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Methane- and dissolved organic carbon-fueled microbial loop supports a tropical subterranean estuary ecosystem

Brankovits, D. and Pohlman, J. W. and Niemann, H. and Leigh, M. B. and Leewis, M. C. and Becker, K. W. and Iliffe, T. M. and Alvarez, F. and Lehmann, M. F. and Phillips, B.. (2017) Methane- and dissolved organic carbon-fueled microbial loop supports a tropical subterranean estuary ecosystem. Nature Communications, 8. p. 1835.

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Abstract

Subterranean estuaries extend inland into density-stratified coastal carbonate aquifers containing a surprising diversity of endemic animals (mostly crustaceans) within a highly oligotrophic habitat. How complex ecosystems (termed anchialine) thrive in this globally distributed, cryptic environment is poorly understood. Here, we demonstrate that a microbial loop shuttles methane and dissolved organic carbon (DOC) to higher trophic levels of the anchialine food web in the Yucatan Peninsula (Mexico). Methane and DOC production and consumption within the coastal groundwater correspond with a microbial community capable of methanotrophy, heterotrophy, and chemoautotrophy, based on characterization by 16S rRNA gene amplicon sequencing and respiratory quinone composition. Fatty acid and bulk stable carbon isotope values of cave-adapted shrimp suggest that carbon from methanotrophic bacteria comprises 21% of their diet, on average. These findings reveal a heretofore unrecognized subterranean methane sink and contribute to our understanding of the carbon cycle and ecosystem function of karst subterranean estuaries.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Umweltgeowissenschaften > Geochemie Stoffkreisläufe (Lehmann)
UniBasel Contributors:Lehmann, Moritz F and Niemann, Helge
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
ISSN: 2041-1723
e-ISSN:2041-1723
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:28 May 2018 15:21
Deposited On:28 May 2018 15:21

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