Q: What are species richness and species evenness? How does each of
What are species richness and species evenness? How does each of these components of species diversity contribute to the value of the Shannon-Wiener diversity index (H ')? How do species evenness and...
See AnswerQ: Compare the “trophic” niches of warblers and diatoms as described
Compare the “trophic” niches of warblers and diatoms as described by MacArthur (1958) and Tilman (1977). Why is it important that the ecologist be familiar with the niches of study organisms before ex...
See AnswerQ: Communities in different areas may be organized in different ways. For
Communities in different areas may be organized in different ways. For instance, C. Ralph (1985) found that in Patagonia in Argentina, as foliage height diversity increases, bird species diversity dec...
See AnswerQ: According to the intermediate disturbance hypothesis, both low and high levels
According to the intermediate disturbance hypothesis, both low and high levels of disturbance can reduce species diversity. Explain possible mechanisms producing this relationship. Include trade-offs...
See AnswerQ: What is the Hardy-Weinberg principle? What is Hardy-
What is the Hardy-Weinberg principle? What is Hardy- Weinberg equilibrium? What conditions are required for Hardy-Weinberg equilibrium?
See AnswerQ: Winemiller (1990) deleted “weak” trophic links from one
Winemiller (1990) deleted “weak†trophic links from one set of food webs that he described for fish communities in Venezuela (see fig. 17.3). What was h...
See AnswerQ: What is a keystone species? Paine (1966, 1969)
What is a keystone species? Paine (1966, 1969) experimented with two sea stars that act as keystone species in their intertidal communities along the west coast of North America and in New Zealand. De...
See AnswerQ: Explain how the experiments of Lubchenco (1978) showed that feeding
Explain how the experiments of Lubchenco (1978) showed that feeding preferences, population density, and competitive relations among food species all potentially contribute to the influences of “keyst...
See AnswerQ: When Power (1990) excluded predaceous fish from her river sites
When Power (1990) excluded predaceous fish from her river sites, the density of herbivorous insect larvae (chironomids) decreased. Use the food web described by Power to explain this response.
See AnswerQ: Using Tscharntke’s food web (1992) shown in figure 17.
Using Tscharntke’s food web (1992) shown in figure 17.5, predict which species would be most affected if you excluded the bird at the top of the web, Parus caeruleus. Wha...
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