Stomach temperature variations in a Cape Gannet Morus capensis as an index of foraging activity and feeding rates

Animal-mounted electronic devices are powerful tools for studying seabirds at sea. The potential handicap of additional load should be minimised, while nevertheless measuring relevant field data. In this paper, we show how records from a 16g stomach temperature logger may be used to calculate the key values of foraging effort and feeding rate in an avian marine predator.