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. 2017 May 23;5:e3364. doi: 10.7717/peerj.3364

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© 2017 Karasiewicz et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Overall, dashed black line, R² = 0.64 with P < 0.001; upstream, grey line, R² = 0.68 with P < 0.001; downstream, plain black line, R² = 0.21 with P = 0.034.