Question

What is its significance in an aquatic ecosystem?

Answer 1

1. Indicator of Pollution Level: BOD measures the amount of oxygen required by bacteria and other microorganisms to decompose organic matter in water. A high BOD indicates a high level of organic pollution, which means more oxygen is being consumed for decomposition.
2. Oxygen Availability: High BOD leads to depletion of dissolved oxygen in water. Since aquatic organisms such as fish and invertebrates require dissolved oxygen to survive, a high BOD can result in oxygen deficiency, causing stress or death to aquatic life.
3. Eutrophication and Ecosystem Health: Elevated BOD often accompanies eutrophication, which is the excessive nutrient enrichment in water bodies causing algal blooms. When algae die and decompose, they increase BOD further, leading to oxygen depletion and disruption of aquatic food chains.
4. Water Quality Assessment: Monitoring BOD is crucial for assessing the water quality of lakes, rivers, and ponds. It helps in evaluating the effectiveness of wastewater treatment and pollution control measures, as untreated or poorly treated sewage increases BOD and harms aquatic ecosystems.