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Goffredi SK, Jang GE, Woodside WT, et al. Bromeliad catchments as habitats for methanogenesis in tropical rainforest canopies. Front Microbiol. 2011;2:256doi: 10.3389/fmicb.2011.00256.
Goffredi, S. K., Jang, G. E., Woodside, W. T., & Ussler, W. (2011). Bromeliad catchments as habitats for methanogenesis in tropical rainforest canopies. Frontiers in microbiology, 2256. https://doi.org/10.3389/fmicb.2011.00256
Goffredi, Shana K, et al. "Bromeliad catchments as habitats for methanogenesis in tropical rainforest canopies." Frontiers in microbiology vol. 2 (2011): 256. doi: https://doi.org/10.3389/fmicb.2011.00256
Goffredi SK, Jang GE, Woodside WT, Ussler W. Bromeliad catchments as habitats for methanogenesis in tropical rainforest canopies. Front Microbiol. 2011 Dec 27;2:256. doi: 10.3389/fmicb.2011.00256. eCollection 2011. PMID: 22207867; PMCID: PMC3246357.
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Front Microbiol. 2011 Dec 27;2:256. doi: 10.3389/fmicb.2011.00256. eCollection 2011.

Bromeliad catchments as habitats for methanogenesis in tropical rainforest canopies.

Frontiers in microbiology

Shana K Goffredi, Gene E Jang, Walter T Woodside, William Ussler

Affiliations

  1. Biology Department, Occidental College Los Angeles, CA, USA.

PMID: 22207867 PMCID: PMC3246357 DOI: 10.3389/fmicb.2011.00256

Abstract

Tropical epiphytic plants within the family Bromeliaceae are unusual in that they possess foliage capable of retaining water and impounded material. This creates an acidic (pH 3.5-6.5) and anaerobic (<1 ppm O(2)) environment suspended in the canopy. Results from a Costa Rican rainforest show that most bromeliads (n = 75/86) greater than ~20 cm in plant height or ~4-5 cm tank depth, showed presence of methanogens within the lower anoxic horizon of the tank. Archaea were dominated by methanogens (77-90% of recovered ribotypes) and community structure, although variable, was generally comprised of a single type, closely related to either hydrogenotrophic Methanoregula or Methanocella, a specific clade of aceticlastic Methanosaeta, or Methanosarcina. Juvenile bromeliads, or those species, such as Guzmania, with shallow tanks, generally did not possess methanogens, as assayed by polymerase chain reaction specific for methanogen 16S rRNA genes, nor did artificial catchments (~100 ml volume), in place 6-12 months prior to sample collection. Methanogens were not detected in soil (n = 20), except in one case, in which the dominant ribotype was different from nearby bromeliads. Recovery of methyl coenzyme M reductase genes supported the occurrence of hydrogenotrophic and aceticlastic methanogens within bromeliad tanks, as well as the trend, via QPCR analysis of mcrA, of increased methanogenic capacity with increased plant height. Methane production rates of up to 300 nmol CH(4) ml tank water(-1) day(-1) were measured in microcosm experiments. These results suggest that bromeliad-associated archaeal communities may play an important role in the cycling of carbon in neotropical forests.

Keywords: Methanoregula; Methanosaeta; bromeliad; hydrogenotrophic; methane; methanogen; rainforest

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