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. 2015 Dec 16;10(12):e0144066. doi: 10.1371/journal.pone.0144066

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 2 — Each data point on the PCO plot represents the average annual diet composition of juvenile Chinook salmon for May and June. The vectors show the direction and relative strength of the environmental variables examined and the circle represents equilibrium.