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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Scalar(describing how species richness reduces biodiversity to one misleading number)
A single number or measurement that flattens something complex into one simple value.
Species richness(as an oversimplified approach to measuring nature's variety)
Simply counting how many different species exist in a place—the most basic and narrow way to measure biodiversity.
Structural dimension(as one of three ways to measure biodiversity)
The 'how' of biodiversity—the physical arrangement and organization of species in an environment, like how they're distributed across different habitats or layers.