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首页> 外文期刊>Marine ecology progress series >Harmful algal blooms as a sink for inorganic nutrients in a eutrophic estuary
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Harmful algal blooms as a sink for inorganic nutrients in a eutrophic estuary

机译：有害的藻类绽放为富营养的河口中无机营养素的水槽

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摘要

Phytoplankton-mediated nutrient fluxes typically provide only pulsed relief to adjacent coastal waters during the productive period, with nutrient export increasing in the absence of substantial phytoplankton biomass. On the warm temperate coastline of South Africa, the Sundays Estuary is characterised by highly regulated freshwater inflow patterns, nutrient-enriched conditions, and resident harmful algal blooms (HABs). Given these attributes, the study objective was to investigate the effect of these phytoplankton blooms on fluvial inorganic nutrient dynamics. To assess uptake, we analysed inorganic nutrient (phosphate, ammonium, NOx) and phytoplankton concentrations in relation to salinity using data from 17 surveys. Property-salinity mixing diagrams and statistical analyses indicated a positive association between increasing phytoplankton biomass and decreasing NOx flux (p 0.001), and to a lesser degree phosphate flux (p = 0.22), along the gradient from low-salinity inner estuary to high salinity outer estuary. High biomass HAB accumulations of Heterosigma akashiwo ( 100 mu g chl a l(-1)) represent significant removal of available NOx (similar to 100%) and phosphate ( 75%) during warmer conditions ( 20 degrees C). These events, together with continuous inorganic nutrient uptake during less severe bloom conditions, remove a substantial portion of annual NOx and phosphate loads (36.5 and 36.4% flux, respectively). Although this buffers inorganic nutrient loading to adjacent coastal waters, it also represents an emerging legacy pollution issue in the form of a benthic accumulation of organic material in bottom waters subject to recurrent hypoxia. Future management efforts should adopt an ecosystem-based approach centred around simultaneous restoration of hydrological variability and dual nutrient reduction strategies (N and P).
机译：植物植物介导的营养助焊剂通常在生产期间仅提供对邻近的沿海水域的脉冲浮雕，在没有大量的浮游植物生物量的情况下，营养出口增加。在南非的温暖温带海岸线上，周日河口的特点是受到高度规范的淡水流入模式，营养丰富的条件和居民有害藻类绽放（HABS）。鉴于这些属性，研究目标是探讨这些浮游植物盛开对氟尿无机营养动态的影响。为了评估吸收，我们使用17调查的数据分析了与盐度相关的无机营养素（磷酸铵，铵，NOx）和浮游植物浓度。性质 - 盐度混合图和统计分析表明，浮游植物生物质和降低NOx通量（P <0.001）之间的阳性关联，沿着低盐度内嘴的梯度较小程度的磷酸焊剂（P = 0.22）高盐度外部河口。 HotosoSigma akashiwo（＆ 100 mu g Chl Al（-1））的高生物量Hab累积表示在较温暖的条件下显着去除可用NOx（类似于100％）和磷酸盐（＆ 75％）（＆ 20℃） 。这些事件与连续无机营养素摄取在不太严重的绽放条件下，除去大部分年度NOx和磷酸盐载荷（36.5和36.4％的通量）。虽然这种缓冲了无机营养加载到相邻的沿海水域，但它还代表了底部水中有机材料的底层积累的形式的新兴传统污染问题。未来的管理努力应采用基于生态系统的方法，其围绕同时恢复水文变异性和双营养还原策略（N和P）。

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  • 来源
    《Marine ecology progress series》 |2021年第31期|63-76|共14页
  • 作者

    Lemley Daniel A.; Adams Janine B.; Largier John L.;

  • 作者单位

    Nelson Mandela Univ Bot Dept ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ Inst Coastal & Marine Res ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ DSI NRF Res Chair Shallow Water Ecosyst ZA-6031 Port Elizabeth South Africa;

    Nelson Mandela Univ Bot Dept ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ Inst Coastal & Marine Res ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ DSI NRF Res Chair Shallow Water Ecosyst ZA-6031 Port Elizabeth South Africa;

    Univ Calif Davis Dept Environm Sci & Policy Davis CA 95616 USA|Univ Calif Davis Coastal & Marine Sci Inst Bodega Bay CA 94923 USA;

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  • 正文语种 eng
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  • 关键词

    Coastal filter; Eutrophication; Heterosigma akashiwo; Nutrient transformation; Phytoplankton;

    机译：沿海过滤器;富营养化;异质寡糖Akashiwo;营养转化;浮游植物;

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