a measure of diversity which takes into account the number of species present

A measure of diversity which takes into account the

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a measure of diversity which takes into account the number of species present and their relative abundance in proportion to the total population o as species richness and evenness increase, so diversity increases o value of D ranges between 0 and 1 with this index, 1 represents infinite diversity and 0, no diversity 0.7 and above = high diversity 0.3-0.7 = average diversity 0.3 and below = low diversity Shannon Index o accounts for the order or abundance of a species within a sample plot o often used for identifying areas of high natural or human disturbance 1.5 – 3.5 = common 1.5 – 2.0 = average 2 and above = high Comparison of ecosystems in determining changes over time in a given region are utilized in determining measures of biodiversity in an ecosystem level Beta-diversity o describing changes in biodiversity within or between ecosystems o indicates the difference and variation in species richness between two different habitats or within a single community at different points in time o involves comparing the number of taxa that are unique to each of the ecosystems
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Gamma-diversity o on an even larger scale, measurement of the overall or total biodiversity for the different ecosystems within a region o also termed as the “geographic-scale species diversity” o pertains to landscape diversity of habitats within a landscape or region Keystone species o another indicator of biodiversity which researchers often track and measure o integral to ecosystem processes
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