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首页> 外文期刊>Marine biology >Effect of upper beach macrofauna on nutrient cycling of sandy beaches: metabolic rates during wrack decay
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Effect of upper beach macrofauna on nutrient cycling of sandy beaches: metabolic rates during wrack decay

机译：上游大型海滩动物对沙滩养分循环的影响：残骸腐烂过程中的代谢速率

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摘要

Sandy beaches constitute a dynamic interface between marine and terrestrial environments, where inflows of organic matter occur mainly in the form of beach-cast wrack. Decomposition and processing of these inputs stand out as central components of ecosystem functioning and the biogeochemical processes associated with nutrient and carbon cycling. To investigate the effect of upper-beach macrofauna on wrack decomposition and carbon cycling, a manipulative experiment was carried out on Ladeira beach (42A degrees 34.33aEuro(3)N; 9A degrees 3.16aEuro(3)W-NW Spain) and ran for 43 days from 1 June 2011, where wrack decomposition rates and metabolism in the presence or absence of invertebrate macrofauna were assessed. The results showed that activities carried out by macrofauna inhabiting the upper beach are relevant in the decomposition of wrack deposits. Both the weight losses and the degradation rates were significantly higher in treatments with macrofauna access. CO2 fluxes measured throughout the experiment showed that wrack patches act as 'hot spots' of biogeochemical activity, supporting higher metabolic rates with maximum values of CO2 flux recorded in this study similar to 12 A mu mol C m(-2) s(-1). Microbial activity was estimated as being the main contributor to the respiration measured during wrack decay, but fragmentation and activities carried out by the macrofauna had significant effects on the mass loss, degradation rates and carbon fluxes associated with wrack decay process.
机译：沙滩构成了海洋和陆地环境之间的动态界面，其中有机物的流入主要以海滩铸造残骸的形式发生。这些输入的分解和处理是生态系统功能以及与养分和碳循环相关的生物地球化学过程的核心组成部分。为了研究上海滩大型动物对残骸分解和碳循环的影响，在Ladeira海滩（42A度34.33aEuro（3）N； 9A度3.16aEuro（3）W-NW西班牙）上进行了操纵实​​验，从2011年6月1日起的43天内，评估了无脊椎动物大型动物存在或不存在时的残骸分解速率和新陈代谢。结果表明，大型动物栖息在上滩的活动与残骸的分解有关。在大型动物进入的处理中，体重减轻和降解率均显着较高。在整个实验过程中测得的CO2通量表明，残骸斑块是生物地球化学活性的“热点”，支持更高的代谢率，该研究中记录的CO2通量最大值类似于12 Aμmol C m（-2）s（-1） ）。据估计，微生物活动是残骸腐烂过程中测量的呼吸的主要贡献者，但是大型动物的破碎和活动对与残骸腐烂过程相关的质量损失，降解速率和碳通量有重大影响。

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  • 来源
    《Marine biology》 |2018年第8期|133.1-133.12|共12页
  • 作者

    Gomez Marina; Barreiro Francisco; Lopez Jesus; Lastra Mariano;

  • 作者单位

    Univ Vigo, Dept Ecol & Biol Anim, Fac Ciencias, Vigo 36310, Spain;

    Univ Vigo, Dept Ecol & Biol Anim, Fac Ciencias, Vigo 36310, Spain;

    Univ Vigo, Dept Ecol & Biol Anim, Fac Ciencias, Vigo 36310, Spain;

    Estn Ciencias Marinas Toralla ECIMAT, Illa de Toralla S-N, Vigo 36331, Spain;

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