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Benthic respiration and stoichiometry of regenerated nutrients in lake sediments with Dreissena polymorpha

机译：多形海藻Dreissena polymorpha在底泥中的底栖呼吸作用和化学计量比

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摘要

The effect of patchy colonies of the invasive zebra mussel (Dreissena polymorpha) on sedimentary processes was investigated in a mesotrophic lake (Plateliai Lake, Lithuania). Benthic fluxes of O_2, TCO_2, CH_4, Mn~(2+), Fe~(2+), N_2, the inorganic forms of N, Si and P and dissolved organic C and N were quantified by dark incubations of sediments cores, with and without D. polymorpha. Individual mussels also were incubated for metabolic measurements. Sediments with D. polymorpha had significantly higher O_2 and TCO_2 fluxes and displayed higher rates of denitrification. The presence of mussels also resulted in higher regeneration of P and N (mostly as ammonium) while the effect on Si was not significant. However, likely due to the low zebra mussel biomass (57.2 ± 25.3 g_(SFDW) m~(-2)), biodeposition has not changed the ratio between anaerobic and total respiration. Methane and reduced metals fluxes were in fact similar in the presence and absence of D. polymorpha. Incubations of mussels without sediments confirmed that bivalve metabolism was the main driver of benthic respiration and nutrient recycling. Nitrate production suggested the presence of nitrifiers associated with the molluscs. The main outcome of this study was that zebra mussels alter the quantity and the stoichiometry of nutrients regenerated by the benthic compartment. The enhancement of nitrogen loss via denitrification, by a factor of 1.5, was much less pronounced than the increase in ammonium recycling rate, stimulated by a factor of 33. Negligible PO_4~(3-) fluxes in bare sediments (-3.4 ± 6.8 μmol m~(-2) h~(-1)) increased in the presence of mussels and considerable amounts of this nutrient (69.6 ± 29.4 μmol m~(-2) h~(-1)) were mobilized to the water column. Further research should address other nutrient sources to the lake to verify whether altered rates and stoichiometry of benthic regeneration can affect primary producer community composition and activity.
机译：在中营养型湖泊（立陶宛Plateliai湖）中研究了斑马侵入性斑驳贻贝（Dreissena polymorpha）的斑块菌落对沉积过程的影响。通过沉积岩心的暗温孵化，定量分析了O_2，TCO_2，CH_4，Mn〜（2 +），Fe〜（2 +），N_2，有机态氮，硅和磷以及溶解的有机碳和氮的底流。没有D. polymorpha。还将贻贝孵化以进行代谢测量。多形藻的沉积物的O_2和TCO_2通量明显更高，反硝化率更高。贻贝的存在还导致P和N（主要是铵）的较高再生，而对Si的影响不明显。然而，可能由于斑马贻贝生物量低（57.2±25.3 g_（SFDW）m〜（-2）），生物沉积并未改变厌氧和总呼吸之间的比例。实际上，在存在和不存在多形藻的情况下，甲烷和还原金属的通量相似。无沉积物的贻贝孵化证实双壳类生物代谢是底栖呼吸和养分循环的主要驱动力。硝酸盐的产生表明存在与软体动物相关的硝化剂。这项研究的主要结果是斑马贻贝改变了底栖舱室再生的养分的数量和化学计量。通过反硝化作用使氮损失增加了1.5倍，远没有受到33倍的刺激引起的铵再循环率增加明显。裸露沉积物中的PO_4〜（3-）通量可忽略不计（-3.4±6.8μmol在贻贝的存在下，m〜（-2）h〜（-1））增加，并且大量的这种营养素（69.6±29.4μmolm〜（-2）h〜（-1））被转移到水柱中。进一步的研究应探讨湖泊的其他养分来源，以验证底栖生物再生速率和化学计量的变化是否会影响初级生产者社区的组成和活动。

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  • 来源
    《Aquatic Sciences》 |2014年第3期|405-417|共13页
  • 作者

    Tomas Ruginis; Marco Bartoli; Jolita Petkuviene; Mindaugas Zilius; Irma Lubiene; Alex Laini; Arturas Razinkovas-Baziukas;

  • 作者单位

    Coastal Research and Planning Institute, University of Klaipeda, H. Manto 84, 92294 Klaipeda, Lithuania;

    Department of Life Sciences, University of Parma, Viale Usberti 11/A, 43100 Parma, Italy;

    Coastal Research and Planning Institute, University of Klaipeda, H. Manto 84, 92294 Klaipeda, Lithuania;

    Coastal Research and Planning Institute, University of Klaipeda, H. Manto 84, 92294 Klaipeda, Lithuania;

    Coastal Research and Planning Institute, University of Klaipeda, H. Manto 84, 92294 Klaipeda, Lithuania;

    Department of Life Sciences, University of Parma, Viale Usberti 11/A, 43100 Parma, Italy;

    Coastal Research and Planning Institute, University of Klaipeda, H. Manto 84, 92294 Klaipeda, Lithuania;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dreissena polymorpha; Sediments; Aerobic respiration; Denitrification; Nutrients; Recycling; Stoichiometry;

    机译：德瑞香沉积物;有氧呼吸;反硝化;营养素;回收;化学计量;

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