Effect of dissolved iron (II) and temperature on growth of the Southern Ocean phytoplankton species Fragilariopsis cylindrus and Phaeocystis antarctica

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION Polar Biology Pub Date : 2023-09-24 DOI:10.1007/s00300-023-03191-z
Helene Aflenzer, Linn Hoffmann, Thomas Holmes, Kathrin Wuttig, Cristina Genovese, Andrew Ross Bowie
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Abstract

Abstract Low bioavailability of the vital element iron (Fe) limits primary production in large regions of the Southern Ocean, thus impacting phytoplankton community structures. Primary productivity seems to be particularly sensitive to the reduced form of iron (Fe(II)), which is thought to be the most readily bioavailable redox form of Fe in the ocean. Here, we investigated the impact of temperature (3 °C, 5 °C and 7 °C) and Fe(II) additions (+ 5 nM) on growth of two Southern Ocean phytoplankton species Fragilariopsis cylindrus and Phaeocystis antarctica in coastal and open ocean water. At all tested temperatures, growth rates of P. antarctica were significantly higher with added iron, compared to the treatments without added iron in both waters. Temperature only had a significant effect on the growth rate of this species when it was raised to 7 °C in all treatments. For F. cylindrus , growth rates only significantly increased with iron addition at 7 °C in both water types. Temperature did not affect the growth rate of F. cylindrus except for a significant reduction without iron addition at 7 °C in coastal water. These results highlight the complex interactions between Fe bioavailability and temperature on Southern Ocean phytoplankton growth. Thus, certain Southern Ocean phytoplankton species may have higher growth rates in regions of the ocean that will warm the most and possibly experience greater Fe supply under future climate conditions, such as coastal regions. This may result in changes in phytoplankton community structures with implications for carbon sequestration efficiency under future climate conditions.

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溶解铁(II)和温度对南大洋浮游植物白茅和南极褐囊藻生长的影响
重要元素铁(Fe)的低生物利用度限制了南大洋大片地区的初级生产,从而影响了浮游植物群落结构。初级生产力似乎对铁的还原形式(铁(II))特别敏感,这被认为是海洋中最容易生物利用的铁的氧化还原形式。本文研究了温度(3°C、5°C和7°C)和铁(II)添加量(+ 5 nM)对南大洋沿海和开阔海域两种浮游植物白茅Fragilariopsis us和南极Phaeocystis生长的影响。在所有测试温度下,与未添加铁的处理相比,添加铁的南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极南极在所有处理中,温度升高至7°C时,对该物种的生长速度有显著影响。对于圆柱菇,在7°C时,两种水类型的生长速率都随着铁的加入而显著增加。温度不影响圆柱菇的生长速度,但在7°C的沿海水域中,不加铁会显著降低生长速度。这些结果强调了铁的生物利用度和温度对南大洋浮游植物生长的复杂相互作用。因此,某些南大洋浮游植物物种可能在海洋变暖最严重的地区有更高的生长速度,并可能在未来气候条件下经历更大的铁供应,如沿海地区。这可能导致浮游植物群落结构的变化,对未来气候条件下的碳固存效率产生影响。
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来源期刊
Polar Biology
Polar Biology 生物-生态学
CiteScore
3.60
自引率
11.80%
发文量
116
审稿时长
3-8 weeks
期刊介绍: Polar Biology publishes Original Papers, Reviews, and Short Notes and is the focal point for biologists working in polar regions. It is also of interest to scientists working in biology in general, ecology and physiology, as well as in oceanography and climatology related to polar life. Polar Biology presents results of studies in plants, animals, and micro-organisms of marine, limnic and terrestrial habitats in polar and subpolar regions of both hemispheres. Taxonomy/ Biogeography Life History Spatio-temporal Patterns in Abundance and Diversity Ecological Interactions Trophic Ecology Ecophysiology/ Biochemistry of Adaptation Biogeochemical Pathways and Cycles Ecological Models Human Impact/ Climate Change/ Conservation
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