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    Shannon Diversity Index - Do you need the same species across sites to compare?

    What type of regression would you suggest is best to use? I'm analyzing my data on SPSS.
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    Shannon Diversity Index - Do you need the same species across sites to compare?

    Well the index for from 2013 to 2018 can be seen to drop which indicates overall diversity is decreasing over time? Is a stats test required to see if they’re significant?
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    Shannon Diversity Index - Do you need the same species across sites to compare?

    Hello, I comparing fish diversity from the years 2013 to 2018 in a freshwater river system. There are however different species present in some years. Can I still use the Shannon Index to compare diversity? I have attached my calculations below. Thank you!