Humpback whale song occurrence reflects ecosystem variability in feeding and migratory habitat of the northeast Pacific. oleh John P Ryan, Danelle E Cline, John E Joseph, Tetyana Margolina, Jarrod A Santora, Raphael M Kudela, Francisco P Chavez, J Timothy Pennington, Christopher Wahl, Reiko Michisaki, Kelly Benoit-Bird, Karin A Forney, Alison K Stimpert, Andrew DeVogelaere, Nancy Black, Mark Fischer