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#beta diversity

3 public questions tagged with this topic.

BIODIVERSITY & IDH

Diversity due to differences in abundance of species is called:

Evenness measures how uniformly individuals are distributed among the species present. Two communities may contain the same number of species yet differ greatly in diversity if one is dominated by a single species while the other has comparable abundances throughout. Richness counts species without considering their relative numbers, whereas dominance emphasizes concentration in one or a few taxa. Turnover instead describes compositional change across places or times. Thus abundance differences are captured specifically by evenness, an essential component of indices such as Shannon diversity.

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

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BIODIVERSITY & IDH

What represents species turnover?

Beta diversity represents species turnover among communities, habitats, or sites. It is high when local assemblages share few species and low when they are compositionally similar. Pairwise turnover can be measured with dissimilarity coefficients such as 1 minus Jaccard or Sørensen similarity, while regional multiplicative partitioning uses β = γ/α. Alpha diversity describes diversity within one local community, and gamma diversity is the pooled diversity across the wider region. Delta diversity is sometimes applied to turnover across larger geographic gradients, but beta is the standard betwe

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

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BIODIVERSITY

Which region shows maximum α and β diversity respectively?

Alpha diversity describes richness and abundance within a single local community, whereas beta diversity describes compositional change among communities. Thus, identifying the region labelled Q as having maximum alpha diversity requires Q to contain the richest local assemblage, or the assemblage with the greatest combined richness and evenness if an index is supplied. Identifying S as having maximum beta diversity requires the greatest species turnover among its sampled sites: sites in S should share relatively few species and differ strongly in composition. Beta diversity is not simply the

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

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