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首页> 外文期刊>Estuarine Coastal and Shelf Science >Macroalgae 515N values in well-mixed estuaries: Indicator of anthropogenic nitrogen input or macroalgae metabolism?
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Macroalgae 515N values in well-mixed estuaries: Indicator of anthropogenic nitrogen input or macroalgae metabolism?

机译：充分混合的河口中的大型藻类515N值：人为氮输入或大型藻类代谢的指标？

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摘要

Although nitrogen stable isotope ratio (δ~(15) N) in macroalgae is widely used as a bioindicator of anthropogenic nitrogen inputs to the coastal zone, recent studies suggest the possible role of macroalgae metabolism in δ~(15)N variability. Simultaneous determinations of δ~(15)N of dissolved inorganic nitrogen (DIN) along the land—sea continuum, inter-species variability of δ~(15)N and its sensitivity to environmental factors are necessary to confirm the efficiency of macroalgae δ~(15)N in monitoring nitrogen origin in mixed-use watersheds. In this study, δ~(15)N of annual and perennial macroalgae (Ulva sp., Enteromorpha sp., Fucus vesiculosus and Fucus serratus) are compared to δ~(15)N-DIN along the Charente Estuary, after characterizing δ~(15)N of the three main DIN sources (i.e. cultivated area, pasture, sewage treatment plant outlet). During late winter and spring, when human activities produce high DIN inputs, DIN sources exhibit distinct δ~(15)N signals in nitrate (NO_3~-) and ammonium (NH_4~+): cultivated area (+6.5 ± 0.6‰ and +9.0 ± 11.0‰), pasture (+9.2 ± 1.8‰ and +12.4‰) and sewage treatment plant discharge (+16.9 ± 8.7‰ and +25.4 ± 5.9‰. While sources show distinct δ~(15)N - NO_3~- in this multiple source catchment, the overall mixture of NO_3~- sources — generally >95% DIN - leads to low variations of δ~(15)N - NO_3~- at the mouth of the estuary (+7.7 to +8.4‰). Even if estuarine δ~(15)N - NO_3~- values are not significantly different from pristine continental and oceanic site (+7.3‰ and +7.4‰), macroalgae δ~(15)N values are generally higher at the mouth of the estuary. This highlights high anthropogenic DIN inputs in the estuary, and enhanced contribution of ~(15)N-depleted NH_4~+ in oceanic waters. Although seasonal variations in δ~(15)N - NO_3~- are low, the same temporal trends in macroalgae δ~(15)N values at estuarine and oceanic sites, and inter-species differences in δ~(15)N values, suggest that macroalgae δ~(15)N values might be modified by the metabolic response of macroalgae to environmental parameters (e.g., temperature, light, DIN concentrations). Differences between annual and perennial macroalgae indicate both a higher integration time of perennial compared to annual macroalgae and the possible role of passive versus active uptake mechanisms. Further studies are required to characterize the sensitivity of macroalgae fractionation to variable environmental conditions and uptake mechanisms.
机译：尽管大型藻类中的氮稳定同位素比（δ〜（15）N）被广泛用作人为沿海地区氮输入的生物指示剂，但最近的研究表明，大型藻类代谢在δ〜（15）N变异性中可能发挥作用。沿陆-海连续体同时测定溶解无机氮（DIN）的δ〜（15）N，δ〜（15）N的种间变异性及其对环境因素的敏感性是确定大型藻类δ〜效率的必要条件（15）N用于监测混合用途流域中的氮源。在这项研究中，在表征了δ〜之后，将夏至河口的一年生和多年生大型藻类（Ulva sp。，Enteromorpha sp。，Fusus vesiculosus和Fusus serratus）的δ〜（15）N与δ〜（15）N-DIN进行了比较。 （15）N的三个主要DIN来源（即耕地，牧场，污水处理厂出口）。在冬末和春季，当人类活动产生大量的DIN输入时，DIN源在硝酸盐（NO_3〜-）和铵盐（NH_4〜+）中显示出独特的δ〜（15）N信号：耕地面积（+6.5±0.6‰）和+ 9.0±11.0‰），牧场（+9.2±1.8‰和+ 12.4‰）和污水处理厂排放量（+16.9±8.7‰和+25.4±5.9‰。）来源显示出明显的δ〜（15）N-NO_3〜-在这个多源流域中，NO_3〜-源的总体混合-通常> 95％DIN-导致河口处δ〜（15）N-NO_3〜-的低变化（+7.7至+ 8.4‰）即使河口δ〜（15）N-NO_3〜-值与原始大陆和海洋站点没有显着差异（+ 7.3‰和+ 7.4‰），大型藻类δ〜（15）N值在河口通常也较高。这突出了河口的人为DIN输入量较高，以及〜（15）N耗尽的NH_4〜+在海洋水域中的贡献增加，尽管δ〜（15）N-NO_3〜-的季节变化较低，但相同大型藻类δ〜（15）N值的时间趋势鱼类在河口和海洋位置，并且物种间的δ〜（15）N值存在差异，表明大型藻类的δ〜（15）N值可能会因大型藻类对环境参数（例如温度，光照， DIN浓度）。年度和多年生大型藻类之间的差异表明，与年度大型藻类相比，多年生大型藻类的整合时间更长，而且被动和主动吸收机制的可能作用也不同。需要进一步的研究来表征大型藻类分离对可变环境条件和摄取机制的敏感性。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第1期|126-138|共13页
  • 作者

    Melanie Raimonet; Gael Guillou; Franchise Mornet; Pierre Richard;

  • 作者单位

    UMR 7619 Sisyphe, Universite Pierre et Marie Curie, 4 Place Jussieu, F-75252 Paris Cedex 05, France ,UENSs, UMR 7266, CNRS-Universite de ha Rochetle, 2 rue Olympe de Gouges, F-17000 La Rochelle, France;

    UENSs, UMR 7266, CNRS-Universite de ha Rochetle, 2 rue Olympe de Gouges, F-17000 La Rochelle, France;

    LRH (Laboratoire de Ressources Halieutiques) de La Rochelle, Ifremer, Place Gaby Coll, BP 7, F-17137 L'Houmeau, France;

    UENSs, UMR 7266, CNRS-Universite de ha Rochetle, 2 rue Olympe de Gouges, F-17000 La Rochelle, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    nitrogen isotopes; nitrate; ammonium; primary producers; indicators; land-sea continuum;

    机译：氮同位素硝酸盐铵主要生产者;指标;陆海连续体;

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