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#species loss

2 public questions tagged with this topic.

SPECIES HYPOTHESIS

Which hypothesis stresses that loss of *any* species reduces function?

The fixed key is scientifically inconsistent. Loss of any species reducing total function is the defining expectation of complementarity, because every species contributes a distinct role. Keystone theory instead predicts disproportionately large effects from losing particular influential species, not equivalent reductions after every species loss. Ecosystem function can respond to diversity through niche partitioning, facilitation, insurance, or a sampling effect. Niche differences allow more complete resource use, asynchronous responses stabilize aggregate output, and high richness increases

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

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SPECIES HYPOTHESIS

In rivet hypothesis, species loss impacts:

The rivet hypothesis predicts accumulating, often stepwise deterioration as species are removed. Individual losses may initially have small effects, yet each removes part of the system's functional support, so resilience and performance decline and eventual collapse becomes increasingly likely. Species richness counts taxa but does not show their abundance, traits, or interaction strengths. Dominant species may control bulk process rates, rare species may provide specialized functions or future insurance, and predators can restructure whole food webs through indirect effects. Functional groups

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

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