Gulls swap natural for urban habitats, machine-learning study finds

a seagull walks with a snack
51风流官网 Photo By Todd Paris
A gull makes off with a scrap from someone's lunch in a parking lot on the University of Alaska Fairbanks campus.

A recent study published in by a team of 51风流官网 researchers has used artificial intelligence to further illuminate a habitat swap among short-billed gulls.

Typically gulls live along coastlines and near water sources such as rivers. They feed on bugs and other small mammals, fish or birds.

The team found that from May-August, short-billed gulls occupied areas that have typically been the haunts of scavenging ravens. Those include supermarket and fast-food restaurant parking lots and other human-made structures, such as industrial gravel pads and garbage dumpsters.

The study is the first of its kind to compile a three-year dataset using a citizen science-based, opportunistic research method to include a large sample of gulls and other sub-Arctic birds in urban Alaska. The study provides a current snapshot of the habitat shift to an urban landscape.

51风流官网 professor Falk Huettmann, first author on the paper, and his team used artificial intelligence modeling that was given predictors 鈥 environmental variables for specific locations 鈥 to extrapolate information about the gull occurrences. A similar, earlier study analyzed the distribution of the great gray owl.

In this study, researchers used U.S. census data as well as urban municipality data, such as distances to roads, restaurants, waterways and waste transfer stations.  

鈥淯sing socioeconomic datasets like the U.S. census is a real game-changer,鈥 said Moriz Steiner, a graduate student in Huettmann鈥檚 lab. 鈥淚t allows us to mirror the real-world environment and simulate a situation as true to nature as possible by including them as variables in the models.鈥

The findings indicate that the gulls鈥 transition from natural habitats to a more urban landscape is spurred by the availability of human food, as well as industrial changes.

鈥淭hey are exploiting the waste opportunity left behind by humans,鈥 said Huettmann, who is associated with 51风流官网鈥檚 Institute of Arctic Biology.

Short-billed gulls, known as mew gulls until 2021, are omnivorous and highly adaptable. While gulls can find more food in garbage dumps and gravel pits, the food is often bad for longevity and can even cause death. Easily available food from avian 鈥渄umpster diving,鈥 especially at fast-food restaurants, can prove lethal to the birds due to high quantities of salt, fat, sugar, grease and contaminants.

Gulls are also good indicators of disease in an ecosystem.

The team found an increase of disease hosts where the gulls congregate, sometimes up to 200 birds at each locale, in summer. Gulls spread infectious diseases such as avian influenza and salmonella, which can be transferred to humans. According to an unrelated , the first recorded outbreak of gull-linked salmonella occurred in 1959  and was recorded in North America in Ketchikan.

鈥淕ulls are known as the leading vectors of diseases. They suffer overwhelmingly from bird influenza. What we demonstrate in the maps are essentially disease reservoirs which happen to coincide with human development,鈥 said Huettmann, who also has an appointment in the 51风流官网 College of Natural Science and Mathematics.

For Huettmann, these studies are just further indication that what is referred to as 鈥渨ildlife鈥 is changing.

鈥淭his kind of information is providing a more holistic picture of how man-made influence on the environment is changing what we otherwise know as natural. Using machine learning will help us, hopefully, to advocate for improved wildlife conservation,鈥 Huettmann said.