Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates

Abstract The southeastern Mediterranean Sea (SEMS) is a warm and sunlit marine environment with low ambient N concentration, thus considered ideal for diazotrophy by autotrophic diazotrophs such as Trichodesmium. Despite the favorable conditions, N2 fixation rates are often low and Trichodesmium has...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Eyal Rahav, Edo Bar-Zeev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/291884fd722f40e18c2d67475e960f8f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:291884fd722f40e18c2d67475e960f8f
record_format	dspace
spelling	oai:doaj.org-article:291884fd722f40e18c2d67475e960f8f2021-12-02T15:06:03ZSewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates10.1038/s41598-017-04622-82045-2322https://doaj.org/article/291884fd722f40e18c2d67475e960f8f2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04622-8https://doaj.org/toc/2045-2322Abstract The southeastern Mediterranean Sea (SEMS) is a warm and sunlit marine environment with low ambient N concentration, thus considered ideal for diazotrophy by autotrophic diazotrophs such as Trichodesmium. Despite the favorable conditions, N2 fixation rates are often low and Trichodesmium has hardly been spotted in the SEMS. This study reports on the occurrence of a Trichodesmium bloom in the SEMS which was ascribed to T. erythraeum according to DNA fingerprinting of the nifH gene. We found that this bloom (1407 ± 983 cells L−1) was triggered by an intense outburst of raw sewage that supplied high concentrations of N, P and dissolved organic carbon (DOC), which resulted in low N:P (~12:1) and exceptionally high C:P (~1340:1) ratios. We surmise that these conditions provided favorable conditions for Trichodesmium bloom to form via mixotrophic metabolism. As a result, a fourfold increase in N2 fixation was recorded, which contributed ~70% to new primary production and spur a sharp increase in phytoplankton activity and biomass. The conclusions of this study point on a new paradigm for bloom-forming T. erythraeum which is tightly linked to anthropogenic sources and prompt microbial productivity in oligotrophic marine environments such as the SEMS.Eyal RahavEdo Bar-ZeevNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eyal Rahav Edo Bar-Zeev Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
description	Abstract The southeastern Mediterranean Sea (SEMS) is a warm and sunlit marine environment with low ambient N concentration, thus considered ideal for diazotrophy by autotrophic diazotrophs such as Trichodesmium. Despite the favorable conditions, N2 fixation rates are often low and Trichodesmium has hardly been spotted in the SEMS. This study reports on the occurrence of a Trichodesmium bloom in the SEMS which was ascribed to T. erythraeum according to DNA fingerprinting of the nifH gene. We found that this bloom (1407 ± 983 cells L−1) was triggered by an intense outburst of raw sewage that supplied high concentrations of N, P and dissolved organic carbon (DOC), which resulted in low N:P (~12:1) and exceptionally high C:P (~1340:1) ratios. We surmise that these conditions provided favorable conditions for Trichodesmium bloom to form via mixotrophic metabolism. As a result, a fourfold increase in N2 fixation was recorded, which contributed ~70% to new primary production and spur a sharp increase in phytoplankton activity and biomass. The conclusions of this study point on a new paradigm for bloom-forming T. erythraeum which is tightly linked to anthropogenic sources and prompt microbial productivity in oligotrophic marine environments such as the SEMS.
format	article
author	Eyal Rahav Edo Bar-Zeev
author_facet	Eyal Rahav Edo Bar-Zeev
author_sort	Eyal Rahav
title	Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
title_short	Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
title_full	Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
title_fullStr	Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
title_full_unstemmed	Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates
title_sort	sewage outburst triggers trichodesmium bloom and enhance n2 fixation rates
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/291884fd722f40e18c2d67475e960f8f
work_keys_str_mv	AT eyalrahav sewageoutbursttriggerstrichodesmiumbloomandenhancen2fixationrates AT edobarzeev sewageoutbursttriggerstrichodesmiumbloomandenhancen2fixationrates
_version_	1718388567435116544

Sewage outburst triggers Trichodesmium bloom and enhance N2 fixation rates

Ejemplares similares