Cutting-edge cameras reveal the secret life of dolphins
A world-first study testing new underwater cameras on wild dolphins has given researchers the best view yet into their hidden marine world.
A research team including experts from the University of Sydney鈥檚聽聽and the University of Alaska Southeast trialled the custom-made non-invasive cameras to capture and analyse more than 535 minutes of such rarely-seen activities as mother-calf interaction, playing with kelp, and intimate social behaviours such as flipper-rubbing. The results are published in the latest聽.
鈥淔or the first time, these cameras have given us the opportunity to see what dolphins do on their own terms,鈥� said聽聽from the University of Sydney鈥檚聽聽and Charles Perkins Centre.
鈥淭here were no wildlife crews, no invasive underwater housings 鈥� and the dolphins remained largely unaffected by our cameras. This research opens up a whole new approach for capturing wild animal behaviour, which will ultimately help us to not only advance conservation efforts but also come closer to understanding wild predators鈥� and human nutrition too.鈥�
The successful deployment advances new approaches to filming wild sea creatures, aiding conservation and rehabilitation efforts and giving researchers unprecedented insight into wild dolphins鈥� prey and habitats.
鈥淒olphins are marine top predators that are considered biomonitors of marine environments, so gaining a better understanding of their lives will help us to better comprehend the health of marine environments including prey species like fish and squid that are highly consumed by humans,鈥� said Dr Machovsky-Capuska, who is also co-leader of the聽聽research node at the Charles Perkin Centre.
For the first time, these cameras have given us the opportunity to see what dolphins do on their own terms.
The cameras were attached via suction cups to eight wild dusky dolphins, deployed using a long pole with the aid of Velcro pads. The footage was captured off the coast of New Zealand from December 2015 to January 2016, with each camera system loaded with memory boards, very high frequency and satellite transmitters, time depth recorders and having a battery life of six hours.
鈥淥ne challenge of doing this research on small and fast animals like dusky dolphins is that there is limited surface area on the dolphin鈥檚 body for tag attachment, so there鈥檚 only a small window of time to actually deploy the tag as the dolphin swims past,鈥� said Dr Peter Jones from the University of Sydney鈥檚聽.
鈥淲e have much to learn about animal behaviour and systems such as this are a great way to observe their activity in a natural environment with the least likely influence on that behaviour.鈥�
Dolphin specialist聽, Assistant Professor of Marine Biology at the University of Alaska Southeast, said the research has great potential for protecting endangered species by giving scientists a much higher resolution of information than is possible than with other methods.
鈥淔rom the surface, researchers can only see about 10 percent of what is going on in an animal鈥檚 life. With these video cameras, we can 鈥榮ee鈥� from the animals鈥� perspective and begin to understand the challenges they face as they move throughout their habitat,鈥� she said.
鈥淔or example, in marine areas subjected to high degrees of human disturbance such as shipping or coastal development, the ability to collect data from the animal鈥檚 perspective will be critical in understanding how and to what extent these stressors affect an animal鈥檚 ability to feed, mate, and raise young.鈥�
The researchers now hope to further develop the cameras to test with marine predators including other cetacean species and sharks.
The research was funded by the National Geographic Society Waitt Grant Fund and the Encounter Foundation (Kaikoura, New Zealand) and included the New Zealand Department of Conservation, Massey University (New Zealand) and the National Oceanic and Atmospheric Administration (US) as project partners.聽
Image above: Chris Pearson, DOC permit 37696-MAR