Table 9 Plant species richness and cover model selection results for the top five performing models and the null model for each richness measure. Type = vegetation type
Response variable | Model structure | k | AIC | ΔAIC |
|---|---|---|---|---|
Total richness | Treatment × year × type | 23 | 1891.7 | 0 |
Treatment × year + type | 14 | 1963.5 | 71.8 | |
Year | 5 | 1975.2 | 83.5 | |
Treatment + year | 9 | 1982.5 | 90.8 | |
Treatment + year + type | 10 | 1983.1 | 91.4 | |
Null (random effects only) | 3 | 2145.9 | 254.2 | |
Exotic richness | Treatment × year × type | 23 | 1315.7 | 0 |
Treatment × year + type | 14 | 1369.4 | 53.7 | |
Year | 5 | 1387.7 | 72 | |
Treatment + year + type | 10 | 1393.7 | 78 | |
Treatment + type | 9 | 1393.8 | 78.1 | |
Null (random effects only) | 3 | 1580.9 | 265.2 | |
Total cover | Treatment + type + year | 10 | 17,913 | 0 |
Treatment + type × year | 14 | 17,918 | 5 | |
Treatment × year + type | 14 | 17,920 | 7 | |
Treatment × type × year | 23 | 17,922 | 9 | |
Treatment + type | 9 | 17,926 | 13 | |
Null (random effects only) | 3 | 17,940 | 26.7 | |
Exotic cover | Treatment × type + year | 14 | 2985.3 | 0 |
Treatment + year + type | 10 | 2987.9 | 2.6 | |
Treatment × type × year | 23 | 2988.2 | 2.9 | |
Treatment × year + type | 14 | 2992.2 | 6.9 | |
Treatment + year | 9 | 3004.4 | 19.1 | |
Null (random effects only) | 3 | 3018.1 | 32.8 |