Multiple Choice
Which of the following is characteristic of oligotrophic lakes?
48. Ecology
Introduction to Ecology
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Communities that exist in the aphotic zone ultimately depend on food manufactured by chemoautotrophic bacteria or __________.
A
algae and cyanobacteria that also live in the aphotic zone
B
decomposers
C
scavengers
D
minerals found on the ocean bottom
E
algae and cyanobacteria that live in the photic zone
Verified step by step guidance1
Understand the aphotic zone: The aphotic zone is a part of the ocean where sunlight does not penetrate, making photosynthesis impossible for organisms living there.
Identify the primary producers: In the absence of sunlight, organisms in the aphotic zone rely on other sources of energy. Chemoautotrophic bacteria are primary producers that use chemical energy to produce food.
Consider the role of algae and cyanobacteria: Although they cannot live in the aphotic zone due to the lack of light, algae and cyanobacteria in the photic zone (where sunlight is available) perform photosynthesis and produce organic matter.
Recognize the dependency on the photic zone: The organic matter produced by algae and cyanobacteria in the photic zone can sink to the aphotic zone, providing a source of food for organisms living there.
Conclude the dependency: Communities in the aphotic zone ultimately depend on the organic matter produced by algae and cyanobacteria in the photic zone, as well as on chemoautotrophic bacteria for their energy needs.
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