气候变化领域集成服务门户(CCPortal): Diversity of ocean acidification effects on marine N2 fixers

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.834555
	Diversity of ocean acidification effects on marine N2 fixers
	Eichner; Meri; Rost; Bjoern; Kranz; Sven A
发布日期	2014-07-31
数据集类型	dataset
英文关键词	Bacteria ; Bottles or small containers/Aquaria ( 20 L) ; Calothrix rhizosoleniae ; Cyanobacteria ; Cyanothece sp. ; Growth/Morphology ; Laboratory experiment ; Laboratory strains ; Nodularia spumigena ; Not applicable ; Other metabolic rates ; Pelagos ; Phytoplankton ; Primary production/Photosynthesis ; Single species
英文简介	Considering the important role of N2 fixation for primary productivity and CO2 sequestration, it is crucial to assess the response of diazotrophs to ocean acidification. Previous studies on the genus Trichodesmium suggested a strong sensitivity towards ocean acidification. In view of the large functional diversity in N2 fixers, the objective of this study was to improve our knowledge of the CO2 responses of other diazotrophs. To this end, the single-celled Cyanothece sp. and two heterocystous species, Nodularia spumigena and the symbiotic Calothrix rhizosoleniae, were acclimated to two pCO2 levels (380 vs. 980 µatm). Growth rates, cellular composition (carbon, nitrogen and chlorophyll a) as well as carbon and N2 fixation rates (14C incorporation, acetylene reduction) were measured and compared to literature data on different N2 fixers. The three species investigated in this study responded differently to elevated pCO2, showing enhanced, decreased as well as unaltered growth and production rates. For instance, Cyanothece increased production rates with pCO2, which is in line with the general view that N2 fixers benefit from ocean acidification. Due to lowered growth and production of Nodularia, nitrogen input to the Baltic Sea might decrease in the future. In Calothrix, no significant changes in growth or production could be observed, even though N2 fixation was stimulated under elevated pCO2. Reviewing literature data confirmed a large variability in CO2 sensitivity across diazotrophs. The contrasting response patterns in our and previous studies were discussed with regard to the carbonate chemistry in the respective natural habitats, the mode of N2 fixation as well as differences in cellular energy limitation between the species. The group-specific CO2 sensitivities will impact differently on future biogeochemical cycles of open-ocean environments and systems like the Baltic Sea and should therefore be considered in models estimating climate feedback effects.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217391
推荐引用方式 GB/T 7714	Eichner,Meri,Rost,et al. Diversity of ocean acidification effects on marine N2 fixers.2014-07-31.https://doi.org/10.1594/PANGAEA.834555.