Monday, April 10, 2017

Energy flow in an ecosystem




Discussion:
  • The first diagram above shows the "SINGLE CHANNEL MODEL OF ENERGY FLOW"
  • In this model, the energy is shown to move across various trophic levels in a linear fashion with only a small amount of energy being transferred to subsequent trophic levels, a small part being used for the organisms for metabolic activities like respiration, digestion, hunting, etc and a major part of the energy being lost to the environment as heat
  • Upon death, both plants and animals are decomposed by the decomposers or saprotrophs that live in the soil.
  • These decomposers remove the last energy from the living organisms. They also decompose the remains of the organisms to release the nutrients into the soil.
  • The second diagram represents the universal model of energy flow where a species population is represented by energy inputs and links with other species as a conventional species oriented food web diagram.
  • It is applicable to any living component
  • The model represents a species population in which appropriate energy inputs and links with other species would be shown as a conventional, species oriented food web diagram.
  • The model also represents a discrete energy level where biomass and energy channels represent all or part of many populations supported by the same source
  • The 'Y' shaped or two channel energy flow model, shows the symbiotic relationship between the consumers in the grazing food chain and the decomposers in the detritus food chain.
  • In all the energy flow models, it is seen that the "SUN" is the PRIMARY SOURCE of energy and the FATE of ALL ENERGY is for it to be LOST AS HEAT to the ecosystem. This follows the fundamental LAW OF CONSERVATION OF ENERGY that states that "ENERGY CAN NEITHER BE CREATED NOR DESTROYED BUT CAN ONLY BE CONVERTED FROM ONE FORM TO ANOTHER"
  • However, chemotrophs that lie at the bottom of the ocean use chemical reactions to derive energy as sunlight cannot penetrate to those depths

19 comments:

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    Excellent diagram here. related to energy flow in an ecosystem. Thanks for your information.
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