Enhanced Productivity and Fish Abundance at a Submarine Spring in a Coastal Lagoon on Tahiti, French Polynesia
Enhanced Productivity and Fish Abundance at a Submarine Spring in a Coastal Lagoon on Tahiti, French Polynesia
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法属波利尼西亚塔希提岛沿海泻湖海底泉水的生产力和鱼类丰度得到提高
DOI：
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发表时间：
2020
影响因子：
3.7
通讯作者：
N. Moosdorf
中科院分区：
文献类型：
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作者：
C. Starke;W. Ekau;N. Moosdorf
海底地下水排放（SGD）是将地下水直接排入海洋的一种方式，在全球范围内储量丰富。新鲜的SGD可以在海底温泉中集中流动。然而，人们对海底弹簧对海洋生物的影响知之甚少。为了更好地了解SGD与其周围生物之间的相互作用，我们在法属波利尼西亚塔希提岛的一个沿海泻湖调查了SGD对鱼类丰度的影响。这项研究是基于这样一种假设，即由于陆地地下水向海洋提供的养分增加，生物产量会增加。生物污染过程和浮游动物样本被用作海底弹簧导致的营养输入增加的指标。主要目的是调查对鱼类丰度的影响，假设较高的鱼类丰度可能由自下而上的控制引起。所提供的数据显示，海底泉水周围的丰度明显较高，暴露于地下水排放的藻类草坪的生长也明显较大。对浮游动物的评估表明，海底泉水周围的浮游动物数量略高。结果表明，通过海底泉传播的营养物质浓度升高可能引起自下而上的控制，导致所调查的海底泉周围的鱼类丰度更高。
Submarine groundwater discharge (SGD), the direct discharge of groundwater into the sea, is abundant around the globe. Fresh SGD can occur as focused flow in submarine springs. However, little is known on the impact of submarine springs on marine organisms. For a better understanding of the interaction between SGD and its surrounding organisms, the impact of SGD on the abundance of fish was investigated in a coastal lagoon of Tahiti, French Polynesia. The study is based on the assumption of an enhanced biological production due to increased amounts of nutrient input caused by terrestrial groundwater supply into the sea. Biofouling processes and zooplankton samples were used as indicators for elevated nutrient input due to submarine springs. The main objective was to investigate the effect on the abundance of fish assuming a higher fish abundance possibly caused by a bottom-up control. Presented data show a significantly higher abundance around a submarine spring as well as significantly larger growth of algal turfs exposed to groundwater discharge. Zooplankton evaluations suggest slightly higher abundances around the submarine spring. The results suggest elevated nutrient concentrations transmitted by submarine springs may cause a bottom-up control resulting in a higher abundance of fish around the investigated submarine spring.