What would happen in an ecosystem if there was less denitrification (compared to the past)? Over time__. Select one: a. nitrogen would accumulate in the ecosystem b. there would be a net loss of nitrogen from the ecosystem, and more N2 would be directly available to plants c. more N2 would be directly available to plants d. there would be a net loss of nitrogen from the ecosystem
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- A salmon feeds on crabs and small fishes, which in turn feed on zooplankton that feed on phytoplankton which in turn uses up nitrates in the water. If there are overfishing of salmons, which things should decrease? a. zooplanktonb. small fishc. phytoplanktond. a and de. b and cWhich biogeochemical cycle does not have a gaseous component but cycles from the land to sediments in the ocean and back to the land? (a) carbon cycle (b) nitrogen cycle (c) phosphorus cycle (d) hydrologic cycle (e) neither a nor c has a gaseous componentINTERPRET DATA Study the graph, which shows the combined effects of various factors on biological diversity in 12 different terrestrial and aquatic ecosystems. Which factor is most important overall? Why do you think that climate change and increasing atmospheric CO2 are represented as separate factors? What is nitrogen pollution? Adapted from Sala, O.E., et al., Science, Vol. 287 (2000).
- With antibiotic resistance rising, researchers are looking for ways to reduce the use of antibiotics. Instead of antibiotic-laced food, some cattle now get probiotic feed with cultured bacteria that can establish or bolster populations of helpful bacteria in the animals gut. The idea is that if a large population of beneficial bacteria is in place, then harmful bacteria cannot become established or thrive. Explain the ecological principle that is guiding this practice.In an ecosystem, energy? A) Cycles along with chemical nutrients B) comes ultimately from bacteria C) typically flows from consumers to producers to decomposers D) typically flows from producers through a series of consumersThe study on Global Ecology shows that USA uses 10.3 ha per indiviual but has only 6.7 ha per citizen available. The worlds population is now 7 billion and the globe as a whole has 1.7 ha for each person. Discuss in view of the above scenerio the question; 'Can our current habits of energy and resources use be sustained?'
- What is the difference in the behavior of matter and energy in ecosystems? Group of answer choices a. energy is necessary for ecosystems while matter is not b. energy enters and leaves continuously and matter does not c. matters enters and leave continuously and energy does not d. both move through ecosystems in similar ways (no difference) e. energy can only be captured by bacteria with special propertiesEcosystemA 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?Which of the following is a consequence of biologicalmagnification?(A) Toxic chemicals in the environment pose greater risk totop-level predators than to primary consumers.(B) Populations of top-level predators are generally smallerthan populations of primary consumers.(C) The biomass of producers in an ecosystem is generallyhigher than the biomass of primary consumers.(D) Only a small portion of the energy captured by producersis transferred to consumers.
- The Lazy River Environmental Group is a group of fishermen and environmentalists that have worked to assess and clean up the pollution from an old factory on the Lazy River. One early study revealed that species on the river had absorbed pollutants from the water. Select the Pollutant Levels in Tissue, by Species dataset and follow the interactive to graph the data. Which statement(s) correctly describe the graph? (Check all that apply.) The two species with highest levels are both fish.The two species with highest levels are both fish. Turtles had a pollutant level about three times that of clams.Turtles had a pollutant level about three times that of clams. No invertebrate (excludes fish and turtles) had a level above 0.05 ppm.No invertebrate (excludes fish and turtles) had a level above 0.05 ppm. The fish species with the highest level was about three times the value of the fish species with the lowest level.The fish species with the highest level was about three…Whichstatement about changing ecosystem properties during succession is false?a.Biomass increasesb.Community respiration increasesc.Primary production increasesd.Soil depths decreasee.Stream spiraling lengths decreaseWhich of the following is an abiotic component of the biosphere? (a) algae (b) insects (c) lichen (d) water (e) none of the above