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    Carmelics

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    Home/Original/inverse
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    Inverse View

    It is not the case that Species richness alone is insufficient as a measure of diversity

    ?Set your confidence on the premises below to see your aggregate.

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.A community of 50% species A and 50% species B has the same richness as a community of 99.9% species A and 0.1% species B
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    • 2.The first community is clearly more diverse (less homogeneous) than the second despite equal richness
      ?

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    • 3.If diversity produces stability through species interactions, a species comprising only 0.1% of a community has far less scope for interaction than one comprising 50%
      ?

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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.Phylogenetic distance between species—not mere species count—determines the functional redundancy and evolutionary novelty a community preserves.
      ?

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    • 2.Two communities with identical richness but different evolutionary lineages represent radically different reservoirs of genetic and adaptive information.
      ?

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    • 3.Noss's multiscale biodiversity framework (1990) explicitly identifies compositional, structural, and functional dimensions that species richness alone collapses into one misleading scalar.
      ?

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    Reason against 2 of 2
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    • 1.Functional trait diversity, as formalized by Petchey and Gaston (2002), predicts ecosystem process rates far better than species richness across empirical datasets.
      ?

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    • 2.A community dominated by functionally redundant species—even many of them—provides less ecological resilience than one with fewer but functionally distinct species.
      ?

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    • 3.Amartya Sen's capability approach, extended to ecosystems by Nussbaum and Norton, entails that diversity must be measured by the range of realized functions, not the count of bearers.
      ?

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    Strongest counterpoint
    Explore the most compelling reason on the other side.