Table 1. Results of linear mixed models testing effects of deer exclosure and year on measures of plant community structure from the soil seed bank and aboveground vegetation.
Response | Deer exclusion | P | Year | P |
Seed Bank Germinants | ||||
Seedling richness | 3.706 | 0.054 | 143.58 | <0.001 |
Seedling diversity (Shannon-Wiener index) | 10.244 | 0.001 | 42.647 | <0.001 |
Total germinants | 5.234 | 0.022 | 81.972 | <0.001 |
Relative abundance annuals and biennials | 17.863 | <0.001 | 23.988 | 0.002 |
Proportion native species germinated | 4.679 | 0.031 | 55.309 | <0.001 |
Proportion native germinants | 4.784 | 0.029 | 42.948 | <0.001 |
Aboveground Vegetation | ||||
Aboveground species richness | 0.323 | 0.570 | 48.922 | <0.001 |
Aboveground diversity (Shannon-Wiener index) | 1.088 | 0.297 | 25.617 | <0.001 |
Aboveground cover | 0.027 | 0.870 | 40.953 | <0.001 |
Relative cover of annuals and biennials | 0.013 | 0.911 | 7.258 | 0.064 |
Woody stems | 17.731 | 0.035 | 3.678 | 0.597 |
Proportion native species | 11.046 | <0.001 | 65.777 | <0.001 |
Proportion native cover | 0.874 | 0.350 | 27.216 | <0.001 |
The year-by-deer exclusion interaction was never significant and subsequently dropped from all models; df = 5 for germinant models and df = 3 for aboveground vegetation models. Initial values shown are χ 2 values for likelihood tests excluding treatment of interest. Bold values denote statistical significance at P≤0.05.