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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Who really matters: Influence of German Bight key bioturbators on biogeochemical cycling and sediment turnover
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Who really matters: Influence of German Bight key bioturbators on biogeochemical cycling and sediment turnover

机译：真正重要的是：德国Bight关键生物扰动器对生物地球化学循环和沉积物周转的影响

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摘要

Loss of bioturbating key species from marine sediments has been shown to strongly reduce benthic biogeochemical cycling and ecosystem functioning. It is thus of paramount importance to identify key bioturbators and quantify their effect on biogeochemical processes. To do so trait based community and species bioturbation potential (BPc and BPi) was mapped for 423 North Sea stations in the German Bight. Mapping of BPc and BPi identified Amphiura filiformis, Echinocardium cordatum and Nucula nitidosa as major bioturbating species in the German Bight. The effects of these species on benthic nutrient flux (i.e., changing concentrations of silicate Delta[SiO2], ammonium Delta[NH4+], nitrate Delta[NO3- and nitrite Delta[NO2-]) were quantified in laboratory experiments together with their bioturbation rate (D-b) and bioirrigation activity. The experiments indicated that mapped species bioturbation potential (BPi) may be a poor tool for identifying key bioturbators while calculated experimental BPi ((PBPi)-P-exp) was a good indicator for species impact on biogeochemical cycling. Out of the three investigated species only E. cordatum significantly influenced biogeochemical cycling, whereas the effect of A. filiformis remained inconclusive potentially because arm damage and regeneration may affect the bioturbation activity of many individuals. The bivalve N. nitidosa showed only little impact on biogeochemical cycling, although this species was found to be an active bioturbator. Accordingly, E. cordatum may be considered one of the most important contributors to biogeochemical cycling at the sediment-water interface in the German Bight. (C) 2017 Elsevier B.V. All rights reserved.
机译：已经证明，海洋沉积物中生物扰动关键物种的损失会大大降低底栖生物地球化学循环和生态系统功能。因此，至关重要的是确定关键的生物扰动物并量化其对生物地球化学过程的影响。为此，在德国湾的423个北海站绘制了基于特征的群落和物种生物扰动潜力（BPc和BPi）。 BPc和BPi的图谱确定了丝裂Am（Amphphiura filiformis），E棘棘心cord（Echinocardium cordatum）和针Nu（Nucula nitidosa）是德国湾中的主要生物扰动物种。在实验室实验中量化了这些物种对底栖营养通量的影响（即，硅酸盐Delta [SiO2]，铵Delta [NH4 +]，硝酸盐Delta [NO3-和亚硝酸盐Delta [NO2-]的浓度变化）及其生物扰动率（db）和生物灌溉活动。实验表明，测绘物种生物扰动潜力（BPi）可能不是识别关键生物扰动者的有效工具，而计算的实验BPi（（PBPi）-P-exp）是物种对生物地球化学循环影响的良好指标。在这三个被调查物种中，只有科尔多瓦氏菌显着影响生物地球化学循环，而丝状土壤杆菌的影响仍未定论，可能是由于手臂损伤和再生可能影响许多人的生物扰动活性。尽管发现该物种是活跃的生物扰动者，但双壳类N. nitidosa对生物地球化学循环几乎没有影响。因此，在德国湾的沉积物-水界面处，脐带肠球菌被认为是生物地球化学循环最重要的因素之一。 （C）2017 Elsevier B.V.保留所有权利。

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