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. 2019 May 31;12:277. doi: 10.1186/s13071-019-3524-6

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© The Author(s) 2019

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Distance-based redundancy analysis of the number of parasites of Syacium gunteri and Syacium papillosum. The plot shows the statistical associations of the number of parasites for S. gunteri (red dots) and S. papillosum (blue dots) per sampling station and the environmental variables retained by the analysis after a forward stepwise procedure. The acronyms of the environmental variables are as follows: SSUMPAH, sum of the concentrations of polyaromatic hydrocarbons per sampling site; PO₄, phosphorus; NO₂, nitrite; SiO₄, silicate; Ni, nickel; Pb, lead; V, vanadium