Aquatic Primary Productivity is Most Limited by Which of the Following

Question

Aquatic primary productivity is most limited by which of the following?
A) light and nutrient availability
B) predation by primary consumers
C) increased pressure with depth
D) pollution
E) temperature

Accepted Answer

Aquatic primary productivity is often limited by the availability of nutrients and light. Light penetration decreases with depth and nutrients can be limited in some aquatic environments. Predation, pollution, and temperature can also affect aquatic productivity, but are not the primary limiting factors in most cases. Increased pressure with depth may also affect aquatic life, but it is not directly related to primary productivity.