robert brown first proposed the concept of ecological pyramid true or false
Answers
Answer:
There are several different factors that control the primary productivity of energy and biomass flow. Energy flow is the amount of energy that moves through a food chain. The energy input, or energy that enters the ecosystem, is measured in Joules or calories. Accordingly, the energy flow is also called calorific flow. In the study of energy flow, ecologists try to quantify the importance of different species and feeding relationships.
The largest source of energy for an ecosystem is the sun. Energy that is not used in an ecosystem is eventually lost as heat. Energy and nutrients are passed around through the food chain, when one organism eats another organism. Any energy remaining in a dead organism is consumed by decomposers. Nutrients can be cycled through an ecosystem but energy is simply lost over time.
An example of energy flow in an ecosystem would begin with the autotrophs that take energy from the sun. Herbivores then feed on the autotrophs and change the energy from the plant into energy that they can use. Carnivores subsequently feed on the herbivores and, finally, other carnivores prey on the carnivores.
In each case, energy is passed on from one trophic level to the next trophic level and each time some energy is lost as heat into the environment. This is due to the fact that each organism must use some energy that they received from other organisms in order to survive. The top consumer of a food chain will be the organism that receives the least amount of energy.
Hairston and Hairston (1993)^ , believe that there is a cause and effect relationship that results in any given trophic structure. Specifically, they state that it is trophic structure, rather than energetics that controls the amount of energy consumed at each trophic level and that "ecological efficiencies" are the product of a trophic structure, not a determining factor. Further, they state that trophic structure is instead the result of competition and predator-prey interactions. It is important to remember that many species may occupy each trophic level and are so subject to interspecific competition. This is especially true for producers, carnivores, and decomposers
Answer:
FALSE..
Explanation:
Robert T. Paine. Such species are described as playing a critical role in maintaining the structure of an ecological community, affecting many other organisms in an ecosystem and helping to determine the types and numbers of various other species in the community.