Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper

<p>Dense blooms of filamentous diazotrophic cyanobacteria are formed every summer in the Baltic Sea. These autotrophic organisms may bypass nitrogen limitation by performing nitrogen fixation, which also governs surrounding organisms by increasing bioavailable nitrogen. The magnitude of the ni...

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Autores principales:	J. Hieronymus, K. Eilola, M. Olofsson, I. Hense, H. E. M. Meier, E. Almroth-Rosell
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/2227c5d353c844a39567e8e4283902ba
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spelling	oai:doaj.org-article:2227c5d353c844a39567e8e4283902ba2021-12-01T10:53:15ZModeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper10.5194/bg-18-6213-20211726-41701726-4189https://doaj.org/article/2227c5d353c844a39567e8e4283902ba2021-12-01T00:00:00Zhttps://bg.copernicus.org/articles/18/6213/2021/bg-18-6213-2021.pdfhttps://doaj.org/toc/1726-4170https://doaj.org/toc/1726-4189<p>Dense blooms of filamentous diazotrophic cyanobacteria are formed every summer in the Baltic Sea. These autotrophic organisms may bypass nitrogen limitation by performing nitrogen fixation, which also governs surrounding organisms by increasing bioavailable nitrogen. The magnitude of the nitrogen fixation is important to estimate from a management perspective since this might counteract eutrophication reduction measures. Here, a cyanobacteria life cycle model has been implemented for the first time in a high-resolution 3D coupled physical and biogeochemical model of the Baltic Sea, spanning the years 1850–2008. The explicit consideration of life cycle dynamics and transitions significantly improves the representation of the cyanobacterial phenological patterns compared to earlier 3D modeling efforts. Now, the rapid increase and decrease in cyanobacteria in the Baltic Sea are well captured, and the seasonal timing is in concert with observations. The current improvement also had a large effect on the nitrogen fixation load and is now in agreement with estimates based on in situ measurements. By performing four phosphorus sensitivity runs, we demonstrate the importance of both organic and inorganic phosphorus availability for historical cyanobacterial biomass estimates. The model combination can be used to continuously predict internal nitrogen loads via nitrogen fixation in Baltic Sea ecosystem management, which is of extra importance in a future ocean with changed conditions for the filamentous cyanobacteria.</p>J. HieronymusK. EilolaM. OlofssonM. OlofssonI. HenseH. E. M. MeierH. E. M. MeierE. Almroth-RosellCopernicus PublicationsarticleEcologyQH540-549.5LifeQH501-531GeologyQE1-996.5ENBiogeosciences, Vol 18, Pp 6213-6227 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
spellingShingle	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. Hieronymus K. Eilola M. Olofsson M. Olofsson I. Hense H. E. M. Meier H. E. M. Meier E. Almroth-Rosell Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
description	<p>Dense blooms of filamentous diazotrophic cyanobacteria are formed every summer in the Baltic Sea. These autotrophic organisms may bypass nitrogen limitation by performing nitrogen fixation, which also governs surrounding organisms by increasing bioavailable nitrogen. The magnitude of the nitrogen fixation is important to estimate from a management perspective since this might counteract eutrophication reduction measures. Here, a cyanobacteria life cycle model has been implemented for the first time in a high-resolution 3D coupled physical and biogeochemical model of the Baltic Sea, spanning the years 1850–2008. The explicit consideration of life cycle dynamics and transitions significantly improves the representation of the cyanobacterial phenological patterns compared to earlier 3D modeling efforts. Now, the rapid increase and decrease in cyanobacteria in the Baltic Sea are well captured, and the seasonal timing is in concert with observations. The current improvement also had a large effect on the nitrogen fixation load and is now in agreement with estimates based on in situ measurements. By performing four phosphorus sensitivity runs, we demonstrate the importance of both organic and inorganic phosphorus availability for historical cyanobacterial biomass estimates. The model combination can be used to continuously predict internal nitrogen loads via nitrogen fixation in Baltic Sea ecosystem management, which is of extra importance in a future ocean with changed conditions for the filamentous cyanobacteria.</p>
format	article
author	J. Hieronymus K. Eilola M. Olofsson M. Olofsson I. Hense H. E. M. Meier H. E. M. Meier E. Almroth-Rosell
author_facet	J. Hieronymus K. Eilola M. Olofsson M. Olofsson I. Hense H. E. M. Meier H. E. M. Meier E. Almroth-Rosell
author_sort	J. Hieronymus
title	Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
title_short	Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
title_full	Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
title_fullStr	Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
title_full_unstemmed	Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
title_sort	modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the baltic proper
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/2227c5d353c844a39567e8e4283902ba
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Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper

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