Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1813192115 |
Pervasive iron limitation at subsurface chlorophyll maxima of the California Current | |
Shane L. Hogle; Christopher L. Dupont; Brian M. Hopkinson; Andrew L. King; Kristen N. Buck; Kelly L. Roe; Rhona K. Stuart; Andrew E. Allen; Elizabeth L. Mann; Zackary I. Johnson; and Katherine A. Barbeau | |
2018-12-10 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
出版年 | 2018 |
卷号 | 115期号:52页码:13300-13305 |
英文摘要 | AbstractSubsurface chlorophyll maximum layers (SCMLs) are nearly ubiquitous in stratified water columns and exist at horizontal scales ranging from the submesoscale to the extent of oligotrophic gyres. These layers of heightened chlorophyll and/or phytoplankton concentrations are generally thought to be a consequence of a balance between light energy from above and a limiting nutrient flux from below, typically nitrate (NO3). Here we present multiple lines of evidence demonstrating that iron (Fe) limits or with light colimits phytoplankton communities in SCMLs along a primary productivity gradient from coastal to oligotrophic offshore waters in the southern California Current ecosystem. SCML phytoplankton responded markedly to added Fe or Fe/light in experimental incubations and transcripts of diatom and picoeukaryote Fe stress genes were strikingly abundant in SCML metatranscriptomes. Using a biogeochemical proxy with data from a 40-y time series, we find that diatoms growing in California Current SCMLs are persistently Fe deficient during the spring and summer growing season. We also find that the spatial extent of Fe deficiency within California Current SCMLs has significantly increased over the last 25 y in line with a regional climate index. Finally, we show that diatom Fe deficiency may be common in the subsurface of major upwelling zones worldwide. Our results have important implications for our understanding of the biogeochemical consequences of marine SCML formation and maintenance. |
英文关键词 | nutrient limitation iron light California Current deep chlorophyll maximum |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205038 |
专题 | 地球科学 资源环境科学 气候变化 |
推荐引用方式 GB/T 7714 | Shane L. Hogle,Christopher L. Dupont,Brian M. Hopkinson,et al. Pervasive iron limitation at subsurface chlorophyll maxima of the California Current[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(52):13300-13305. |
APA | Shane L. Hogle.,Christopher L. Dupont.,Brian M. Hopkinson.,Andrew L. King.,Kristen N. Buck.,...&and Katherine A. Barbeau.(2018).Pervasive iron limitation at subsurface chlorophyll maxima of the California Current.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(52),13300-13305. |
MLA | Shane L. Hogle,et al."Pervasive iron limitation at subsurface chlorophyll maxima of the California Current".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.52(2018):13300-13305. |
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