LOS ANGELES — Dogs aren’t usually associated with clean beaches.
But new research has recognized border collies for their ability to chase off gulls that foul beach water and sand with their droppings.
The experiment was launched two years ago by researchers at Central Michigan University who were asked by the U.S. Environmental Protection Agency to find new ways to control a surging population of gulls that gather on the shores of the Great Lakes.
Not only do the birds swoop down to snatch sandwiches from picnickers and annoy beachgoers, they also defecate right where people swim. That makes them a major source of E. coli, bacteria that health officials test for as an indicator of pathogens that can make swimmers sick. When elevated levels are detected, authorities post warnings or close beaches.
Elizabeth Alm, a microbiologist at Central Michigan University who led the research, said a review of literature on the subject found a variety of bird-exclusion techniques using wires, strobe lights, lasers and pyrotechnics — but few that would be suitable for a public beach.