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27 Jun 2019

Structural complexity of ecological communities is often correlated with species richness. Explain why this is so, using a specific community as an example.

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Beverley SmithLv2

30 Jun 2019

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Match the term with the correct description.

Locavore

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Ecological diversity

Reproductive isolation

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a.	Measures richness and complexity of a community
b.	Those that are naturally rare or have been locally depleted to a level that puts them at risk
c.	Measures variety of different versions of same genes within a species
d.	In undisturbed ecosystems, the background rate appears to be one species per decade
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f.	Organisms that breed in nature and produce fertile offspring
g.	Contain 75% of the worldâs most threatened mammals, birds, and amphibians
h.	A person who eats locally grown, seasonal food
i.	Considered to be in imminent danger of extinction
j.	Measures number of different kinds of organisms within a community

1) Explain why we typically find more species under conditions of intermediate disturbance compared to either rare or frequent disturbance. (Ch. 18)

2) Why might you expect communities with fewer species to contain fewer trophic levels? (Ch. 18)

3) How do ecologists distinguish between primary and secondary succession? (Ch. 19)

4) When using a chronosequence to document the pathway of succession, what are the assumptions? (Ch. 19)

5) Why should we not expect a single climax community within a biome? (Ch. 19)

6) Compare and contrast the concepts of facilitation, inhibition, and tolerance in the context of ecological succession. (Ch. 19)

7) When a community experiences succession, why does the species richness of a community initially increase, then plateau, and finally decline? (Ch. 19)

8) Why do early- and late-successional species tend to possess different adaptations? (Ch. 19)

9) Why is the efficiency of energy transfer between two trophic levels generally quite low? (Ch. 20)

10) How do ecologists distinguish between gross primary productivity and net primary productivity? (Ch. 20)

11) Compare and contrast the measurement of primary productivity in terrestrial vs. aquatic systems. (Ch. 20)

12) What factors limit the net primary productivity of terrestrial systems? (Ch. 20)

orangedolphin399

1)In the Arroyo Seco, the Western Toad feeds on beetles, bees, and small aquatic insects. The Bull Frog has been introduced and eats the same foods. The based on this information interaction between these two species can best be described as:

2)Introduced species such as the Polyphagous Shot Hole Borer can damage the communities they are introduced to by:

changing communities to have a uniform distribution

providing food for native species

increasing species richness

spreading new parasites and diseases

3)Species that compete for the same resources often switch to either use different resources or find ways to reduce competition. Why is this often true?

introduced (exotic species) are always going to be the best competitors

to avoid parasites

direct competition harms both species, even the superior competitor

competition only benefits one of the species