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. 2015 Jul 22;10(7):e0132324. doi: 10.1371/journal.pone.0132324

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Fig 8 — Differences among oiling/treatment classes (p < 0.01), years (p < 0.01), and the interaction of oiling/treatment class and year (p = 0.01) were observed. Specific oiling/treatment class differences were observed for reference versus all other classes, and manual treatment versus no treatment (all p < 0.01). Data are means ± 1 SE. N = 9 for the heavily oiled plots with no treatment; n = 5 for all other oiling/treatment classes including reference.