. Which of these ecosystems has the lowest net primaryproduction per square meter?(A) a salt marsh(B) an open ocean(C) a coral reef(D) a tropical rain forest
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. Which of these ecosystems has the lowest net primary
production per square meter?
(A) a salt marsh
(B) an open ocean
(C) a coral reef
(D) a tropical rain forest
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- Organisms at the first trophic level ________. a. capture energy from a nonliving source b. are eaten by organisms at lower trophic levels c. are shown at the top of an energy pyramid d. are consumersIf the human population were to stabilize tomorrow and never reach 8 billion people, would that solve all our environmental problems? Why or why not? What conditions might get better, and what challenges might remain?Our review of biogeochemical cycles underscores the importance of primaryproduction to ecosystems and biomes, but what controls rates of primary production?
- Earth has a total of 11.9 billion gha of productive land. How many people could Earth supportsustainably if the average ecological footprint were 8 gha per person (as in the United States)?Why do most food chains not go beyond the 4th or 5th trophic level?Which is not a gaseous biogeochemical cycle in ecosystem?
- At which point in the trophic pyramid is the greatest arount (not percentage) of energy lost? A) Between the primary producers and the primary consumers B) Between the primary consumers and the secondary consumers C)Between the secondary consumers and the tertiary consumers D) Between the secondary consumers and the primary producersNet primary production per unit area is likely to be highest in which of the following ecosystems?a. grasslandsb. desertsc. temperate deciduous forestsd. tropical rain forestsAlberta Einstein might have said once that: “if the bee disappears from the surface of the earth, man would have no more than four years to live. No more bees, no more pollination, no more plants, no more animals, no more man.” Pollination is an example of a large-scale process with significant implications for humans described as a/an: a) Trophic pyramid b) Ecosystem engineer c) Ecosystem service d) Trophic cascade which one?
- EcosystemA hasprimary production of 1000 g C /m2/yr and ecological efficiency of 10%. Ecosystem B has primary production of 300 g C /m2/yr and an ecological efficiency of 25%. a.Which ecosystem will have more production at thesecondary consumer (carnivore) trophic level? b.Which ecosystem is more likely to support an endothermic primary consumer (herbivore)? c.If atrophic level requires at least 1 gC/m2/yr in order to exist, how many trophic levels can each of these ecosystems support?d.Given your answer to part c, which do you thinkhas a larger impact on the energy available at upper trophic levels: primary productivity or efficiency of energy movement across trophic levels?Why does nature favor raising the gross primary productivity while man tends to raise the net primary productivity?The number of trophic levels an ecosystem can support is driven by… (select all that apply) A- The amount of energy available (primary productivity) B- The speed of nutrient cycling (decomposition) C- The population size of top predators in the ecosystem D- The efficiency of energy transfer across trophic levels E- The composition of the plant community
