Downwelling and deep-water bottom currents as food supply mechanisms to the cold-water coral Lophelia pertusa (Scleractinia) at the Mingulay Reef complex
Downwelling and deep-water bottom currents as food supply mechanisms to the cold-water coral Lophelia pertusa (Scleractinia) at the Mingulay Reef complex
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DOI：
10.4319/lo.2009.54.2.0620
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发表时间：
2009-03-01
影响因子：
4.5
通讯作者：
Roberts, J. Murray
中科院分区：
文献类型：
--
作者：
Davies, Andrew J.;Duineveld, Gerard C. A.;Roberts, J. Murray
2006年和2007年，在着陆器和系泊处多次部署了海流计和光学传感器，这是对赫布里底海明古拉礁复合体中140米水深的珊瑚群落的颗粒供应进行的第一次详细的现场研究。解决了两种不同和可预测的供应机制。一种机制是由水力控制潮汐流引起的地表水快速下沉，在不到一小时的时间内将颗粒从表面输送到珊瑚。在洪水和退潮开始时，珊瑚礁顶部的快速下流被记录为温暖、荧光和相对清澈的水的脉冲。涨潮后的脉动最强，持续时间长达3h。第二种机制是高悬浮物负荷的深底水平流到礁石上。这种平流发生在潮汐高峰期，并与礁顶的地形水流加速相结合，增强了颗粒向珊瑚的输送。
In 2006 and 2007, multiple deployments of current meters and optical sensors on landers and moorings were made in the first detailed in situ study of the particle supply to the coral community in the Mingulay Reef complex in the Sea of Hebrides at 140-m water depth. Two distinct and predictable supply mechanisms were resolved. One mechanism consisted of the rapid downwelling of surface water caused by hydraulic control of tidal flow that transports particles from the surface to the corals in less than an hour. The rapid downwelling was recorded on the reef top as a pulse of warm, fluorescent, and relatively clear water at the onset of the flood and ebb tides. The pulse was strongest after flood tide and lasted for up to 3 h. The second mechanism consisted of advection onto the reef of deep bottom water with a high suspended matter load. This advection occurred during peak tides and was combined with topographical current acceleration on the reef top, enhancing delivery of particles to the corals.