Yes, phytoplankton are considered primary producers. They play a crucial role in aquatic ecosystems by converting sunlight into energy through the process of photosynthesis. Just like plants on land, phytoplankton use sunlight, carbon dioxide, and nutrients from the water to produce organic matter.
This process not only forms the base of the food web in marine and freshwater environments but also contributes significantly to the planet’s oxygen supply. In fact, it is estimated that phytoplankton are responsible for producing about 50% of the Earth’s oxygen.
In summary, by harnessing solar energy, phytoplankton provide the foundational energy source for a wide range of marine organisms, making them essential primary producers in the aquatic ecosystem.