Relationships between nest presence and abundance and their four most influential predictors.

<p>Figures showing the relationship between (a) orangutan nest presence and (b) orangutan nest abundance and their four most influential predictors in the final saturated hurdle Species Distribution Model. Solid lines are the robust linear regression fit using Huber weights and fitted by Iterated Re-weighted Least Squares and indicate the direction of the relationship between the response and predictor variables. The relative importance of each predictor is given in parentheses on the <i>x</i>-axis. Note: abundance fitted values are ln transformed and zero values are not presented.