April 11, 2019
Shark cameras reveal unexpected white shark behavior
Despite being well-known to the public, white sharks are still somewhat of a mystery to scientists. For example, previous research suggested that white sharks prefer open water and rarely venture into kelp forests. But new research using an MBARI-inspired “camera tag” shows that some sharks in South Africa spend a lot of time in kelp beds where they may even be hunting for seals.
Since 2015, engineers at MBARI and researchers at the Monterey Bay Aquarium have been working together to develop an open-source video camera tag that would allow researchers to observe the behavior of these large predators directly in their natural marine environment. Designed and tested primarily on white sharks, the innovative instrument offers a glimpse into the sometimes mystifying lives of these oceanic predators by collecting video footage that provides a “shark’s-eye-view” of the ocean.
Researchers in South Africa used a video tagging technology called “animal-borne video and environmental data collection system,” which has features inspired by MBARI’s Shark Café Cam. Using this system, they made a surprising discovery about white shark behavior, which they describe in a recent article in Biology Letters.
Observations of white shark foraging behavior show they generally surprise their prey and swim up from below to attack animals like seals and sea lions at the ocean surface. The study published this month, however, suggests that white sharks may exhibit a different hunting strategy in a habitat that was once considered off limits to these large predators—the kelp forest.
The authors point out that, “This is the first study, to our knowledge, to document extensive and repeated use of kelp forests by white sharks and to describe predator-prey interactions within this habitat.”
The discovery shows how innovative technology developed at MBARI can help scientists around the world gain new perspectives on the ocean and its inhabitants. “Our findings demonstrate the power of animal-borne video to improve our understanding of the habitat use of large marine predators and reveal interactions within the marine environment that would have remained hidden with conventional telemetry systems.”
Article by Cassandra Burrier
Original journal article:
Jewell, O.J.D., Gleiss, A.C., Jorgensen, S.J., Andrzejaczek, S., Moxley, J.H., Beatty, S.J.,Wikelski, M., Block, B.A.,and Chapple, T.K. (2019). “Cryptic habitat use of white sharks in kelp forest revealed by animal-borne video” Biology Letters, 15, 4, doi 10.1098/rsbl.2019.0085 (3 April 2019)
View a video about MBARI’s work with the Monterey Bay Aquarium to develop a shark-cam tag:
For additional information or images relating to this article, please contact: Kim Fulton-Bennett