In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis

doi:10.1007/s11430-009-0141-9

	In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis
	Sun Song1 ; Pu XinMing 1,2; Zhang YongShan 1
	2009-09-01
发表期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN	1006-9313
卷号	52 期号:9 页码:1426-1435
文章类型	Article
摘要	In "high nitrate, low chlorophyll" (HNLC) ocean regions, iron has been typically regarded as the limiting factor for phytoplankton production. This "iron hypothesis" needs to be tested in various oceanic environments to understand the role of iron in marine biological and biogeochemical processes. In this paper, three in vitro iron enrichment experiments were performed in Prydz Bay and at the Polar Front north of the Ross Sea, to study the role of iron on phytoplankton production. At the Polar Front of Ross Sea, iron addition significantly (P < 0.05, Student's t-test) stimulated phytoplankton growth. In Prydz Bay, however, both the iron treatments and the controls showed rapid phytoplankton growth, and no significant effect (P > 0.05, Student's t-test) as a consequence of iron addition was observed. These results confirmed the limiting role of iron in the Ross Sea and indicated that iron was not the primary factor limiting phytoplankton growth in Prydz Bay. Because the light environment for phytoplankton was enhanced in experimental bottles, light was assumed to be responsible for the rapid growth of phytoplankton in all treatments and to be the limiting factor controlling field phytoplankton growth in Prydz Bay. During the incubation experiments, nutrient consumption ratios also changed with the physiological status and the growth phases of phytoplankton cells. When phytoplankton growth was stimulated by iron addition, N was the first and Si was the last nutrient which absorption enhanced. The Si/N and Si/P consumption ratios of phytoplankton in the stationary and decay phases were significantly higher than those of rapidly growing phytoplankton. These findings were helpful for studies of the marine ecosystem and biogeochemistry in Prydz Bay, and were also valuable for biogeochemical studies of carbon and nutrients in various marine environments.; In "high nitrate, low chlorophyll" (HNLC) ocean regions, iron has been typically regarded as the limiting factor for phytoplankton production. This "iron hypothesis" needs to be tested in various oceanic environments to understand the role of iron in marine biological and biogeochemical processes. In this paper, three in vitro iron enrichment experiments were performed in Prydz Bay and at the Polar Front north of the Ross Sea, to study the role of iron on phytoplankton production. At the Polar Front of Ross Sea, iron addition significantly (P < 0.05, Student's t-test) stimulated phytoplankton growth. In Prydz Bay, however, both the iron treatments and the controls showed rapid phytoplankton growth, and no significant effect (P > 0.05, Student's t-test) as a consequence of iron addition was observed. These results confirmed the limiting role of iron in the Ross Sea and indicated that iron was not the primary factor limiting phytoplankton growth in Prydz Bay. Because the light environment for phytoplankton was enhanced in experimental bottles, light was assumed to be responsible for the rapid growth of phytoplankton in all treatments and to be the limiting factor controlling field phytoplankton growth in Prydz Bay. During the incubation experiments, nutrient consumption ratios also changed with the physiological status and the growth phases of phytoplankton cells. When phytoplankton growth was stimulated by iron addition, N was the first and Si was the last nutrient which absorption enhanced. The Si/N and Si/P consumption ratios of phytoplankton in the stationary and decay phases were significantly higher than those of rapidly growing phytoplankton. These findings were helpful for studies of the marine ecosystem and biogeochemistry in Prydz Bay, and were also valuable for biogeochemical studies of carbon and nutrients in various marine environments.
关键词	Iron Limitation Iron Hypothesis Southern Ocean Prydz Bay Nutrient Consumption Ratio
学科领域	Geosciences, Multidisciplinary
DOI	10.1007/s11430-009-0141-9
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000269974200014
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2634
专题	海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.State Ocean Adm, Inst Oceanog 1, Marine Ecol Res Ctr, Qingdao 266061, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Sun Song,Pu XinMing,Zhang YongShan. In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2009,52(9):1426-1435.
APA	Sun Song,Pu XinMing,&Zhang YongShan.(2009).In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,52(9),1426-1435.
MLA	Sun Song,et al."In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 52.9(2009):1426-1435.

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