Dear all, On behalf of my co-authors, I am excited to announce the publication of our manuscript titled "Genetic Evidence of Killer Whale Predation on White Sharks in Australia" in Ecology and Evolution. Abstract: Killer whales (Orcinus orca) have been documented to prey on white sharks (Carcharodon carcharias), in some cases causing localised shark displacement and triggering ecological cascades. Notably, a series of such predation events have been reported from South Africa over the last decade, with killer whales specifically targeting sharks' liver. However, observations of these interactions are rare, and knowledge of their frequency across the world's oceans remains limited. In October 2023, a 4.7 m (total length) white shark carcass washed ashore in southeastern Australia, coinciding with reports from citizen scientists of killer whales hunting a large, unidentified prey item in the area. Visual inspection of the carcass revealed that the liver, digestive, and reproductive organs were missing, and the presence of four distinctive bite wounds, one of which was characteristic of killer whale liver extraction as seen in South Africa. Genomic analyses performed on swabs taken from the bite wounds confirmed the presence of killer whale DNA in the major bite area, while the other bites were embedded with genetic material from the scavenging broadnose sevengill shark (Notorynchus cepedianus). These results provide confirmed evidence of killer whale predation on white sharks in Australia and the likely selective consumption of the liver, suggesting predations of this nature are more globally prevalent than currently assumed. For full details, please see the article, available via open access here<https://onlinelibrary.wiley.com/doi/10.1002/ece3.70786>. Kind regards, Isabella Isabella Reeves (she/her) PhD Candidate BSc Marine Biology (Hons.) Cetacean Research Centre, WA Southern Shark Ecology Group College of Science & Engineering, Flinders University Email<mailto:isabella.reeves@flinders.edu.au> | Twitter<https://twitter.com/bellaa_reeves> | LinkedIn<https://www.linkedin.com/in/isabella-reeves-60142b175/> [cid:d637bbb6-36c3-4883-9a2a-6cd4d416a90e][cid:c2022117-0b87-441b-9379-28f47c4f3c6a] I acknowledge the Kaurna people, the Traditional Custodians of the land I am fortunate to live on. I pay respect to elders past, present and emerging, and recognise the continuing connection to the land, water, culture and community of First Nations people here and across Australia. CRICOS No: 00114A This email and any attachments may be confidential. If you are not the intended recipient, please inform the sender by reply email and delete all copies of this message.
