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Photoautotrophs are generally considered to be the base of food webs, and habitats that lack light, such as caves, frequently rely on surface-derived carbon. Here we show, based on analysis of gut contents and stable isotope ratios of tissues ( 13 C: 12 C and 15 N: 14 N), that sulfur-oxidizing bacteria are directly consumed and assimilated by the fish Poecilia mexicana in a sulfide-rich cave stream in Tabasco state, Mexico. Our results provide evidence of a vertebrate deriving most of its organic carbon and nitrogen from in situ chemoautotrophic production, and reveals the importance of alternative energy production sources supporting animals in extreme environments.
Ecology – Ecological Society of America
Published: Nov 1, 2011
Keywords: Key words : cave fish ; chemoautotroph ; food web ; hydrogen sulfide ; Poecilia mexicana ; production source .
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