For Indian Ocean humpback dolphins off Goa’s coast, fishing nets may offer feeding opportunities, while tourist boats often bring disturbance. A recent study, published in the journal Marine Ecology Progress Series, examined how the endangered species balances these competing responses when tourism and fisheries overlap in the same waters. “Tourism and fisheries are among the most common human activities in the habitats used by these dolphins. We were interested in how dolphins respond when they have to balance disturbance from boats with the opportunity to access food resources,” says Imran Samad, corresponding author of the study and a scholar at the Centre for Ecological Sciences, Indian Institute of Science. Watching dolphins from above The study was carried out in north Goa between October 2023 and April 2024. The region supports relatively high densities of Indian Ocean humpback dolphins and also experiences intensive fishing and dolphin-watching tourism activity. Researchers monitored dolphin groups from elevated coastal vantage points. Once dolphins were sighted, they followed the animals using a drone, flown at a height of 60-100 metres above sea level. “Traditionally, dolphin behaviour is studied either from the shore using theodolites (monoculars used to estimate dolphin positions) or from boats. We used drones, which allowed us to observe animals from above and follow individuals and groups without directly disturbing them,” says Samad. Over six months, the team conducted 90 focal follows of dolphin groups and recorded 19 hours of dolphin footage. The footage was then analysed using machine-learning tools that tracked dolphin movements…This article was originally published on Mongabay
