Habitat Suitability Modeling for the Newell's Shearwater on Kauai

In a recent article (Troy et al. 2014), JRT made an error when calculating unconditional standard errors for averaged parameter coefficients of a habitat suitability model for the Newell's shearwater Puffinus newelli, resulting in incorrect z-statistic values, P-values (based on two-tailed tests), and 95% confidence intervals for those averaged parameters (Table 4 in Troy et al. [2014]). Corrected values are provided in the new version of Table 4 below. The 95% confidence intervals for averaged model parameter coefficients now slightly overlap zero for all variables except slope of the terrain. The P-values for proportion of native vegetation cover, percent rock fragment composition from 0 to 76.2 cm in soil depth (or from 0 cm to covered bedrock <76.2 cm in depth), and the squared term for percent rock composition all increased from the previous reporting. However, more importantly, all are still significant at the alpha level (P < 0.15) that we originally stipulated for model averaging (Troy et al. 2014). In addition, odds ratios and signs of averaged parameter coefficients (Table 4) support our original hypotheses about the potential relationship between these variables and Newell's shearwater distribution (Table 1 in Troy et al. [2014]). Our interpretation of the averaged habitat suitability model and the discussion presented in Troy et al. (2014) remain the same.