Alteration of organic matter during infaunal polychaete gut passage and links to sediment organic geochemistry. Part II: Fatty acids and aldoses
Alteration of organic matter during infaunal polychaete gut passage and links to sediment organic geochemistry. Part II: Fatty acids and aldoses
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动物体内多毛类肠道通道过程中有机物的变化及其与沉积物有机地球化学的联系。
DOI：
10.1016/j.gca.2014.02.013
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发表时间：
2014
影响因子：
5
通讯作者：
Woulds C
中科院分区：
文献类型：
--
作者：
Woulds C
已知沉积物动物的活动影响有机物在海洋沉积物中循环的速度和途径，从而影响有机碳的最终埋藏或腐烂。然而，由于方法上的限制，动物肠道通道的作用，在确定随后的组成，从而有机物的降解性是相对较少的研究。以往对底栖动物消化有机物的研究无法检测动物组织中特定生化物质的吸收和保留，而且持续时间太短，无法适应更长时间的消化，因此，本研究的目的是调查在肠道通过丰富和普遍存在的多毛类Hediste发生的有机物的醛糖和脂肪酸组成的变化diversicolorandArenicola marina，并将这些与有机物腐烂过程中观察到的长期变化联系起来，这一目标通过微宇宙实验来实现，在实验中，选择多毛类动物喂食13 C标记的藻类碎屑，并在3个时间点对生物体、沉积物和粪便颗粒进行采样，时间超过16周。利用GC-MS和GC-IRMS分析了样品的~（13）C标记的醛糖和脂肪酸含量。观察到多毛类动物组织中生物化学物质的化合物选择性净积累，无论是醛糖还是脂肪酸，这种模式具有分类特异性。主要模式包括葡萄糖和多不饱和脂肪酸的整体损失;和优先保存或生产阿拉伯糖，微生物化合物（鼠李糖，岩藻糖和微生物脂肪酸），和动物合成的脂肪酸。这些模式可能是由脂肪酸的必需性、葡萄糖的优先代谢和A. marinagrazing对细菌。脂肪酸套房沉积物中的动物群的缩影表现出更大比例的饱和脂肪酸和细菌标记物比那些从动物控制。醛糖套件的改变是类似的动物区系的缩影和动物区系的控制，但动物区系的肠道通道沉积醛糖组合物的影响，可以观察到在较长的时间尺度。因此，这项研究提供了直接的证据表明，多毛类动物肠道通道影响OM组成，通过分类特异性选择性同化和保留在多毛类动物组织，也通过与微生物群落的相互作用。
The activities of sediment-dwelling fauna are known to influence the rates of and pathways through which organic matter is cycled in marine sediments, and thus to influence eventual organic carbon burial or decay. However, due to methodological constraints, the role of faunal gut passage in determining the subsequent composition and thus degradability of organic matter is relatively little studied. Previous studies of organic matter digestion by benthic fauna have been unable to detect uptake and retention of specific biochemicals in faunal tissues, and have been of durations too short to fit digestion into the context of longer-term sedimentary degradation processes.Therefore this study aimed to investigate the aldose and fatty acid compositional alterations occurring to organic matter during gut passage by the abundant and ubiquitous polychaetesHediste diversicolorandArenicola marina, and to link these to longer-term changes typically observed during organic matter decay.This aim was approached through microcosm experiments in which selected polychaetes were fed with13C-labelled algal detritus, and organisms, sediments, and faecal pellets were sampled at three timepoints over ∼6 weeks. Samples were analysed for their13C-labelled aldose and fatty acid contents using GC–MS and GC–IRMS.Compound-selective net accumulation of biochemicals in polychaete tissues was observed for both aldoses and fatty acids, and the patterns of this were taxon-specific. The dominant patterns included an overall loss of glucose and polyunsaturated fatty acids; and preferential preservation or production of arabinose, microbial compounds (rhamnose, fucose and microbial fatty acids), and animal-synthesised fatty acids. These patterns may have been driven by fatty acid essentiality, preferential metabolism of glucose, andA. marinagrazing on bacteria.Fatty acid suites in sediments from faunated microcosms showed greater proportions of saturated fatty acids and bacterial markers than those from afaunal controls. Aldose suite alterations were similar in faunated microcosms and afaunal controls, however the impact of faunal gut passage on sedimentary aldose compositions may be observable over longer timescales. Therefore this study provides direct evidence that polychaete gut passage influences OM composition both through taxon-specific selective assimilation and retention in polychaete tissues, and also through interactions with the microbial community.
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DOI：
10.1017/s0025315400034330
发表时间：
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影响因子：
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作者：
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