Figure 5.
Correlation between species position along rainfall gradient and species drought performance and growth rates in the field. Drought performance in the field was quantified in terms of survival as the ratio of percent survival in the dry forest relative to percentage survival in the wet forest. Survival for each forest was calculated as the number of seedlings surviving at the end of 2 years relative to number of seedlings alive 2 months after planting in the field (in %). Growth performance in the field was quantified as the ratio of absolute growth rates in dry forest relative to the absolute growth rates in the wet forest. (a) rainfall minimum and survival ratio, (b) rainfall optimum and survival ratio, (c) rainfall minimum and ratio of absolute growth rate of height (AGR height), and (d) rainfall minimum and ratio of absolute growth rate of diameter (AGR diameter). Regression lines, coefficients of determination (R 2), and significance level (*p < 0.05) and nonsignificant (ns) are shown. The correlation is based on 18 species whose response curves were constructed (Amissah et al., 2014). Inventory data were not available for the other five species; hence, their response curves could not be constructed