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N90, a Diversity Index Sensitive to Variations in Beta Diversity Components
| Content Provider | MDPI |
|---|---|
| Author | Enric, Massutí Farriols, M. Teresa Ordines, Francesc |
| Copyright Year | 2021 |
| Description | Species diversity in a community is mainly related to the number and abundance of species that form it. $N_{90}$ is a recently developed diversity index based on the results of the similarity percentage (SIMPER) analysis that represents the number of species contributing up to ninety percent of within-group similarity in a group of samples. The calculation of $N_{90}$ is based on the Bray–Curtis similarity index and involves the number of species and abundances in a group of samples. We have explored the properties of $N_{90}$ compared to other alpha, beta and gamma diversity indices and to beta diversity measures accounting for nestedness and turnover. We have used a non-real data set to compare the values of all indices with $N_{90}$ and two real data sets of demersal fish communities along large and short depth gradients with higher influence of turnover and nestedness, respectively, to correlate the same indices with $N_{90}$. The sensitivity of $N_{90}$ to reductions in the frequency of occurrence and the evenness of the distribution of species abundances among samples allows the detection of diversity loss due to the fishing-induced retreatment of species populations to localities presenting the most favorable ecological conditions. This property, both in the identification of species replacement and species loss through SIMPER analysis, make $N_{90}$ a useful indicator to support the Ecosystem Approach to Fisheries within the current context of global change. |
| Starting Page | 489 |
| e-ISSN | 14242818 |
| DOI | 10.3390/d13100489 |
| Journal | Diversity |
| Issue Number | 10 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-06 |
| Access Restriction | Open |
| Subject Keyword | Diversity Microbiology Beta Diversity Similarity Species Richness Species Replacement Species Loss Turnover Nestedness |
| Content Type | Text |
| Resource Type | Article |
