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首页> 外文期刊>Harmful Algae >Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems
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Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems

机译：比较Tau泻湖中的硅藻和亚历山大连叶藻/塔玛兰森水华：季节性N受限系统中溶解有机氮的重要性

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摘要

Diatom blooms in Thau lagoon are always related to rain events leading to inputs of inorganic nutrients such as phosphate, ammonium and nitrate through the watershed with time lags of about 1 week. In contrast, blooms of Alexandrium catenella/tamarense can occur following periods of 3 weeks without precipitation and no significant input of conventional nutrients such as nitrate and phosphate. Field results also indicate a significant drop (from 22-25 to 15-16 μM over 3 days) in dissolved organic nitrogen (DON) at the bloom peak, as well as a significant inverse relationship between A. catenella/ tamarense cell density and DON concentrations that is not apparent for diatom blooms. Such dinoflagellate blooms are also associated with elevated (6-9 μM) ammonium concentrations, a curious feature also observed by other investigators, possibly the results of ammonium excretion by this organism during urea or other organic nitrogen assimilation. The potential use of DON by this organism represents short cuts in the nitrogen cycle between plants and nutrients and requires a new model for phytoplankton growth that is different from the classical diatom bloom model. In contrast to such diatom blooms that are due to conventional (nitrate, phosphate) nutrient pulses, Alexandrium catenella/tamarense blooms on the monthly time scale are due to organic nutrient enrichment, a feature that allows net growth rates of about 1.3 d~(-1) a value higher than that generally attributed to such organisms.
机译：Thau泻湖中的硅藻开花总是与降雨事件相关，降雨事件导致流域通过约1周的时间输入无机营养素，例如磷酸盐，铵盐和硝酸盐。相比之下，亚历山大·卡德内拉/塔玛兰丝的花开会在三周后出现，而没有沉淀，并且没有大量输入常规营养素，例如硝酸盐和磷酸盐。田间结果还表明，在开花高峰期，溶解的有机氮（DON）在3天内显着下降（从22-25降低至15-16μM），并且链状土壤杆菌/塔玛森菌细胞密度与DON之间存在显着的反比关系。硅藻水华不明显的浓度。此类鞭毛藻的繁殖还与铵浓度升高（6-9μM）有关，其他研究人员也观察到一个奇怪的特征，可能是这种生物在尿素或其他有机氮同化过程中排泄铵的结果。这种生物体对DON的潜在利用代表了植物与养分之间氮循环的捷径，并且需要一种不同于经典硅藻绽放模型的新的浮游植物生长模型。与传统的（硝酸盐，磷酸盐）养分脉冲导致的硅藻绽放相反，月时间尺度上的亚历山大连叶藻/塔玛兰森绽放是由于有机养分富集而引起的，该特征允许净生长速率约为1.3 d〜（- 1）高于通常归因于此类生物的值。

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  • 来源
    《Harmful Algae》 |2014年第7期|84-91|共8页
  • 作者

    Yves Collos; Cecile Jauzein; Widya Ratmaya; Philippe Souchu; Eric Abadie; Andre Vaquer;

  • 作者单位

    Ecologie des Systemes Marins Cotiers, UMR 5119 CNRS, Universite Montpellier 2, IRD, CC093, 34095 Montpellier Cedex 5, France;

    Ecologie des Systemes Marins Cotiers, UMR 5119 CNRS, Universite Montpellier 2, IRD, CC093, 34095 Montpellier Cedex 5, France;

    Master of Coastal Resources Management, Diponegoro University, Jl. Imam Bardjo SH N° 5, Gedung Pascasarjana Lantai 3, Semarang 50241, Jawa Tengah, Indonesia;

    Ifremer, Laboratoire Environnement Ressource Morbihan-Pays de la Loire, Rue de l'Ile d'Yeu, BP 21105, 44311 Nantes Cedex 03, France;

    Ifremer, Laboratoire Environnement Ressource Languedoc-Roussillon, BP 171, 34203 Sete Cedex, France;

    Ecologie des Systemes Marins Cotiers, UMR 5119 CNRS, Universite Montpellier 2, IRD, CC093, 34095 Montpellier Cedex 5, France;

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  • 正文语种 eng
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  • 关键词

    Alexandrium catenella/tamarense; Non classical blooms; Organic nitrogen; Ammonium; Growth rate;

    机译：亚历山大连叶/塔玛兰芝;非古典花朵;有机氮铵;增长率;

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