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--- amc:ss2023:group-a:start [2023/07/26 01:21] – [2.2 schematic (osama)] ismail.santina-jarkass
+++ amc:ss2023:group-a:start [2023/07/26 01:23] (current) – [2.0 Materials and Methods] ismail.santina-jarkass
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-==Quantitaive methods of biodiversity determination== (Ismail)
+**Quantitaive methods of biodiversity determination** (Ismail)
 To describe species diversity in natural communities, ecologists categorize several indices which based on what they measure and what they represent. No specific weights are assigned to species, except for abundances (and for biomass in some indices). The same holds for the individuals within a species. Species richness measures of biodiversity by counting the number of different species in a given area. This measure is strongly dependent on sampling size and effort, but does not depend on each species weight in the sample pool. Richness-Evenness (or Richess-Abundance) indices measure in a way similar to the information theory concerning a code or message; by accounting for the weight of each species in the sample pool. A prime example of this is the Shannon-Wiener diversity index, expressed as such: