Table 1. Reef fish taxa that contributed disproportionately to dissimilarity in fish community composition between 1981 and 2012 on coral reefs of the Mataiva lagoon.
Mean densities (# per 250 m2 ± 1 SD), consistency ratios, and individual and cumulative contributions (in %) to differences between years are shown. The consistency ratio is calculated as a species’ average dissimilarity contribution divided by the standard deviation of dissimilarity values. The species in grey has a consistency ratio <1, which indicates an uneven contribution to community dissimilarity across sites. The analysis was conducted on square-root-transformed data (see Methods) but untransformed densities are presented here.
| Species | Mean density (SD) | Consistency ratio |
Individual contribution (%) |
Cumulative contribution (%) |
|
|---|---|---|---|---|---|
| 1981 | 2012 | ||||
| Chlorurus sordidus | 9.9 | 51.1 | 1.62 | 10.64 | 10.6 |
| (18.9) | (33.7) | ||||
| Chromis viridis * | 26.7 | 34.1 | 1.37 | 8.46 | 19.10 |
| (29.3) | (49.3) | ||||
| Dascyllus aruanus * | 7.2 | 23.2 | 1.20 | 6.08 | 25.17 |
| (11.5) | (29.5) | ||||
| Acanthurus triostegus | 5.0 | 2.8 | 1.30 | 4.11 | 29.28 |
| (6.9) | (10.4) | ||||
| Thalassoma hardwicke | 1.2 | 6.9 | 1.49 | 3.77 | 33.05 |
| (2.0) | (6.1) | ||||
| Stegastes nigricans * | 1.5 | 10.7 | 0.64 | 3.51 | 36.56 |
| (4.2) | (21.4) | ||||
| Scarus spp | 8.6 | 5.5 | 1.25 | 3.05 | 39.61 |
| (14.9) | (5.0) | ||||
| Chaetodon lunulatus * | 2.3 | 4.3 | 1.45 | 3.04 | 42.66 |
| (4.8) | (4.4) | ||||
| Halichoeres trimaculatus | 0 | 3.9 | 1.24 | 2.87 | 45.53 |
| (0) | (5.1) | ||||
| Amblygobius phalaena | 10.2 | 8.7 | 1.26 | 2.42 | 47.94 |
| (9.0) | (5.6) | ||||
Notes.
*
species considered to be reliant on live coral for shelter or food.