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Differences in soil and plant tissue stable isotope values (means ± 1 SE) measured in Cocos-dominated forests (open) and Pisonia grandis and Tournefortia argentea (PT) dominated forests (solid black). Enriched δ15N values in PT forests are more similar to δ15N of bird guano than marine wash (both gray), indicating that birds are major vectors of nutrient subsidies into these forests. SE bars are depicted for all sample types, but are not visible in some cases because of scaling.
