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首页> 外文期刊>Marine biology >Nutrient (N and P) dynamics of the invasive macroalga Gracilaria vermiculophylla: nutrient uptake kinetics and nutrient release through decomposition
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Nutrient (N and P) dynamics of the invasive macroalga Gracilaria vermiculophylla: nutrient uptake kinetics and nutrient release through decomposition

机译：入侵性大型藻ver草的营养（N和P）动力学：分解过程中的养分吸收动力学和养分释放

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摘要

The invasive alga Gracilaria vermiculophylla was introduced to Europe two decades ago and has since become dominant in many shallow estuaries. Gracilaria vermiculophylla is a relatively fast-growing alga that thrives well at low nutrient availability in summer, suggesting that it uses nutrients efficiently, which might give it a competitive advantage over many native species. We studied therefore the nutrient dynamics of G. vermiculophylla and compared it to those of a range of native macroalgal species. Nutrient uptake rates (NH4+, NO3- and PO43-) were compared to growth-related requirements and we found that G. vermiculophylla needs relatively high nutrient concentrations to sustain fast and non-limited growth. This compares to the nutrient dynamics of many fast-growing algae, and we found thus no indication that G. vermiculophylla should have any particular advantage relative to other, sympatric species. The nutrient storage capacity of G. vermiculophylla was, in contrast, relatively large and comparable to that of more slow-growing algae, which, when combined with the low nutrient uptake experienced in summer, could explain how G. vermiculophylla can sustain non-nutrient limited growth through most of the growth season. The biomass of G. vermiculophylla can be massive and estimates showed that gross nutrient uptake could exceed the amount of nutrients received from land. The turnover of Gracilaria biomass is, however, fast and nutrients bound in the resulting detritus are quickly mineralized during decomposition, which is especially important during late summer when water temperatures are high. Invasion and subsequent dominance by G. vermiculophylla may thus affect local nutrient cycling significantly.
机译：入侵藻类Gra草（Gracilaria vermiculophylla）于二十年前被引入欧洲，此后已在许多浅河口占主导地位。 cil草是一种生长相对较快的藻类，在夏季养分含量低的情况下生长良好，表明其有效利用养分，这可能使其比许多本地物种更具竞争优势。因此，我们研究了G. vermiculophylla的营养动态，并将其与一系列天然大型藻类的营养动态进行了比较。将养分吸收速率（NH4 +，NO3-和PO43-）与生长相关的需求进行了比较，我们发现ver豆G. verphylulophylla需要相对较高的养分浓度才能维持快速且不受限制的生长。这与许多快速生长的藻类的营养动态比较，因此我们发现没有迹象表明ver豆G.相对于其他同属物种应具有任何特殊优势。相比之下，ver藜G.的养分储存量相对较大，可与生长较慢的藻类相比，这与夏季吸收的低养分相结合，可以解释G草如何维持非养分。在整个生长季节的大部分时间里生长有限。 ver豆的生物量可能很大，估计表明养分吸收总量可能超过了从土地接收到的养分。然而，Gra草生物量的周转速度很快，分解后的碎屑中结合的养分很快被矿化，这在水温高的夏末特别重要。因此，G虫的入侵和随后的优势地位可能会显着影响局部养分循环。

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  • 来源
    《Marine biology》 |2017年第8期|172.1-172.12|共12页
  • 作者

    Pedersen Morten F.; Johnsen Kathrine L.;

  • 作者单位

    Roskilde Univ, DSE, Box 260, DK-4000 Roskilde, Denmark;

    Roskilde Univ, DSE, Box 260, DK-4000 Roskilde, Denmark;

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