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. 2017 Jun 15;46(8):825–841. doi: 10.1007/s13280-017-0929-3

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — PCA biplot of element concentrations in the livers of immature and adult white-tailed eagles wintering in Eastern Poland. Convex hulls contain all samples representing a particular age category. Samples collected from adults and immatures are presented as points, and elements are presented as vectors