AUTHORSHIP
J.M., I.T., and Y.O. conceived this study; K.T., A.Y., K.S., K.H., H.M.,
and S.N. provided copepod samples and contextual information; J.M. and
T.N. provided chum salmon samples and contextual information; J.M.
performed sectioning of salmon vertebrae and collagen extraction from
bone samples; J.M., N.O.O., N. F. I., N.O., and I.T. performed bulk and
compound-specific stable nitrogen isotope analysis; C.Y provided data
for nitrate utilization and phytoplankton stable nitrogen isotope ratios
in the North Pacific; Y.O. developed a statistical model to estimate
salmon migration routes; J.M., Y.O., and C.Y. wrote the first draft of
the paper; all authors were involved in interpreting the results and
contributed to the final draft of the paper; J.M. and Y.O. contributed
equally to this work.