Question #26 Which unintended consequence is most likely a result of using rapid, lumber-cutting technology on a large scale in the tropical rainforest? A increased flooding of nearby towns B decreased trading with other countries C increased risk for forest fires D decreased amounts of short shrubs
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We have the following options: A. increased flooding of nearby towns B. decreased trading with other countries C. increased risk for forest fires D. decreased amounts of short shrubs The most likely unintended consequence would be the one that is directly Show more…
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Text: Energy and Nutrient cycling 1) You are conducting a study on the effects of fire exclusion across two watersheds in a temperate forest in Oregon. In one watershed, any wildfires have been rapidly extinguished and no prescribed burns have been conducted for the last 100 years, leading to a buildup of pathogens and parasites on the dominant tree species. In the other watershed, prescribed fires have been used as a management strategy every 10 years over the same window of time, periodically removing small understory plants and releasing some of the nutrients that had been sequestered in the burned plant tissue back into the watershed. a. In which watershed might you expect to find more biomass? Where would you expect to find more sequestered carbon (in both living and dead tissue)? Explain. b. In which watershed might you expect to find higher GPP? What about higher NPP? Explain. 2) What accounts for the observation that on average, each trophic level in an ecosystem only holds about 10% of the biomass of the trophic level directly below it? How does this relate to the fact that all the largest animals on earth (e.g. blue whales) are primary consumers? 3) Can energy be recycled indefinitely within an ecosystem? What about nutrients? Discuss what your answers imply regarding the need for continuous inputs of both matter and energy in order for an ecosystem to continue functioning. 4) Name and justify the factor you would expect to be the main constraint on productivity in: a. A desert ecosystem in the southwest United States? b. The bottom of the Atlantic Ocean? c. A tropical rainforest? d. The Siberian Tundra? 5) Using your understanding of trophic energy transfer efficiency, make the case that a vegetarian diet is objectively a more efficient and sustainable diet. Explain.
Sri K.
Complete the following paragraph to describe how climate change is impacting ecosystems.
Mj A.
Q30 Why do logged tropical rain forest soils typically have nutrient-poor soils? a. Tropical bedrock contains little phosphorous. b. Logging results in soil temperatures that are lethal to nitrogen-fixing bacteria. c. Most of the nutrients in the ecosystem are removed in the harvested timber. d. The cation exchange capacity of the soil is reversed as a result of logging. Q31 Patterns of succession are such that different communities of plants are dominant at different times. Why is this so? Q32 Researchers have been studying a rare population of eighty-seven voles in an isolated area. Ten voles from a larger population were added to this isolated population. Besides having ten additional animals, what benefits are there to importing individuals? a. Additional animals from a distant population will likely bring genetic diversity and reduce inbreeding depression. b. Additional animals will bring additional competition and could hurt the population. c. Additional animals would increase beneficial genetic drift. d. There is no benefit other than increasing the overall population size. Q33 The Hubbard Brook watershed deforestation experiment revealed that ________. I) deforestation increased water runoff II) nitrate concentration in waters draining the deforested area became dangerously high III) calcium levels remained high in the soil of deforested areas only I only II only III only I and II
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