L15_15_Biodiversity

3 of all individuals species b 333 of all individuals

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Unformatted text preview: d near the gap. The gap species give the rainforest resilience against other disturbances (e.g., climate change, human disturbance, landslides) How do we measure biodiversity? Alpha diversity - - the diversity as measured by coun;ng the total number of species (or genera, families, etc.) in an ecosystem, region, etc. How do we measure biodiversity? Alpha diversity - - the diversity as measured by coun;ng the total number of species (or genera, families, etc.) in an ecosystem, region, etc. This is a simple way of gauging biodiversity, but it does not always capture the whole picture. Consider this scenario: Simpson’s diversity index is a way to account for ‘commonness’ of different species: S = 1 – [(propor;on of species 1)2 + (propor;on of species 2)2 + … ] consider an ecosystem with three species: Species A à༎ 90 % of all individuals Species B à༎ 5 % of all individuals Spceice C à༎ 5 % of all individuals S = 1 – [ 0.92 + 0.052 + 0.052 ] = 0.185 Simpson’s diversity index is a way to account for ‘commonness’ of different species: S =...
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