“Puffin environment” refers to the full suite of oceanographic, ecological, and climatic conditions that shape the lives of puffins across the North Pacific and North Atlantic. These seabirds occupy a dynamic interface between land and sea: breeding on coastal cliffs and islands, then dispersing widely over continental shelves and open oceans outside the breeding season. Their environment is therefore not a single place, but a shifting mosaic of habitats defined by biological oceanography.
At its core, biological oceanography determines where and when food is available. Puffins depend on dense aggregations of small, energy-rich prey—such as capelin, sand lance, herring, anchovy, and squid— whose distribution is governed by currents, temperature structure, and plankton productivity. These prey species occupy key positions in marine food webs, often forming “wasp-waist” systems in which a few forage species transfer energy from plankton to higher predators. Puffins must track these ephemeral prey patches, making them sensitive indicators of ecosystem change.
Large marine ecosystems used by puffins differ between within and between ocean basins but share common features: strong seasonal productivity, shelf-edge fronts, and upwelling zones. In the North Atlantic, systems like the Barents Sea or Gulf of Maine are shaped by temperature gradients and mixing regimes; in the North Pacific, regions such as the Gulf of Alaska and Bering Sea are influenced by large-scale currents and wind-driven upwelling. These processes structure prey fields and ultimately determine breeding success.
Ocean climate integrates these physical drivers over longer timescales. Variability in temperature, stratification, and circulation alters plankton communities and cascades through food webs to puffins. Ocean climate change—particularly long-term warming—has already shifted prey distributions poleward and altered their timing, creating mismatches between chick-rearing and peak food availability. Marine heatwaves represent the most acute disturbances. Rapid, extreme warming events can collapse forage fish populations, reduce prey quality, and trigger widespread seabird die-offs. For puffins, the “environment” is thus a finely tuned balance of ocean physics and biology—one increasingly disrupted by climate-driven change.
Work in Progress – More details coming in the future!