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Figure 6.

Cuban river water data in context. (A) Cuban waters contain greater dissolved concentrations for most elements or ions than other Caribbean islands (Rad et al., 2013). (B) Chemical weathering rates (cations, anions, and Si) in rivers sampled in central Cuba, Dominica, Guadeloupe, and Martinique (Rad et al., 2013) are high and similar (cf. global from Larsen et al. [2014]; n = 299). Note log scale. Median is middle line, the 25th and 75th percentiles are the edges, and whiskers extend to include all samples within 1.5 times the range of the box. (C) Total dissolved nitrogen (TDN) for Mississippi River at Baton Rouge (water.usgs.gov) compared to central Cuban rivers (this paper). (D) Cuban fertilizer use (P, K, N) normalized by arable land area is stable and less than other nations. Data from https://data.worldbank.org/indicator/, Rawlins et al. (1998), and https://www.epa.gov/roe/.

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