Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.

Thawing permafrost in the Canadian Arctic tundra leads to peat erosion and slumping in narrow and shallow runnel ponds that surround more commonly studied polygonal ponds. Here we compared the methane production between runnel and polygonal ponds using stable isotope ratios, ¹⁴C signatures, and inve...

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Autores principales:	Karita Negandhi, Isabelle Laurion, Michael J Whiticar, Pierre E Galand, Xiaomei Xu, Connie Lovejoy
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/540084efb2cc4e8b884468e86fafbb5c
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spelling	oai:doaj.org-article:540084efb2cc4e8b884468e86fafbb5c2021-11-18T08:46:57ZSmall thaw ponds: an unaccounted source of methane in the Canadian high Arctic.1932-620310.1371/journal.pone.0078204https://doaj.org/article/540084efb2cc4e8b884468e86fafbb5c2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24236014/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Thawing permafrost in the Canadian Arctic tundra leads to peat erosion and slumping in narrow and shallow runnel ponds that surround more commonly studied polygonal ponds. Here we compared the methane production between runnel and polygonal ponds using stable isotope ratios, ¹⁴C signatures, and investigated potential methanogenic communities through high-throughput sequencing archaeal 16S rRNA genes. We found that runnel ponds had significantly higher methane and carbon dioxide emissions, produced from a slightly larger fraction of old carbon, compared to polygonal ponds. The methane stable isotopic signature indicated production through acetoclastic methanogenesis, but gene signatures from acetoclastic and hydrogenotrophic methanogenic Archaea were detected in both polygonal and runnel ponds. We conclude that runnel ponds represent a source of methane from potentially older C, and that they contain methanogenic communities able to use diverse sources of carbon, increasing the risk of augmented methane release under a warmer climate.Karita NegandhiIsabelle LaurionMichael J WhiticarPierre E GalandXiaomei XuConnie LovejoyPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 11, p e78204 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Karita Negandhi Isabelle Laurion Michael J Whiticar Pierre E Galand Xiaomei Xu Connie Lovejoy Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
description	Thawing permafrost in the Canadian Arctic tundra leads to peat erosion and slumping in narrow and shallow runnel ponds that surround more commonly studied polygonal ponds. Here we compared the methane production between runnel and polygonal ponds using stable isotope ratios, ¹⁴C signatures, and investigated potential methanogenic communities through high-throughput sequencing archaeal 16S rRNA genes. We found that runnel ponds had significantly higher methane and carbon dioxide emissions, produced from a slightly larger fraction of old carbon, compared to polygonal ponds. The methane stable isotopic signature indicated production through acetoclastic methanogenesis, but gene signatures from acetoclastic and hydrogenotrophic methanogenic Archaea were detected in both polygonal and runnel ponds. We conclude that runnel ponds represent a source of methane from potentially older C, and that they contain methanogenic communities able to use diverse sources of carbon, increasing the risk of augmented methane release under a warmer climate.
format	article
author	Karita Negandhi Isabelle Laurion Michael J Whiticar Pierre E Galand Xiaomei Xu Connie Lovejoy
author_facet	Karita Negandhi Isabelle Laurion Michael J Whiticar Pierre E Galand Xiaomei Xu Connie Lovejoy
author_sort	Karita Negandhi
title	Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
title_short	Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
title_full	Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
title_fullStr	Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
title_full_unstemmed	Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
title_sort	small thaw ponds: an unaccounted source of methane in the canadian high arctic.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/540084efb2cc4e8b884468e86fafbb5c
work_keys_str_mv	AT karitanegandhi smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic AT isabellelaurion smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic AT michaeljwhiticar smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic AT pierreegaland smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic AT xiaomeixu smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic AT connielovejoy smallthawpondsanunaccountedsourceofmethaneinthecanadianhigharctic
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Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.

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