Mean diversity indices at species and genus levels in Massachusetts.
| Zone 5b | Zone 6a | Zone 6b | Statewide | |
|---|---|---|---|---|
| Species | ||||
| Simpson (SDI) | 0.1667 | 0.1371 | 0.1138 | 0.1269 |
| Shannon-Wiener | 2.5440 | 2.8776 | 2.9697 | 2.8964 |
| Evenness | 0.2780 | 0.2494 | 0.2309 | 0.2418 |
| Inverse SDI | 7.8419 | 11.9895 | 11.4339 | 11.2599 |
| Genus | ||||
| Simpson (SDI) | 0.3211 | 0.2413 | 0.2146 | 0.2342 |
| Shannon-Wiener | 1.8720 | 2.1454 | 2.2358 | 2.1693 |
| Evenness | 0.2322 | 0.2137 | 0.2177 | 0.2178 |
| Inverse SDI | 3.6318 | 4.8660 | 5.6464 | 5.1848 |