Q: Most of the energy that flows through a forest ecosystem flows through
Most of the energy that flows through a forest ecosystem flows through detritus-based food chains, and the detritus consists mainly of dead plant tissues (e.g., leaves and wood). In contrast, most of...
See AnswerQ: In their initial studies, leading to the trophic cascade hypothesis,
In their initial studies, leading to the trophic cascade hypothesis, Stephen Carpenter and his colleagues (1991) found a negative correlation between zooplankton size and phytoplankton primary product...
See AnswerQ: Since increased phytoplankton biomass decreases water clarity in lakes, how should
Since increased phytoplankton biomass decreases water clarity in lakes, how should increased fishing pressure on the bass population in a lake ecosystem, such as that pictured in figure 18.12, affect...
See AnswerQ: Suppose that when you add nitrogen to one-half of a
Suppose that when you add nitrogen to one-half of a lake, you observe no change in phytoplankton biomass, but when you add phosphorus to the other half of the lake, phytoplankton biomass more than dou...
See AnswerQ: Suppose you fertilize a lake with nitrogen only, phosphorus only,
Suppose you fertilize a lake with nitrogen only, phosphorus only, and nitrogen plus phosphorus and observe no change in phytoplankton biomass. What is the most likely explanation of your results?...
See AnswerQ: After years of successful reductions in phytoplankton populations, phytoplankton blooms are
After years of successful reductions in phytoplankton populations, phytoplankton blooms are on the increase in parts of Lake Erie following the introduction of zebra mussels. Why?
See AnswerQ: The rate (in mg carbon/m3/h) at
The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function P = 100I/I2 + I + 4 where I is the light intensity (measured in thousands of...
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