Which organism type is primarily responsible for energy production in an ecosystem?

Producers are the fundamental organisms responsible for energy production in an ecosystem. They are primarily photosynthetic organisms, such as plants and certain types of algae and bacteria, that convert sunlight into chemical energy through the process of photosynthesis. This process not only produces the energy needed for the producers' own growth and reproduction but also forms the base of the food web by providing energy for consumers, which rely on producers for their sustenance.

In contrast, decomposers break down dead organic matter, releasing nutrients back into the environment but do not produce energy. Consumers depend on producers for their energy as they consume either plants or other animals. Detritivores also feed on dead organic material but are distinct from decomposers in how they contribute to nutrient cycling. Therefore, it is clear that producers play a critical role in capturing and converting energy, thereby sustaining the entire ecosystem.