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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of preservation on the δ~(13)C and δ~(15)N values of deep sea macrofauna
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Effects of preservation on the δ~(13)C and δ~(15)N values of deep sea macrofauna

机译：保存对深海大型动物的δ〜（13）C和δ〜（15）N值的影响

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摘要

The aim of the present study was to quantify the effect of formalin-ethanol preservation on the carbon and nitrogen stable isotope values of five deep-sea species (Abra longicallus, Molpadia musculus, Sipunculus norvegicus, Chirimia biceps and Nephthys hystricis). To examine temporal changes in the effects of preservation and to determine if preservation induces predictable shifts in δ~(13)C and δ~(15)N values, analyses were carried out after 1, 6 and 12 months of preservation. The data indicated variable effects on carbon and nitrogen isotope values among species after formalin and ethanol preservation. Formalin fixation did not affect 6~(15)N values of any of the five species analysed, while it did affect δ~(13)C values, with a depletion trend observed in all of the species. In general ethanol preservation did not affect nitrogen values for up to 6 months of preservation, and only the δ~(15)N values ofS. norvegicus became depleted after 12 months. Ethanol fixation only affected the carbon isotopic composition of M. musculus, with a progressive depletion from 1 to 12 months after preservation. Due to the different effects of preservation on stable isotope values, the use of a general and systematic correction factor was not possible. Since no effect on δ~(15)N values of either formalin or ethanol fixation is evident after 6 months, we recommend that these methods be used for short-term (<6 months) conservation and only if studies are focused on the identification of trophic levels. If changes in carbon and nitrogen isotopic values from long-preserved samples are to be used for reconstructing a food web, it is necessary to establish the effects of preservation in the whole spectrum of species evaluated.
机译：本研究的目的是量化福尔马林-乙醇保存对五个深海物种（Abra longicallus，Molpadia musculus，Sipunculus norvegicus，Chirimia biceps和Nephthys hystricis）的碳和氮稳定同位素值的影响。为了检查保存效果的时间变化并确定保存是否导致δ〜（13）C和δ〜（15）N值发生可预测的变化，在保存1、6和12个月后进行了分析。数据表明福尔马林和乙醇保存后对物种间碳氮同位素值的影响不同。福尔马林固定不影响所分析的五个物种中任何一个的6〜（15）N值，但确实影响δ〜（13）C值，并且在所有物种中均观察到消耗趋势。通常，乙醇保存长达6个月不会影响氮值，仅影响S的δ〜（15）N值。 12个月后，诺韦吉格斯耗尽。乙醇固定仅影响小家鼠的碳同位素组成，保存后1到12个月逐渐消耗。由于保存对稳定同位素值的不同影响，因此不可能使用通用的系统校正因子。由于6个月后对福尔马林或乙醇固定的δ〜（15）N值均无明显影响，因此我们建议将这些方法用于短期（<6个月）保存，并且仅当研究集中于鉴定营养级。如果要将长期保存的样品中碳和氮同位素值的变化用于重建食物网，则必须在整个评估物种中建立保存的效果。

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