Biotic Component > Decomposers

Microorganisms like bacteria and fungi that break down dead plants and animals into simpler substances and recycle nutrients back into the environment are called decomposers.

• Death of organism: Plants and animals die, leaving behind organic matter (dead tissue).
• Colonisation: Decomposers (bacteria, fungi, actinomycetes) colonise the dead matter.
• Enzymatic breakdown: Decomposers secrete extracellular enzymes that break down complex organic molecules (proteins, carbohydrates, lipids) into simpler inorganic substances.
• Nutrient release: Simpler substances (nitrates, phosphates, minerals) are released into soil/water.
• Reabsorption: Producers absorb these nutrients, continuing the cycle of matter through the ecosystem

• Recycle essential nutrients (carbon, nitrogen, phosphorus) back into the biosphere.
• Prevent accumulation of dead organic matter on Earth's surface.
• Maintain continuity of biogeochemical cycles, allowing life processes to continue like an unending chain.
• Improve soil fertility through humus formation.
• Support primary producers by making nutrients bioavailable.

• Decomposers are microorganisms, primarily bacteria and fungi, that break down dead organic matter to recycle essential nutrients back into the environment.
• They operate by colonizing dead tissue and secreting extracellular enzymes that convert complex organic molecules into simpler inorganic substances.
• These released inorganic nutrients, such as nitrates and phosphates, enrich the soil and water, becoming readily available for primary producers to absorb.
• Key examples include soil bacteria (Bacillus, Pseudomonas), fungi that degrade tough plant materials like cellulose (Rhizopus, Aspergillus), and actinomycetes (Streptomyces) that aid in humus formation.
• Ecologically, they are crucial for preventing the accumulation of dead matter, improving soil fertility, and maintaining the continuous flow of global biogeochemical cycles.