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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Choosing the lesser evil - A case study on quantification of sediment reworking rates in multi corer type sediment cores
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Choosing the lesser evil - A case study on quantification of sediment reworking rates in multi corer type sediment cores

机译：选择较小的罪恶 - 以多升型沉积物核算沉积物速率量化量化的案例研究

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摘要

Macrofaunal sediment reworking activity is a key driver of ecosystem functioning in marine systems. So far sediment reworking rates can only accurately be assessed by measurements as inference from community parameters is limited. In this case study we test the applicability of 2-D optical florescent sediment profile imaging (f-SPI) on multi corer type incubation cylinders. f-SPI has to date been applied to flat-surfaced (i.e. rectangular) cores only, while multi corer type incubation cylinders were analyzed by the spatially low resolved and invasive slicing technique. Here we apply both methods to cylindrical sediment cores (10 cm diameter). Cores were taken from by two common communities (i.e. Nucula-community and Amphiura-community) in the southern German Bight. Both f-SPI and the slicing technique showed similar vertical luminophore profiles. However the slicing technique found no significant differences between the two communities, whereas f-SPI showed significant differences for all investigated sediment reworking parameters: sediment reworking rate, non-locality index, mean weighted luminophore depth, and the maximal luminophore depth. Consequently, this may lead to different conclusions about the sediment reworking behaviors of the two communities. Likely the slicing method failed to detect significant differences between the Nucula- and Amphiura-community, owing to insufficient spatial accuracy. The f-SPI method, on the other hand, did not capture the full extent of maximal sediment reworking depth due to wall-effects. We conclude that both methods have specific drawbacks and advantages. While slicing is preferable when focusing on the absolute maximal sediment reworking depth especially with predominantly sessile communities, f-SPI is better suited to capture general sediment reworking patterns of most other communities. We demonstrate further that the bias, which is introduced by the distortion effect on imaging due to optical perspective and cylinder wall curvature of rounded cylinders using f-SPI, is negligible. Accordingly our results indicate that the distortion effects by curvature of the rounded cylinder walls will not cause underestimations of sediment reworking parameters in the f-SPI approach. Consequently f-SPI is suitable for the investigation of sediment reworking in natural communities by means of multi corer type samples.
机译：Macrofaunal沉积物重新加工活动是海洋系统中生态系统功能的关键驱动因素。到目前为止，沉积物重新加工率只能通过测量评估，因为来自社区参数的推断是有限的。在这种情况下，研究我们在多升式孵化缸上测试2-D光学荧光沉积物剖面（F-SPI）的适用性。 F-SPI必须仅应用于平面（即矩形）核心，而通过空间低分辨率和侵入性切片技术分析多升型孵育缸。在这里，我们将两种方法应用于圆柱形沉积物（直径10厘米）。在德国南部的两个常见社区（即Nucula-Community和Amphiura-Community）中取出了核心。 F-SPI和切片技术都显示出类似的垂直发光体剖面。然而，切片技术发现两个社区之间没有显着差异，而F-SPI对所有调查的沉积物的参数显示出显着差异：沉积物再加工率，非局部指数，平均加权发光深度和最大发光深度。因此，这可能导致对两个社区的沉积物的沉积物行为的不同结论。由于空间精度不足，切片方法可能未能检测到NUCULA和AMphiura社区之间的显着差异。另一方面，F-SPI方法没有由于壁效应而捕获最大沉积物垫料深度的全部最大程度。我们得出结论，两种方法都具有特定的缺点和优点。虽然在专注于绝对最大沉积物的重新加工深度尤其是主要的绝塞社区的绝对最大沉积物时，但F-SPI更适合捕获大多数其他社区的一般沉积物饰品模式。我们进一步证明了通过使用F-SPI的光学透视和圆柱形圆柱形的变形效应引入的偏差，这是可忽略不计的。因此，我们的结果表明，圆形圆筒壁的曲率的变形效应不会导致F-SPI方法中低估沉积物再加工参数。因此，F-SPI适用于通过多升式样品对天然社区中的沉积物再加工的研究。

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    Wrede Alexa; Holstein Jan; Brey Thomas;

  • 作者单位

    Helmholtz Ctr Polar & Marine Res Alfred Wegener Inst Handelshafen 12 D-27570 Bremerhaven Germany|Carl von Ossietzky Univ Oldenburg Helmholtz Inst Funct Marine Biodivers Oldenburg Germany|Univ Bremen Bibliothekstr 1 D-28359 Bremen Germany;

    Helmholtz Ctr Polar & Marine Res Alfred Wegener Inst Handelshafen 12 D-27570 Bremerhaven Germany|Carl von Ossietzky Univ Oldenburg Helmholtz Inst Funct Marine Biodivers Oldenburg Germany;

    Helmholtz Ctr Polar & Marine Res Alfred Wegener Inst Handelshafen 12 D-27570 Bremerhaven Germany|Carl von Ossietzky Univ Oldenburg Helmholtz Inst Funct Marine Biodivers Oldenburg Germany|Univ Bremen Bibliothekstr 1 D-28359 Bremen Germany;

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  • 正文语种 eng
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  • 关键词

    Bioturbation; Luminophore tracer technique; Sediment profile imaging;

    机译：生物扰动;发光电影示踪技术;沉积物剖面成像;

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