twice the preceding one (1, 2, 4, 8).

-It is a statistical expectation

-Product of many random environmental variables acting on the population of species

2. Why would a species survey with a greater sample size show a more complete lognormal distribution than a survey with a smaller sample size?

3. What two factors are considered in a quantitative diversity index? How do these factors differ from each other?

4. Explain how environmental heterogeneity can generate both aquatic and terrestrial plant diversity.

5. Consider the intensity of some disturbance in a community along a gradient (low… medium… high intensity). Use a “Goldilocks and the Three Bears” analogy to explain how species diversity can be shaped by disturbance along such a gradient.

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