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#redundancy hypothesis

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SPECIES HYPOTHESIS

Redundancy hypothesis states:

Redundancy means that multiple species can perform overlapping ecological functions. If one disappears, another member of the same functional group may partly compensate, buffering ecosystem processes until too many substitutes—or a nonredundant contributor—are lost. Biodiversity–function hypotheses differ in how they assign ecological importance among species. Complementarity emphasizes distinct contributions, redundancy emphasizes overlap and compensation, rivet theory emphasizes cumulative weakening, keystone theory emphasizes particular influential species, and idiosyncrasy emphasizes context dependence. Real communities can display several patterns because functions differ and environmental conditions alter interactions. Richness alone therefore cannot identify mechanism; species traits, relative abundance, functional groups, and the order of species loss must also be considered. In this context, the keyed term, Some species can replace others, identifies the relevant mechanism or quantitative relationship and links the observed pattern to its underlying ecological cause. The distinction is testable by measuring changes in organisms, resources, or process rates through time rather than relying on the label alone.

Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation

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ECOLOGICAL SUCCESSION

What does 'functional group' imply in redundancy hypothesis?

A functional group comprises species that perform similar ecological roles, such as nitrogen fixation, grazing, pollination, or decomposition, even if they are not close relatives. In the redundancy hypothesis, overlap within such a group allows one species to compensate partly for loss of another. A functional relationship should be interpreted by asking whether change is gradual, buffered, abrupt, or irregular. Gradual loss is consistent with accumulating contributions; an initial plateau suggests compensation; an abrupt drop points to loss of a disproportionately important species; and an irregular curve indicates identity-dependent effects. These are conceptual expectations, not immutable laws. Different ecosystem processes—such as productivity, decomposition, pollination, or resistance—may follow different curves in the same community because they depend on different organisms and interactions. In this context, the keyed term, Same ecological role, identifies the relevant mechanism or quantitative relationship and links the observed pattern to its underlying ecological cause. The distinction is testable by measuring changes in organisms, resources, or process rates through time rather than relying on the label alone.

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20

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ECOLOGICAL SUCCESSION

Redundancy hypothesis implies function is maintained until:

The redundancy hypothesis groups species with overlapping ecological roles. Loss of one member may have little immediate effect because another can compensate, but function declines after losses remove enough members—or a uniquely important member—to cross the system's effective functional threshold. Biodiversity–function hypotheses differ in how they assign ecological importance among species. Complementarity emphasizes distinct contributions, redundancy emphasizes overlap and compensation, rivet theory emphasizes cumulative weakening, keystone theory emphasizes particular influential species, and idiosyncrasy emphasizes context dependence. Real communities can display several patterns because functions differ and environmental conditions alter interactions. Richness alone therefore cannot identify mechanism; species traits, relative abundance, functional groups, and the order of species loss must also be considered. In this context, the keyed term, Critical species are lost, identifies the relevant mechanism or quantitative relationship and links the observed pattern to its underlying ecological cause. The distinction is testable by measuring changes in organisms, resources, or process rates through time rather than relying on the label alone.

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20

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