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(A) Mean (±1 SE) of nitrogen content (%) and (B) δ15N (%) of Aechmea mertensii leaves (filled circles), root-embedded carton-nest (grey square) and phytotelmata leaf litter (empty triangle) for Camponotus femoratus (N = 10), Pachycondyla goeldii (N = 10) and non-occupied (N = 5) AGs.
