Akaike top five linear mixed effect models and the null model results for an 11-yr Massasauga hibernation habitat study located in southern Ontario, Canada. The models are (A) Life-zone size (LZ [cm]), (B): thermal buffering function (TBUFF), and (C) groundwater dissolved oxygen (ln GWDO). Fixed effects include winter type (1–3) or PC1, or PC2, site (Mined or Not Mined) or site soil depth (cm), flood (before and after) or weather cycles (dry and wet), and LZ size (cm). For all analyses, random effects were Well ID, date, and year (null model). The top models are marked by an asterisk.