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of photosynthesis in maintaining ecosystem?
Protozoan ecology is the interaction in space and time of protozoa (flagellates, amoeboid organisms and ciliates) with other living organisms and the physical environment. It encompasses, among other factors, sources of food and energy used to sustain life, food web dynamics, the role of protozoa in maintaining fertility of ecosystems and adaptive strategies for survival in varying habitats. Among the physical environmental (abiotic) factors, temperature, salinity, nutrients and levels of pollutants, when present, are major sources of influence. A complex set of interactions exists among microbial biota, including the role of nutrient regeneration during protozoan predation on bacteria resulting in release of nutrients due to digestion and disruption of the bacteria during feeding. These nutrients in turn are reutilised by algae during photosynthesis. This process of cyclical nutrient uptake by algae and subsequent release by protozoan predation is known as ‘the microbial loop’.
> For a long time the significance of biological diversity in the world’s oceans was unclear. It is now known to play a vital role in maintaining the functionality and productivity of ecosystems. It also makes habitats more resilient to environmental change. But the well-balanced species communities are becoming increasingly unstable.
Explain the role of forest in maintaining the balance ..
Understanding the role of the soil in the farm ecosystem, and knowing how to manage theland, are critical and difficult tasks facing the organic farmer. The soil's biologicaland electrochemical processes cannot be observed directly since they take place at amicroscopic and sub-molecular level. Changes in fertility, tilth and structure may takeyears to become evident. Early indicators are subtle, and the farmer must be a keenobserver to spot them. This chapter reviews the biological, chemical and physicalproperties of the soil as a background to sound management. Much of the material will befamiliar; the key difference is the recognition of the vital role soil micro-organismsplay in recycling, releasing, and storing plant nutrients. Organic farmers use techniquesthat support and enhance the biological life of the soil, which in turn nurtures the cropand maintains soil structure.
Explain the role of forest in maintaining the balance between ..
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