Dear MARMAM Subscribers, My co-authors and I are pleased to announce the following open access publication in *Scientific Reports*
Eisenmann, P.; Fry, B.; Mazumder, D.; Jacobsen, G.; Holyoake, C.; Coughran, D.; Bengtson Nash, S. M. (2017) Radiocarbon as a tracer of migration in southern hemisphere humpback whales. Scientific Reports, 7, 4366
The Article can be found at: *https://www.nature.com/articles/s41598-017-04698-2#Bib1 <https://www.nature.com/articles/s41598-017-04698-2#Bib1>*
*Abstract*
Bulk stable isotope analysis provides information regarding food web interactions, and has been applied to several cetacean species for the study of migration ecology. One limitation in bulk stable isotope analysis arises when a species, such as Southern hemisphere humpback whales, utilises geographically distinct food webs with differing isotopic baselines. Migrations to areas with different baselines can result in isotopic changes that mimic changes in feeding relations, leading to ambiguous food web interpretations. Here, we demonstrate the novel application of radiocarbon measurement for the resolution of such ambiguities. Radiocarbon was measured in baleen plates from humpback whales stranded in Australia between 2007 and 2013, and in skin samples collected in Australia and Antarctica from stranded and free- ranging animals. Radiocarbon measurements showed lower values for Southern Ocean feeding than for extra-Antarctic feeding in Australian waters. While the whales mostly relied on Antarctic-derived energy stores during their annual migration, there was some evidence of feeding within temperate zone waters in some individuals. This work, to our knowledge, provides the first definitive biochemical evidence for supplementary feeding by southern hemisphere humpback whales within temperate waters during migration. Further, the work contributes a powerful new tool (radiocarbon) for tracing source regions and geographical feeding.
If you have any questions, please email;
pascale.eisenmann@griffithuni.edu.au or *s.bengtsonnash@griffith.edu.au <s.bengtsonnash@griffith.edu.au>*
Kind regards,
*Associate Professor Susan Bengtson Nash*
Program Director
*Southern Ocean Persistent Organic Pollutants Program (SOPOPP)* Environmental Futures Research Institute (EFRI), Griffith University, Nathan Campus. 170 Kessels Road, Nathan QLD 4111 Australia.
*Email*: s.bengtsonnash@griffith.edu.au *Phone*: +61 (0)7 3735 5062 *Mobile*: +61 (0)437 888 711
*Twitter: *@Antarctica_POPs; *Skype:* s.bengtsonnash; *Website*: http://www.griffith.edu.au/environment-planning- architecture/southern-ocean-persistent-organic-pollutants-program