Notes on lesson on Ecosystem |



Introduction to Ecosystem

This note provides information about the ecosystem and its types, biomass and ecological Niche. For a species to maintain its population, its individuals must survive and reproduce. Certain combinations of environmental conditions are necessary for individuals of each species to tolerate the physical environment. The term ecosystem was first coined by A.G Tansley in 1935 and it was derived from two greek words 'eco' and the 'system' where eco means environment and system mean interaction or interdependent. According to A.G. Tansley ecosystem is the system resulting from the integration of abiotic and biotic components of an environment.

Pond ecosystem

This note provides information about pond ecosystem. Pond ecosystem is a type of lentic, freshwater ecosystem with the complex interaction between its biotic and abiotic components. Dissolved oxygen refers to the level of free, non-compound oxygen dissolved or present in water or any other liquid. Biological Oxygen Demand (BOD) and Dissolved Oxygen (DO) govern the kind of organisms present in water. BOD is the amount of oxygen required by bacteria in the pond in a unit volume of water at a specified time.

Grassland ecosystem and Energy flow through an ecosystem

Grassland ecosystem is an open terrestrial ecosystem. This note provides information about grassland ecosystem. Energy flows in an ecosystem. The grassland ecosystem is a type of terrestrial ecosystem with the open land of grasses in which there are constant interactions between the biotic communities and abiotic factors.

Food chain, Food web and ecological pyramids (Functional aspect of ecosystem)

This note provides information about the food chain, food web, and ecological pyramid. The transfer of food energy from one trophic level to another trophic level in an ecosystem by the repeated process of eating and being eaten is known as food chain. A food web can be defined as the natural interconnection of food chains and generally a graphical representation (usually an image) of what - eats - what in an ecological community.

Mountain ecosystem

This note provides information about mountain ecosystem and its importance. Mountain provides a scattered but diverse array of habitats in which a large range of plants. The pyramid of the predatory type of food chain is upright as there is a gradual decrease in the number, biomass, and energy. In the parasitic type of food chain, the pyramid of number is found to be inverted as there is the increase in number from producers to consumers.