Population Ecology concerns the dynamics of species populations and how they interact with the environment and with other populations. We are particularly interested in populations' responses to environmental change, with the ultimate goal of predicting their responses to future change. Most of our work on forest birds, and some on seabirds, overlaps with spatial ecology in its focus on patterns of population processes at different scales. Recent and current research by Kirsten Bowser, Kevin Kelly, Lauren Scopel and Erin Whidden, all on seabirds, falls under this category. One possible (common) response to the changing climate is changing timing of breeding (phenology), and our results on puffins are included in a global review of seabird phenological change by an international team led by Katherine Keogan of Edinburgh University, published in Nature Communications, and also in a review of phenological change in the Gulf of Maine ecosystem currently under review by the journal Fisheries Oceanography.