Scelta multipla
Below the photic zone of the ocean, __________.
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48. Ecology
Introduction to Ecology
Scelta multipla
Which of the following is characteristic of oligotrophic lakes?
A
Seasonal O2 depletion
B
Summer turnover
C
Frequent algal blooms
D
Animals that are tolerant of low-oxygen conditions
E
Few littoral plants and a low density of phytoplankton
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Understand the term 'oligotrophic lakes': These are lakes with low nutrient concentrations, which typically result in clear waters with low productivity.
Consider the characteristics of oligotrophic lakes: They usually have high oxygen levels throughout the year due to low organic matter decomposition.
Analyze the options: Seasonal O2 depletion and animals tolerant of low-oxygen conditions are more characteristic of eutrophic lakes, which have higher nutrient levels and more organic matter.
Evaluate the option 'Frequent algal blooms': This is also typical of eutrophic lakes, where high nutrient levels promote algal growth.
Identify the correct characteristic: Oligotrophic lakes have few littoral plants and a low density of phytoplankton due to their low nutrient levels, which limits plant and algal growth.
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