Analysis
Observations of spatial and temporal activity patterns can potentially provide insights into predator-prey relationships as animals perceive their environment through time and space (Hut, Kronfeld-Schor, van der Vinne, & De la Iglesia, 2012). Because species interactions are often complex and difficult to identify we used photographic data to examine temporal overlap at nest platforms among tree voles and four other taxa that were potential predators. We classified these potential nest predators as flying squirrels, owls, weasels, or probing/digging birds. For each nest predator we created detection/non-detection encounter histories by binning data at 1-hour, 1-day, or 1-week time bin-widths, creating logistic regression models at each bin-width that represented predator-prey temporal overlap. We also constructed monthly encounter histories (1-month bin-width) to quantify multi-annual trends of activity at nest platforms.