Phosphorous cycle supports the growth of phytoplankton. Fluctuations in the phosphorus cycle in aquatic ecosystems can leads to changes in the growth rates of aquatic populations.
Phosphorous cycle describes the phosphorous movement from lithosphere, hydrosphere and biosphere.
Aquatic phosphorus exhibits seasonal cycle. It peaks in spring, causing rapid growth of algae and plant, then decline.
As phosphorus fertilizer aids in the growth of crops, phosphorus supports the growth of photosynthetic organisms like phytoplankton, at the base of the marine food web.
Any fluctuation in this process can leads to changes in the growth rates of aquatic populations.
Thus, the correct option is a.
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