Establecimiento de cuatro especies de Quercus en el sur de la ...

Capítulo 4
seedlings with summer irrigation increased their probabilities of survival in 60.9%
relative to those without irrigation, according to model predictions. These percentages
were 45.4, 37.7 and 35.5 for Q. faginea, Q. suber and Q. ilex, respectively. In addition,
for Q. suber other factors were involved, such as seed mass and the interaction terms
between light availability and mother tree, and light availability and soil moisture.
Thus, cork oaks responded differently to light conditions depending on both mother
tree and water availability in the soil. The response to light was either positive or
negative depending on mother tree.
Quercus ilex subsp ballota
Quercus suber
Probability of emergence
1.0
0.8
0.6
0.4
0.2
0.0
-2 -1 0 1 2 3
Residuals of seed mass
nce
Probability of emerge
1.0
0.8
0.6
0.4
0.2
0.0
-2 -1 0 1 2 3
Residuals of seed mass
Quercus faginea
Quercus pyrenaica
Probability of emergence
1.0
0.8
0.6
0.4
0.2
0.0
-2 -1 0 1 2 3
Residuals of seed mass
emergence
Probability of
1.0
0.8
0.6
0.4
0.2
0.0
-2 -1 0 1 2 3
Residuals of seed mass
mother 1
mother 2
mother 3
mother 4
mother 5
Figure 2. Predicted probabilities of emergence from a binomial generalized linear model (GLMM) across
values of seed mass. The residuals from regressing mother tree against seed mass were taken to avoid
collinearity problems and to identify the unique contribution of seed mass, independent of mother tree
on the probability of emergence. Different maternal plants are depicted by different symbols.
Intersecting curves indicate a significant interaction between maternal plant and the residuals of seed
mass, and only one line indicates a significant independent effect of residuals of seed mass.
117