#ecosystem regulation

Controls Ecosystem

Biotic control' refers specifically to:

“Top-down control” for biotic control' refers specifically to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Ecosystem processes are constrained by energy conservation and by the cycling of matter. Energy enters mainly through primary production, is lost as metabolic heat at every transfer, and therefore cannot be recycled in the way that carbon, nitrogen, phosphorus, or water can. The remaining alternatives—“Abiotic factors”, “Bottom-up control”, “Nutrient limitation”—refer to different states,

Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 4

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Species Control

Control involving predators controlling prey:

“Top-down control” for control involving predators controlling prey. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species management must identify the demographic stage and ecological process that most strongly limits population growth. Prevention, early detection, removal, habitat manipulation, and biological control act at different points in an invasion or recovery trajectory. The remaining alternatives—“Bottom-up control”, “Wasp-waist control”, “Abiotic control”—refer to different states, p

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21

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Species Control

Example of top-down control:

“Removing predators” for example of top-down control. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Effective control reduces propagule pressure or population growth without causing unacceptable non-target effects. Repeated monitoring is necessary because seed banks, dormant stages, recolonization, and density-dependent compensation can reverse short-term gains. The remaining alternatives—“Nutrient addition”, “Herbivore increase biomass”, “Plants controlling animals”—refer to different states, p

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21

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Ecosystem Ecology & PRODUCTIVITY

Which component of the ecosystem primarily regulates ecological processes and supports life systems?

Energy flow is a fundamental functional process that sustains ecosystem organization. Producers capture solar energy through photosynthesis, or chemical energy through chemosynthesis, and store part of it in organic molecules. Consumers and decomposers transfer that chemical energy through feeding and decomposition, while respiration at every trophic level releases much of it as heat. Because heat cannot be completely recycled into biological work, energy moves directionally and requires continual input. This flow constrains food-chain length, biomass at higher trophic levels, and rates of pro

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17

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