Auxiliary material for this article contains consists of one text file containing a detailed description of the study regions, and two tables. The first table (S1) gives the detailed results from the regression analysis shown in Figure 4. The second table (S2) gives details of the end-member values used in the mixing model analysis.

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Additional file information is provided in the readme.txt.

gbc1923-sup-0001-readme.txtplain text document0Kreadme.txt
gbc1923-sup-0002-txts01.txtplain text document0KText S1. A detailed description of the four study regions from which data were obtained.
gbc1923-sup-0003-ts01.txtplain text document0KTable S1. Results of the regression analyses shown in Figure 4.
gbc1923-sup-0004-ts02.txtplain text document0KTable S2. End-member values used for the mixing model analysis, as described in the main text.
gbc1923-sup-0005-t01.txtplain text document1KTab-delimited Table 1.
gbc1923-sup-0006-t02.txtplain text document1KTab-delimited Table 2.
gbc1923-sup-0007-t03.txtplain text document1KTab-delimited Table 3.
gbc1923-sup-0008-t04.txtplain text document1KTab-delimited Table 4.
gbc1923-sup-0009-t05.txtplain text document1KTab-delimited Table 5.

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