# Species Richness & Evenness (S, Margalef, Menhinick, J = H′/H′max) Richness S with Margalef/Menhinick indices, Shannon H′, Pielou evenness J, and Berger–Parker dominance from a named or plain species list. > Canonical page: https://elysiatools.com/en/tools/species-richness-evenness - **Category:** Health - **Keywords:** species richness, pielou evenness, margalef index, menhinick index, berger-parker dominance, community structure, biodiversity calculator, ecology calculator, quadrat sampling, species abundance, shannon evenness, field ecology ## Overview Paste a named species list or plain abundance counts to compute richness S, sample-size-corrected Margalef and Menhinick indices, Shannon H′, Pielou evenness J = H′/H′max, and Berger–Parker dominance of the most abundant taxon. ## Inputs - **Species counts (one per line, `name: count` or plain numbers)** (textarea): One species per line as `name: count` (separators : ; = , | or tab), or plain numbers separated by new lines, commas, or spaces. Duplicate names are merged by summing. ## When to use - After quadrat or plot sampling when you need S plus evenness and dominance in one step. - To compare communities of different sample sizes using Margalef d = (S−1)/ln N and Menhinick d = S/√N. - When abundances look skewed and you want Pielou J and Berger–Parker to quantify how uneven the assemblage is. ## How it works - Enter one species per line as name: count (separators : ; = , | or tab) or as plain numbers separated by newlines, commas, or spaces; duplicate names are summed. - The tool totals individuals N, counts unique species S, and identifies the dominant taxon. - It reports Margalef d, Menhinick d, Shannon H′, H′max = ln S, Pielou evenness J, and Berger–Parker dominance (proportion of the most abundant species). ## Use cases - Summarizing tree or herb counts from forest quadrats into richness, evenness, and dominance. - Classroom or lab exercises that contrast even versus dominated assemblages from the same N. - Rapid comparison of community structure between sites when only a species-abundance list is available. ## Frequently asked questions ### What input formats are accepted? Named lines such as Oak: 34 (or with ; = , | or tab) or plain numbers on separate lines or separated by commas or spaces. Duplicate names are merged by summing counts. ### How is Pielou evenness J calculated? J = H′ / ln S (i.e., H′ / H′max). Values near 1 indicate nearly equal abundances; lower values indicate dominance. ### What do the Margalef and Menhinick indices measure? Both correct richness for sample size: Margalef d = (S − 1) / ln N and Menhinick d = S / √N. Higher values mean more species relative to the number of individuals counted. ### Can I submit unnamed counts? Yes. Plain numbers are treated as successive species (Species 1, Species 2, …) so dominance can still be reported. ### What is Berger–Parker dominance? The proportion of all individuals that belong to the single most abundant species. 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