Table 3. Effects of flooding on biomass and tree diversity in 26 plots before (2011) and after (2015) the Jirau hydroelectric dam in the upper Madeira River.
| Live AGB | Dead biomass | Absolute biomass change over time | Fisher’s alpha | |||||
|---|---|---|---|---|---|---|---|---|
| Effect | L-ratio(df) | P | F-ratio(df) | P | F-ratio(df) | P | L-ratio(df) | P |
| FIxHabitat | 32.02 (10;7) | <0.0001 | 14.25 (44;47) | <0.00001 | 26.82 (44;47) | <0.0001 | 32.07 (10;7) | <0.0001 |
| FI | 68.13 (10;6) | <0.0001 | 57.83 (44;48) | <0.00001 | 101.07 (44;48) | <0.0001 | 70.63 (10;6) | <0.0001 |
| Habitat | 44.23 (10;4) | <0.0001 | 12.67 (44;50) | <0.00001 | 23.20 (44;45) | <0.0001 | 52.95 (10;4) | <0.0001 |
Flood Index (FI) is the number of consecutive days that a plot remained flooded in 2014 and habitat type (terra firme, transitional, várzea and campinarana forests) were predictors with significant interaction in all models. Live aboveground biomass (AGB) was evaluated with a linear mixed effects model, including plot as a random effect. Dead biomass and absolute biomass change over time were evaluated with simple linear regression (R2 adjust = 84.05% and 90.31%, respectively, p<0.0001). Response of Fisher’s alpha diversity index was assessed with a mixed effects model, including transect as a random component.