AbstractThe Arctic Ocean is a region particularly prone to ongoing ocean acidification (OA) and climate-driven '/> Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance
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Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance

机译:北极浮游植物对海洋酸化和增强辐照度的抵抗力

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AbstractThe Arctic Ocean is a region particularly prone to ongoing ocean acidification (OA) and climate-driven changes. The influence of these changes on Arctic phytoplankton assemblages, however, remains poorly understood. In order to understand how OA and enhanced irradiances (e.g., resulting from sea–ice retreat) will alter the species composition, primary production, and eco-physiology of Arctic phytoplankton, we conducted an incubation experiment with an assemblage from Baffin Bay (71°N, 68°W) under different carbonate chemistry and irradiance regimes. Seawater was collected from just below the deep Chlamaximum, and the resident phytoplankton were exposed to 380 and 1000 µatm pCO2at both 15 and 35% incident irradiance. On-deck incubations, in which temperatures were 6 °C above in situ conditions, were monitored for phytoplankton growth, biomass stoichiometry, net primary production, photo-physiology, and taxonomic composition. During the 8-day experiment, taxonomic diversity decreased and the diatomChaetoceros socialisbecame increasingly dominant irrespective of light or CO2levels. We found no statistically significant effects from either higher CO2or light on physiological properties of phytoplankton during the experiment. We did, however, observe an initial 2-day stress response in all treatments, and slight photo-physiological responses to higher CO2and light during the first five days of the incubation. Our results thus indicate high resistance of Arctic phytoplankton to OA and enhanced irradiance levels, challenging the commonly predicted stimulatory effects of enhanced CO2and light availability for primary production.
机译: Abstract 北冰洋地区特别容易发生持续的海洋酸化(OA)和气候变化。然而,这些变化对北极浮游植物组合的影响仍然知之甚少。为了了解OA和增强的辐照度(例如,由于海冰退缩而产生的辐照度)如何改变北极浮游植物的物种组成,初级生产和生态生理,我们对巴芬湾(71° N,68°W)在不同的碳酸盐化学和辐照制度下。从最大的Chl a max深层下方收集海水,并将其浮游植物暴露于380和1000 µatm pCO 2 分别为15%和35%入射辐照度。监测在甲板上孵化温度高于原位温度6°C的浮游植物生长,生物量化学计量,净初级生产,光生理和生物分类组成。在为期8天的实验中,不论光照水平或CO 2 的水平如何,分类硅藻的多样性都降低了,并且硅藻类 Chaetoceros socialis 变得越来越占优势。我们发现,在实验过程中,较高的CO 2 或光照对浮游植物的生理特性均无统计学意义的影响。但是,我们在所有处理中均观察到了最初的2天应激反应,并且在孵育的前5天对较高的CO 2 和光有轻微的光生理反应。因此,我们的结果表明,北极浮游植物对OA具有很高的抵抗力,并且辐照度提高,挑战了通常预测的增强CO 2 的刺激作用和光可用于初级生产。

著录项

  • 来源
    《Polar biology》 |2018年第3期|399-413|共15页
  • 作者单位

    Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia,Marine Biogeosciences, Alfred Wegener Institute – Helmholtz Centre for Polar and Marine Research;

    Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia,Department of Physics and Astronomy, Curtin University;

    Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia;

    School of Earth and Ocean Sciences, University of Victoria;

    Department of Oceanography, Dalhousie University;

    Department of Oceanography, Dalhousie University;

    Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia;

    Marine Biogeosciences, Alfred Wegener Institute – Helmholtz Centre for Polar and Marine Research;

    School of Earth and Ocean Sciences, University of Victoria,Department of Biology, University of Victoria;

    Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia,Department of Botany, University of British Columbia,Peter Wall Institute for Advanced Studies, University of British Columbia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multiple stressors; Climate change; Arctic Ocean; Diatoms; Primary production; Ocean acidification; Irradiances;

    机译:多重胁迫;气候变化;北冰洋;硅藻;一次生;海洋酸化;辐照度;

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