The Canadian Broadcasting Corporation (CBC) Interviews MMTD Director Lisa Ballance

Lisa Ballance was interviewed by Bob McDonald for the Canadian Broadcasting Corporation's radio show “Quirks & Quarks” about recently published research (see abstract below). The interview was broadcast on Saturday January 24; the complete interview can be heard at: http://www.cbc.ca/radio/quirks/quirks-quarks-for-jan-24-2015-1.2929746/killer-whales-kill-humpbacks-1.2929973. The previous link is a link to non-Federal government web site. Click to review NOAA Fisheries disclaimer For additional details, contact Lisa.Ballance@noaa.gov or Robert.Pitman@noaa.gov.

Pitman, R.L., J.A. Totterdell, H. Fearnbach, L.T. Ballance, J.W. Durban, and H. Kemps. 2014. Whale killers: Prevalence and ecological implications of killer whale predation on humpback whale calves off Western Australia. Marine Mammal Science DOI: 10.1111/mms.12182

Abstract - Reports of killer whales (Orcinus orca) preying on large whales have been relatively rare, and the ecological significance of these attacks is controversial. Here we report on numerous observations of killer whales preying on neonate humpback whales (Megaptera novaeangliae) off Western Australia (WA) based on reports we compiled and our own observations. Attacking killer whales included at least 19 individuals from three stable social groupings in a highly connected local population; 22 separate attacks with known outcomes resulted in at least 14 (64%) kills of humpback calves. We satellite-tagged an adult female killer whale and followed her group on the water for 20.3 h over six separate days. During that time, they attacked eight humpback calves, and from the seven known outcomes, at least three calves (43%) were killed. Overall, our observations suggest that humpback calves are a predictable, plentiful, and readily taken prey source for killer whales and scavenging sharks off WA for at least 5 mo/yr. Humpback “escorts” vigorously assisted mothers in protecting their calves from attacking killer whales (and a white shark, Carcharodon carcharias). This expands the purported role of escorts in humpback whale social interactions, although it is not clear how this behavior is adaptive for the escorts.