Download - Ecological indices report 2222222
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Diversity Indices• Shannon Species Index• Species Richness • Pielou Index of Evenness• Margalef Species Richness
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Objectives:
• Determine the importance of using Ecological indices in conducting ecological studies.
• Use the formula Shannon Species Index, Pielou Index of Evenness, Species Richness and Margalef Species Richness to solve an Ecological study simulation.
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Ecology• Physiological Ecology Applications• Population Ecology• Community Ecology• Ecosystem Ecology
Why do we need to study Ecology?
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Ecological Diversity
• Relates to the different forms of life which are present in a particular site.
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Diversity Index
• A diversity index is a mathematical measure of species diversity in a community.
• Diversity indices provide more information about community composition than simply species richness (i.e., the number of species present); they also take the relative abundances of different species into account
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Diversity Index
• Diversity indices provide important information about – rarity – commonness of species in a community.
The ability to quantify diversity in this way is an important tool for biologists trying to understand community structure.
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Shannon Species Diversity Index
• The Shannon diversity index (H) is another index that is commonly used to characterize species diversity in a community.
• Shannon's index accounts for both abundance and evenness of the species present.
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Practice: Determine species diversity using Shannon Species Diversity Index
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Transfer your data in the tableSpecies #Individual Pi lnPi Pi (lnPi)
1
2
3
4
5
Total = H’=
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Pielou’s Index of Evenness
• Refers to HOW close in numbers each species in an environment are.
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Species Richness and Margalef Species Richness
• Species richness is a measure for the total number of the species in a community.
• This measure is strongly dependent on sampling size and effort.
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THE END