What did you learn from studying the 'culture in which dolphins and humans cooperate in fishing'?
In the town of
Foraging synchrony drives resilience in human–dolphin mutualism | PNAS
https://doi.org/10.1073/pnas.2207739120
Fishing in synchrony brings mutual benefits for dolphins and people in Brazil, research shows | Oregon State University
https://today.oregonstate.edu/news/fishing-synchrony-brings-mutual-benefits-dolphins-and-people-brazil-research-shows
An Incredible Thing Happens When Dolphins And Humans Team Up: Science Alert
https://www.sciencealert.com/an-incredible-thing-happens-when-dolphins-and-humans-team-up
You can see how Laguna fishermen and dolphins actually work together in the video below.
Dolphins Lending a Hand-YouTube
A fisherman who casts a net in the sea up to his waist.
In Laguna, a cooperative relationship has been going on for more than 140 years, in which `` dolphins hunt down a group of mullet to the coast, and fishermen throw nets according to the signal that dolphins strike their heads and tails on the surface of the water ''.
Sometimes dolphins come just 2 to 5 meters from the shore and chase the mullet together with the fishermen.
“We knew that fishermen were observing dolphin behavior to determine when to cast their nets, but dolphins were actively interacting with fishermen,” said Mauricio Cantor, a marine biologist at Oregon State University. I didn't know if they were coordinating,' he said, adding that the focus of his research was whether dolphins were actively cooperating with humans.
Dolphins use echolocation (echolocation) using ultrasonic waves to grasp the surrounding situation and find food.
Cantor's research team used drones, underwater cameras, and underwater microphones to study the interaction between dolphins and fishermen.
Studies have shown that fishermen walk in the direction of dolphins when they come to shore and cast their nets at a higher rate when dolphins are present. They found that fishermen who chased dolphins were 17 times more likely to catch fish in shallow water and caught four times more fish. 'Dolphins clearly provide a catch benefit to fishermen,' the research team said.
In addition, the dolphins approach the fisherman immediately and send signals, and when the fisherman throws the net, the dolphin increases the clicking sound used for echolocation, and it can be seen that the dolphin stays underwater for a longer time while the net is sinking. It turns out. Underwater footage also showed dolphins pulling fish directly out of their nets, and fishermen said they often took fish from their nets.
Ultimately, the research team concluded that dolphins engaged in human interaction were able to eat more fish, increasing their chances of survival by as much as 13%.
However, in recent years, there are signs that the interaction between fishermen and dolphins is declining due to the declining population of mullet and the waning interest in traditional culture. The research team expressed the view that in order to protect this culture, which is rare worldwide, it is necessary to identify the cause of the decrease in mullet and to take measures to protect the culture.
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