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首页> 外文期刊>Marine ecology progress series >In situ quantification of bioturbation using time-lapse fluorescent sediment profile imaging (f-SPI), luminophore tracers and model simulation
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In situ quantification of bioturbation using time-lapse fluorescent sediment profile imaging (f-SPI), luminophore tracers and model simulation

机译：使用延时荧光沉积物轮廓成像（f-SPI），发光体示踪剂和模型仿真对生物扰动进行原位定量

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In order to link actual biological data on bioturbation to the abstract parameters in bioturbation models, high-resolution data on the frequency and lengths of particle displacements are required. The temporal variation in bioturbation for a subtidal macrofaunal assemblage was studied non-invasively and in situ using an optically modified fluorescence sensitive time-lapse sediment profile imaging camera (f-SPI), fluorescent-dyed sediment particles (luminophores) and mathematical modelling. This combined approach allowed tracer particles to be non-invasively tracked and their displacements monitored at an unprecedented spatial (78 μm) and temporal (every 10 min) resolution for extended periods of time (16 h). The redistribution of luminophores was digitally acquired from sequential images and compared to model predictions, with particle transport modelled as (1) a diffusive process, allowing the biodiffusion coefficient, D_b, to be estimated, and (2) a non-local process, allowing a reworking activity constant, a, to be calculated. Model predictions of luminophore particle transport for the final image of the f-SPI sequence gave: D_b = 1.26 x 10~2 cm~2 yr~(-1); a = 5.23 x 10~(-2) cm~(-1) yr~(-1). Discrete values of a fluctuated widely throughout the sequence and allowed discrete bioturbation events to be identified. Time-lapse movie sequences revealed that most of the bioturbation observed during the deployment could be directly attributed to the behaviour of the brachyuran crab Hyas araneus. Our findings demonstrate that f-SPI provides a rapid and non-invasive means to visualise and quantify, in situ, the extent and influence of discrete infaunal bioturbation events on particle mixing. This technique provides detailed information on the spatial and temporal resolution of such bioturbation events, which could significantly improve existing models of bioturbation.
机译：为了将有关生物扰动的实际生物学数据与生物扰动模型中的抽象参数相关联，需要有关粒子位移频率和长度的高分辨率数据。潮汐大型动物群生物扰动的时间变化是采用光学修饰的荧光敏感时移沉积物轮廓成像相机（f-SPI），荧光染色的沉积物颗粒（发光体）和数学模型非侵入性和原位研究的。这种组合方法允许无创地跟踪示踪粒子，并以空前的空间（78μm）和时间（每10分钟）的分辨率监测示踪粒子的位移，时间延长（16 h）。从顺序图像中以数字方式获取发光体的重新分布，并将其与模型预测进行比较，其中颗粒传输的模型为：（1）扩散过程，可估计生物扩散系数D_b，（2）非局部过程，允许要计算的返工活动常数a。 f-SPI序列最终图像的发光体粒子传输模型预测给出：D_b = 1.26 x 10〜2 cm〜2 yr〜（-1）; a = 5.23 x 10〜（-2）cm〜（-1）yr〜（-1）。在整个序列中，离散值的波动很大，并且可以识别离散的生物扰动事件。延时电影序列显示，在部署过程中观察到的大多数生物扰动都可以直接归因于近岸蟹Hyas araneus的行为。我们的发现表明，f-SPI提供了一种快速且无创的手段，可以在现场可视化和量化离散的不良生物扰动事件对颗粒混合的程度和影响。该技术提供了有关此类生物扰动事件的时空分辨率的详细信息，这可以显着改善现有的生物扰动模型。

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