People, Development and Environment
9.5
Concept Box
Trophic Levels in an Aquatic System
1.
Oligotrophic:
Low in nutrients and hence low
biological productivity. They typically have
clear water with high oxygen levels, this support
species like trout.
2.
Mesotrophic:
Intermediate level of nutrients
and biological productivity. They support more
productivity.
3.
Eutrophic:
Thy are high in nutrients, particularly
nitrogen and phosphorus, thus have high biologi-
cal productivity in terms of abundant plant and
algal growth. This leads to problems like algal
blooms and low oxygen levels in deeper waters
due to the decomposition ...
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