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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Linking behaviours, sediment reworking, bioirrigation and oxygen dynamics in a soft-bottom ecosystem engineer: The mud shrimp Upogebia pusilla (Petagna 1792)
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Linking behaviours, sediment reworking, bioirrigation and oxygen dynamics in a soft-bottom ecosystem engineer: The mud shrimp Upogebia pusilla (Petagna 1792)

机译：在软底生态系统工程师中连接行为，沉积物再加工，生物镜和氧动力学：泥虾Upogebia Pusilla（Petagna 1792）

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Despite the role of bioturbation in controlling biogeochemical processes taking place at the sediment-water interface, little is still known about how animal behaviours influence sedimentary biogeochemical processes. In the present work, we used the mud shrimp Upogebia pusilla as model organism to assess the effect of behaviour types/intensities on sediment reworking, bioirrigation and sediment oxygen dynamics based on three sets of seasonal experiments. We identified four main behaviours: "Resting", "Walking", "Ventilating" and "Burrowing". Mud shrimp were much more active (Le., not "Resting") during summer than during winter and to a lesser extent spring due to elevated temperature. There were three distinct components of sediment reworking. The first one consisted in the expulsion of sediment particles from the burrow to the sediment-water interface, the second one to the transfer of sediment downward within the burrow and the third one to the transport and compaction of sediment across burrow walls. Temporal changes in the intensities of all components correlated tightly since they all resulted from "Burrowing". The temporal dynamics of porewater exchange and oxygen dynamics were clearly discontinuous and in direct relation with "Ventilating". However, other behaviours, and especially "Burrowing" were also involved in the control of this dynamics through the modulation of oxygen availability within the burrow, which is cuing the onset of ventilation at a 12-25% saturation threshold. These results underline the importance of taking into account changes in animal behaviour types/intensities at the appropriate temporal scales when assessing the impact of bioturbation on biogeochemical processes taking place at the sediment-water interface.
机译：尽管生物相关在控制沉积物 - 水界面进行的生物地球化学过程中的作用，但仍然仍然知道动物行为如何影响沉积生物地球化学过程。在目前的工作中，我们使用泥虾Upogebia pusilla作为模型生物，以评估行为类型/强度基于三套季节性实验的沉积物垫料，生物辐射和沉积物氧动力学的影响。我们确定了四种主要行为：“休息”，“走路”，“通风”和“挖掘”。在夏天，泥虾比在冬季和较小的温度下弹簧，泥浆虾更活跃（LE。，而不是“休息”）。沉积物重新加工有三个不同的组分。第一个组成，将沉积物颗粒从洞穴驱逐到沉积物 - 水界面，第二个是在洞穴内向下转移沉淀物和第三个到洞穴墙上的沉积物的传输和压实。所有组件的强度的时间变化紧紧相关，因为它们都是由“挖掘机”产生的。沉积物交换和氧动力学的时间动态明显不连续，与“通风”直接关系。然而，其他行为，特别是“挖掘”也通过调制钻头内的氧可用性来控制这种动态，这在12-25％饱和阈值下的通气发作。这些结果强调了在评估生物干扰对沉积物 - 水界面发生的生物地球化学过程的影响时，考虑到适当的时间尺度的动物行为类型/强度变化的重要性。

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