2.4.3 SCB Nest Success
To compare the structure of abandoned woodpecker cavities to natural
cavities we used Welch’s tests for each set of measurements taken on all
cavities encountered (Field et al., 2012). We then followed the same
steps to create species specific logistic regression and model averages
for the four SCB (Nemes, Jonasson, Genell, & Steineck, 2009; Field et
al., 2012). Observations on the ATFL and the BCFL were combined given
the similarity of their body metrics and life history traits, and
hereafter are referred to as ATBC (Cardiff and Dittmann 2000). We used
the same six cavity metrics, with the addition of whether the nest was
located in an abandoned woodpecker cavity or a natural cavity (cavity
type). As before, we used the R packages MuMIn andAICcmodavg to evaluate candidate models and average parameter
coefficients per species.