Two fundamental ideas underlie the ecosystem concepti these are energy flow and nutrient cycling. Energy, initially fixed from solar radiation into a chemical form by green plants, moves into herbivores as a result of their feeding on plants, and then moves on into carnivores as the herbivores are themselves consumed. Since herbivores rarely consume all the available plant material, and since carnivores do not eat every individual of their prey organisms, some living tissues are allowed to die naturally, which itself may involve parasites and pathogens [6], before being eaten. These dead tissues constitute an energy resource that can be exploited by scavengers, detritus feeders, and decornposers. Thus, we can classify all the organisms in any community in terms of their feeding relationships. In practice, a series of complex feeding webs are usually formed, relating each species to many others, whether as feeder or food.
Two fundamental ideas underlie the ecosystem concepti these are energy flow and nutrient cycling. Energy, initially fixed from solar radiation into a chemical form by green plants, moves into herbivores as a result of their feeding on plants, and then moves on into carnivores as the herbivores are themselves consumed. Since herbivores rarely consume all the available plant material, and since carnivores do not eat every individual of their prey organisms, some living tissues are allowed to die naturally, which itself may involve parasites and pathogens [6], before being eaten. These dead tissues constitute an energy resource that can be exploited by scavengers, detritus feeders, and decornposers. Thus, we can classify all the organisms in any community in terms of their feeding relationships. In practice, a series of complex feeding webs are usually formed, relating each species to many others, whether as feeder or food.
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