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首页> 外文期刊>Marine ecology progress series >Elucidating trophic pathways in benthic deep-sea assemblages of the Mid-Atlantic Ridge north and south of the Charlie-Gibbs Fracture Zone
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Elucidating trophic pathways in benthic deep-sea assemblages of the Mid-Atlantic Ridge north and south of the Charlie-Gibbs Fracture Zone

机译：阐明查理-吉布斯断裂带南北大西洋中海底栖海组合的营养路径

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摘要

The Mid-Atlantic Ridge (MAR) is a topographically complex feature in the North Atlantic Ocean with little exploration of benthic fauna except in association with hydrothermal venting, resulting in the biodiversity and ecosystem functioning of the MAR benthos away from these sites remaining largely unknown. Stable isotope analysis of carbon, nitrogen and sulphur were undertaken on fauna collected north and south of the Charlie-Gibbs Fracture Zone, in areas believed to be devoid of hydrothermal venting, to investigate the trophodynamics of the benthic assemblage. δ~(13)C and δ~(34)S values of the benthic and bentho-pelagic fauna indicated a dependence on photosynthetic primary production, with no influence from an unknown chemosynthetic source. A large trophic discrimination in δ~(13)C between consumers and potential food sources (particulate organic matter and surficial sediments) suggested reworking of organic carbon before assimilation by benthic fauna. Interpretation of sediment δ~(15)N values was difficult as these ranged between -0.74 and 23.14%o, suggesting further work is required to understand nitrogen utilisation by benthic deposit feeders. Differences in trophic guilds (predators, predator-scavenger, surface deposit feeders, subsurface deposit feeders and suspension feeders) were evident for δ~(13)C and δ~(15)N, with the main difference between the mobile predators-scavengers and the benthic deposit feeders. Dividing the assemblage based on trophic guilds into food chains dependent on phyto-detritus (deposit and suspension feeders) and predation-scavenging (fishes and crustaceans) resulted in strong positive correlations between δ~(15)N and δ~(13)C at both stations. These reflected the 2 dominant trophic pathways organic matter passed through deposit feeders and predatory and scavenging deep-sea fishes and crustaceans.
机译：中大西洋海脊（MAR）是北大西洋的一个地形复杂特征，除了与热液喷发有关外，几乎没有对底栖动物的探索，导致这些地方以外的MAR底栖动物的生物多样性和生态系统功能仍然未知。在查理-吉布斯断裂带北部和南部收集的动物上进行了碳，氮和硫的稳定同位素分析，该区域被认为没有热液排放，研究了底栖动物的对流动力学。底栖和底栖上层动物区系的δ〜（13）C和δ〜（34）S值表明对光合作用的初级生产有依赖性，而不受未知的化学合成来源的影响。消费者与潜在食物来源（颗粒有机物和表层沉积物）之间在δ〜（13）C区域存在较大的营养区别，这表明在底栖动物被同化之前对有机碳进行了重新加工。沉积物δ〜（15）N值的解释很困​​难，因为它们介于-0.74和23.14％o之间，这表明需要进一步的工作来了解底栖沉积物给料器对氮的利用。 δ〜（13）C和δ〜（15）N的营养行会（捕食者，捕食者-清除剂，表面沉积物进料器，地下沉积物进料器和悬浮物进料器）的差异是明显的，而移动捕食者-清除剂和底栖沉积物喂食器。根据营养行会的组合将食物链分为植物残渣（沉积物和悬浮饲料）和捕食（鱼类和甲壳类动物），导致δ〜（15）N和δ〜（13）C呈强正相关两个站。这些反映了有机质通过沉积物给料器，掠食性和清除深海鱼类和甲壳类动物的两种主要营养途径。

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