Farallon Institute scientists have been analyzing diet data from three puffin species in Alaska. Puffin diet data were collected since the 1970s by the USGS Alaska Science Center, Alaska Maritime National Wildlife Refuge Seabird Monitoring Program, and the Institute for Seabird Research and Conservation. Researchers from these agencies collected data from approximately 40 sites around the Gulf of Alaska and across the Aleutian Islands (map below).  

Tufted puffin. Photo copyright by Ron LeValley.

Tufted puffin. Photo copyright by Ron LeValley.

In order to study puffin diet, field biologists collect samples of the fish and invertebrates (such as squid) that adult puffins bring back to nest burrows to feed to chicks. These diet samples are brought to the lab where they are identified to species, weighed, and measured. For diet analysis, Farallon Institute organized the sample data in a database that contains over 100,000 records of the fish and invertebrate samples collected at the nest burrows, and their sizes. Research and data collection are ongoing, but a paper describing temporal variation in puffin diet from 1978-2012 is currently in review. Variation in puffin diet over time can be indicative of changes in the local fish community, which may be driven by large-scale environmental factors. By studying puffin diet at so many sites, we can also explore how changes in fish communities might happen differently in different places.

Locations of monitored puffin colonies in Alaska, shown with a 50-km foraging radius.

Locations of monitored puffin colonies in Alaska, shown with a 50-km foraging radius.