The Shannon index, also known in the literature as Shannon-Weaver, is used to quantify specific biodiversity. The symbol H 'is used to represent it, and its values range between positive numbers, generally between 2, 3 and 4.In the literature, this index is one of the most popular for measuring biodiversity.
The index takes into account the number of species that exist in the sample and the relative number of individuals for each of the species. That is, it contemplates the richness and abundance of the species.
Denoted as H, this index is calculated as:
H = -Σpi * ln(pi)
The Shannon Equitability Index is a way to measure the evenness of species in a community. The term “evenness” simply refers to how similar the abundances of different species are in the community.
Denoted as EH, this index is calculated as:
EH = H / ln(S)
where:
pi: The proportion of the entire community made up of species i
H: The Shannon Diversity Index
S: The total number of unique species
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The index takes into account the number of species that exist in the sample and the relative number of individuals for each of the species. That is, it contemplates the richness and abundance of the species.
Denoted as H, this index is calculated as:
H = -Σpi * ln(pi)
The Shannon Equitability Index is a way to measure the evenness of species in a community. The term “evenness” simply refers to how similar the abundances of different species are in the community.
Denoted as EH, this index is calculated as:
EH = H / ln(S)
where:
pi: The proportion of the entire community made up of species i
H: The Shannon Diversity Index
S: The total number of unique species
#bookmark
Paul 混亂中…
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无脊椎生物学实验课，统计堆肥盒里面物种数量。
一开始浇水过多，尝试抽出未果：香农-威纳指数显著下降，环节虫/果蝇/寄生蜂等全灭。 盒子里充斥大量蛾蚋幼虫不停地蠕动，污泥被翻滚搅拌，甚是反胃。 细致观察样本很久，成为全班唯一找到线虫的人 (p1-p3)。红螨翻出来寥寥几只，皆没快速跑开，大概是死了。
最后浇入高浓度酒精，不忍心看翻滚挣扎的虫子们，感觉略有抱歉。留了几只蛾蚋在培养皿里，继续吃晚上剩下的一小片番茄，就当是补偿吧。
一开始浇水过多，尝试抽出未果：香农-威纳指数显著下降，环节虫/果蝇/寄生蜂等全灭。 盒子里充斥大量蛾蚋幼虫不停地蠕动，污泥被翻滚搅拌，甚是反胃。 细致观察样本很久，成为全班唯一找到线虫的人 (p1-p3)。红螨翻出来寥寥几只，皆没快速跑开，大概是死了。
最后浇入高浓度酒精，不忍心看翻滚挣扎的虫子们，感觉略有抱歉。留了几只蛾蚋在培养皿里，继续吃晚上剩下的一小片番茄，就当是补偿吧。