The impact of mobile demersal fishing on carbon storage in seabed sediments.
The impact of mobile demersal fishing on carbon storage in seabed sediments.
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DOI：
10.1111/gcb.16105
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发表时间：
2022-05
影响因子：
11.6
通讯作者：
中科院分区：
文献类型：
--
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潮下海洋沉积物是地球上主要的碳储存之一，并强烈影响大气CO2的海洋汇。迄今为止，人类在海底最广泛的活动是底拖网/疏浚鱼类和贝类。一项全球一级估计表明，移动的底层捕捞活动每年可从海底沉积物碳储存中释放0.16-0.4千兆吨有机碳（OC）（Sala等人，2021年）。然而，这种计算存在许多不确定性。在这里，我们讨论了潜在的驱动力的变化，海底沉积物有机碳储量由于移动的底层捕捞活动，并进行文献综述，综合研究，这种相互作用已被直接调查。在某些环境条件下，我们假设，移动的底栖捕捞将减少OC在海底商店，由于生产较低的植物群和动物群，精细絮凝材料的损失，增加沉积物再悬浮，混合和运输，并增加氧气暴露。减少将在不同程度上被动物群生物扰动和群落呼吸作用的减少、货架外运输的增加以及营养物再悬浮引起的初级生产的增加所抵消。直接调查底层捕捞对OC种群影响的研究结果好坏参半。在49项调查中，61%的调查结果没有显著影响; 29%的调查结果报告由于捕捞活动导致OC降低，10%的调查结果报告OC升高。关于海底的再矿化率，四项调查报告说，底层捕捞活动降低了再矿化率，三项调查报告说再矿化率较高。不同结果之间的环境和实验特征模式在很大程度上是模糊的。迫切需要更多的证据来准确量化不同环境背景下人为物理扰动对海底碳的影响，并将基于证据的全面碳考虑纳入全球海底管理。潮下海洋沉积物是地球上主要的碳储存之一，并强烈影响大气CO2的海洋汇。考虑到基本原则，我们假设，在某些环境条件下，拖网/疏浚鱼类和贝类会减少海底沉积物碳储存;然而，在某些情况下，这可能会被正反馈机制抵消。对现场直接调查这一影响的研究进行的审查也强调了好坏参半的结果。迫切需要更多的证据来准确量化不同环境背景下的影响，并将基于证据的碳考虑纳入全球海底管理。
Subtidal marine sediments are one of the planet's primary carbon stores and strongly influence the oceanic sink for atmospheric CO2. By far the most widespread human activity occurring on the seabed is bottom trawling/dredging for fish and shellfish. A global first‐order estimate suggested mobile demersal fishing activities may cause 0.16–0.4 Gt of organic carbon (OC) to be remineralized annually from seabed sediment carbon stores (Sala et al., 2021). There are, however, many uncertainties in this calculation. Here, we discuss the potential drivers of change in seabed sediment OC stores due to mobile demersal fishing activities and conduct a literature review, synthesizing studies where this interaction has been directly investigated. Under certain environmental settings, we hypothesize that mobile demersal fishing would reduce OC in seabed stores due to lower production of flora and fauna, the loss of fine flocculent material, increased sediment resuspension, mixing and transport and increased oxygen exposure. Reductions would be offset to varying extents by reduced faunal bioturbation and community respiration, increased off‐shelf transport and increases in primary production from the resuspension of nutrients. Studies which directly investigated the impact of demersal fishing on OC stocks had mixed results. A finding of no significant effect was reported in 61% of 49 investigations; 29% reported lower OC due to fishing activities, with 10% reporting higher OC. In relation to remineralization rates within the seabed, four investigations reported that demersal fishing activities decreased remineralization, with three reporting higher remineralization rates. Patterns in the environmental and experimental characteristics between different outcomes were largely indistinct. More evidence is urgently needed to accurately quantify the impact of anthropogenic physical disturbance on seabed carbon in different environmental settings and to incorporate full evidence‐based carbon considerations into global seabed management. Subtidal marine sediments are one of the planet's primary carbon stores and strongly influence the oceanic sink for atmospheric CO2. Considering basic principles, we hypothesize that under certain environmental settings, trawling/dredging for fish and shellfish would reduce seabed sediment carbon storage; however, this may be offset by positive feedback mechanisms in some circumstances. A review of studies which directly investigated this impact in situ also highlighted mixed results. More evidence is urgently needed to accurately quantify this impact in different environmental settings, and incorporate full evidence‐based carbon considerations into global seabed management.
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DOI：
10.1073/pnas.1802379115
发表时间：
2018-10-23
影响因子：
11.1
作者：
Amoroso RO;Pitcher CR;Rijnsdorp AD;McConnaughey RA;Parma AM;Suuronen P;Eigaard OR;Bastardie F;Hintzen NT;Althaus F;Baird SJ;Black J;Buhl-Mortensen L;Campbell AB;Catarino R;Collie J;Cowan JH Jr;Durholtz D;Engstrom N;Fairweather TP;Fock HO;Ford R;Gálvez PA;Gerritsen H;Góngora ME;González JA;Hiddink JG;Hughes KM;Intelmann SS;Jenkins C;Jonsson P;Kainge P;Kangas M;Kathena JN;Kavadas S;Leslie RW;Lewis SG;Lundy M;Makin D;Martin J;Mazor T;Gonzalez-Mirelis G;Newman SJ;Papadopoulou N;Posen PE;Rochester W;Russo T;Sala A;Semmens JM;Silva C;Tsolos A;Vanelslander B;Wakefield CB;Wood BA;Hilborn R;Kaiser MJ;Jennings S
通讯作者：
Jennings S
DOI：
10.1073/pnas.2108532118
发表时间：
2021-08-03
影响因子：
11.1
作者：
Britten GL;Duarte CM;Worm B
通讯作者：
Worm B
影响因子：
2.3
作者：
CHURCHILL, JH
通讯作者：
CHURCHILL, JH
影响因子：
4.5
作者：
Borsje, Bas W.;Bouma, Tjeerd J.;Hulscher, Suzanne J. M. H.
通讯作者：
Hulscher, Suzanne J. M. H.
影响因子：
4.9
作者：
Cloern, J. E.;Foster, S. Q.;Kleckner, A. E.
通讯作者：
Kleckner, A. E.