Hi everyone! My name is Alejandra Brito, I'm a marine biology student in Perú. I'm thinking in doing my thesis in Humpback whales, using stable isotopes to assess their diet. Does anyone has information about studies on carbon and nitrogen isotopes on skin samples of humpback whale in breeding season? And if someone has information about techniques and prosecution of skin samples, I would be very grateful! I know humpback whales are supose not to feed on breeding season, but probably someone has evaluated a possible diet at that season. If anyone can help me with this, you can e-mail me at: alebritogs@gmail.com Thanks!