In July 2015, MML scientists encountered the T100s and successfully satellite tagged T100C (an adult male). The T100s had been previously tagged in Puget Sound in 2010, but the tags only provided locations for about two weeks thus data on the overall movements/range of these whales were limited. Encountering them in July 2015 in Port Frederick, Southeast Alaska, represented a unique opportunity to learn more about their movements, overall range, and prey selection. Tags used were Spot5 satellite-linked transmitters in the Low-impact Minimally Percutaneous External-electronics Transmitter (LIMPET) configuration. Tags were remotely deployed and attached to the dorsal fin. When encountered, this group of whales had just killed a harbor porpoise, from which we were able to collect porpoise tissue samples that will be extremely important for studies of stock structure on harbor porpoises in Southeast Alaska. Another predation event occurred later during our July field season and we once again were able to collect another harbor porpoise tissue sample from this second kill.
During the approximate month-long duration of this tag deployment, the whales spent the first couple of weeks in northern Southeast Alaska primarily targeting harbor porpoise and harbor seals. As they moved southward they spent time at three or possibly four Steller sea lions rookeries. The T100s are currently reported in the Strait of Georgia (see map above).
Our collaborative research project also includes follow up studies of tagged whales; an opportunity that is unique to the inland waters from Southeast Alaska to Puget Sound, Washington (i.e., allowing us to re-encounter known tagged whales). Photographs of previous tagged whales are collected to evaluate wound healing. This research is conducted under a permit issued to the National Marine Fisheries Service (both MML and NWFSC) in addition to being reviewed through IACUC.
- Killer Whale Research in Alaska
- 2017 Alaska Marine Mammal Stock Assessments
- Passive Acoustic Monitoring of Marine Mammals in Alaska
- Investigating the Foraging and Diving Behavior of "Transient"- Type Killer Whales in the Central and Western Aleutians