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Ecosystem complexity was once thought to reduce stability by enabling the effects of disturbances, such as species loss or species invasion, to spread and amplify through the network. However, other characteristics of network structure have been identified that reduce the spread of indirect effects and thus enhance ecosystem stability. [24]
Ecological threshold is the point at which a relatively small change or disturbance in external conditions causes a rapid change in an ecosystem.When an ecological threshold has been passed, the ecosystem may no longer be able to return to its state by means of its inherent resilience.
A freshwater aquatic and terrestrial food web A biocenosis (UK English, biocoenosis , also biocenose , biocoenose , biotic community , biological community , ecological community , life assemblage ), coined by Karl Möbius in 1877, describes the interacting organisms living together in a habitat ( biotope ). [ 1 ]
A food pyramid and a corresponding food web, demonstrating some of the simpler patterns in a food web. A graphic representation of energy transfer between trophic layers in an ecosystem. Energy flow is the flow of energy through living things within an ecosystem. [1]
The linkages in a food web illustrate the feeding pathways, such as where heterotrophs obtain organic matter by feeding on autotrophs and other heterotrophs. The food web is a simplified illustration of the various methods of feeding that link an ecosystem into a unified system of exchange.
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The exception to this generalization is when portions of a food web are supported by inputs of resources from outside the local community. In small, forested streams, for example, the volume of higher levels is greater than could be supported by the local primary production. Energy usually enters ecosystems from the Sun.
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