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首页> 外文期刊>Marine ecology progress series >Density-driven water exchange controls seasonal declines in jellyfish (Aurelia aurita) abundance in a shallow fjord system
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Density-driven water exchange controls seasonal declines in jellyfish (Aurelia aurita) abundance in a shallow fjord system

机译：密度驱动的水交换控制了浅峡湾系统中水母（Aurelia aurita）丰度的季节性下降

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摘要

The common jellyfish Aurelia aurita s.l. occurs in many coastal and shelf sea environments around the world, including fjord systems such as Kerteminde Fjord/Kertinge Nor (Denmark). As observed for the majority of temperate A. aurita populations, jellyfish appear in this fjord system each spring, go through gradual declines in their initially high abundance during summer/autumn and disappear by winter. While food limitation has been suggested to cause distinct seasonal declines in the local jellyfish abundance, the role of hydrodynamic forcing in the shallow, semi-enclosed fjord systemis still unclear. Based on a 2 yr field campaign, we provide a dynamic description for the density-driven water exchange in Kerteminde Fjord/Kertinge Nor to quantify the dispersal of jellyfish from the local population to adjacent coastal waters. The predicted mean residence time (+/- SD) of 45 +/- 1 d for the water masses in Kertinge Nor is in good agreement with an observed residence time of 41 +/- 7 d during which jellyfish abundance in the fjord system was reduced to e(-1) = 37%. These results indicate that major fractions of 86.7 +/- 8.9% and 82.6 +/- 7.9% of observed declines in jellyfish abundance in the fjord system were controlled by the density-driven water exchange during 2013 and 2014, respectively. Our findings emphasize the relevance of hydrodynamic processes in context with jellyfish blooms by ensuring dispersal of jellyfish source populations from semi-enclosed, potentially food-limited regions to open coastal waters.
机译：普通水母Aurelia aurita s.l.发生在世界各地许多沿海和陆架环境中，包括峡湾系统，例如Kerteminde Fjord / Kertinge Nor（丹麦）。正如对大多数温带金黄色葡萄球菌种群所观察到的，水母每年春天出现在该峡湾系统中，在夏季/秋季，其最初的高丰度逐渐下降，到冬季消失。虽然有人提出限制食物会引起当地水母丰度明显的季节性下降，但尚不清楚流体动力强迫在浅，半封闭的峡湾系统中的作用。基于为期2年的野外考察，我们对Kerteminde Fjord / Kertinge Nor中密度驱动的水交换进行了动态描述，以量化海el从当地居民向邻近沿海水域的扩散。克尔丁厄诺尔水体的预计平均停留时间（+/- SD）为45 +/- 1 d，与观察到的41 +/- 7 d的停留时间非常吻合，在此期间水母在峡湾系统中的丰度为减少到e（-1）= 37％。这些结果表明，在峡湾系统中观察到的水母丰度下降的主要部分分别为86.7 +/- 8.9％和82.6 +/- 7.9％，分别受密度驱动的水交换在2013年和2014年控制。我们的研究结果通过确保水母源种群从半封闭的，可能限制食物的区域散布到沿海开放水域中，强调了水动力过程与水母泛滥的相关性。

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