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首页> 外文期刊>Marine ecology progress series >Oxygen dynamics and porewater transport in sediments inhabited by the invasive polychaete Marenzelleria viridis
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Oxygen dynamics and porewater transport in sediments inhabited by the invasive polychaete Marenzelleria viridis

机译：侵入性多毛Marenzelleria viridis栖息的沉积物中的氧动力学和孔隙水迁移

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摘要

The polychaete Marenzelleria viridis is an invasive species and often replaces the native Nereis diversicolor. This shift leads to more reduced conditions and changes in the biogeo-chemical function of the sediments. By combining imaging techniques for O_2 (planar optodes) and irrigation patterns (rhodamine WT and brilliant blue), we investigated the relationship between irrigation and O_2 dynamics in burrows of M. viridis. The investigated animals shifted between 2 modes of ventilation: ciliary pumping for 77 % of the time and muscular pumping for 23 % of the time. On average, muscular pumping was induced every 0.4 h. During ciliary pumping, oxic water was pumped into blind-ended burrows and into the surrounding sediment, inducing an upward porewater transport of O_2-depleted water. This pattern was reversed during muscular pumping. The 2 pumping modes induced oscillating O_2 penetration along the burrow wall and along the primary sediment-water interface. The average net downward irrigation rate, including both pumping modes, amounted to 11.1 × 10~(-3) ± 2.4 × 10~(-3) ml min~(-1). The estimated average oxic sediment volume was 2.1 ± 0.5 cm~3 per burrow, and the burrow-specific O_2 consumption was 45.6 ± 18.1 nmol min~(-1). M. viridis burrows and the ambient sediment are relatively O_2 depleted, with intensified rates of O_2 consumption, compared to similar-sized native N. diversicolor. The complex O_2 dynamics induced a unique microenvironment that must favor meiofauna and micro-bial communities that are tolerant to oxic-anoxic oscillations or that have the ability to migrate along with the pulsing oxic-anoxic interface.
机译：多毛Marenzelleria viridis是一种入侵物种，经常替代本地的Nereis diversicolor。这种变化导致条件进一步减少，沉积物的生物地球化学功能发生变化。通过结合O_2（平面光电二极管）和灌溉模式（若丹明WT和亮蓝色）的成像技术，我们研究了灌溉与M. viridis洞穴中O_2动态之间的关系。被调查的动物在两种通气模式之间转换：睫状肌抽气占77％的时间，肌肉抽气占23％的时间。平均而言，每0.4小时就会产生一次肌肉抽动。在睫状泵吸过程中，将有氧水泵入盲端洞穴和周围的沉积物中，从而导致O_2贫化水的向上孔隙水输送。在肌肉抽动过程中这种模式被逆转。两种抽水方式引起了O_2沿洞穴壁和主要沉积物-水界面的振荡渗透。包括两种抽水方式在内的平均净向下灌溉速率为11.1×10〜（-3）±2.4×10〜（-3）ml min〜（-1）。估计每个洞穴的平均有氧沉积物体积为2.1±0.5 cm〜3，并且洞穴特定的O_2消耗为45.6±18.1 nmol min〜（-1）。与相似大小的天然杂色猪笼草相比，绿孢猪笼草的洞穴和周围的沉积物相对耗竭了O_2，消耗的O_2速率增加。复杂的O_2动力学诱发了一个独特的微环境，该微环境必须有利于耐氧化-缺氧振荡或具有随脉冲式氧化-缺氧界面迁移的微生物群落和微生物群落。

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  • 来源
    《Marine ecology progress series》 |2014年第14期|181-192|共12页
  • 作者

    Zeljko Jovanovic; Morten Larsen; Cintia Organo Quintana; Erik Kristensen; Ronnie N. Glud;

  • 作者单位

    Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;

    Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark,Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban PA37 1QA, UK,Greenland Climate Research Center (CO Greenland Institute of National Resources), Kivioq 2, Box 570,3900 Nuuk, Greenland;

    Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;

    Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;

    Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark,Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban PA37 1QA, UK,Greenland Climate Research Center (CO Greenland Institute of National Resources), Kivioq 2, Box 570,3900 Nuuk, Greenland,Artic Research Center, C. F. Mailers Alle 8, 8000 Aarhus University C, Denmark;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bioirrigation; Oxygen dynamics; Marenzelleria viridis; Planar optode; Rhodamine;

    机译：生物灌溉;氧气动力学Marenzelleria viridis;平面光电二极管罗丹明;

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