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首页> 外文期刊>Botanica Marina >Linking macroalgal delta N-15-values to nitrogen sources and effects of nutrient stress on coral condition in an upwelling region
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Linking macroalgal delta N-15-values to nitrogen sources and effects of nutrient stress on coral condition in an upwelling region

机译：将大型藻类δN-15值与氮源联系起来，以及营养胁迫对上升流区珊瑚状况的影响

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Land-based sewage pollution is a major threat to the health of near-shore coral reefs. Macroalgal delta N-15-values are useful indicators for tracking nitrogen sources and sewage input; however, the direct link between delta N-15-values of macroalgae and the coral condition, including live coral cover, species richness, and juvenile coral density, is unclear. Macroalgal delta N-15-values of two species, Lobophora variegata and Tricleocarpa oblongata, were measured in Wenchang (northeast Hainan Island, South China Sea) in both the dry and wet seasons, to assess the influence of nitrogen sources and nutrient stress resulting from sewage input or upwelling on the condition of corals. Macroalgal delta N-15-values showed that shallow stations between the reef and the coast were severely affected by sewage input (e.g., river discharges and aquaculture ponds), whereas deep stations on the outside of the reef were influenced by upwelling-based nutrients. Correlation and redundancy analysis demonstrated that delta N-15-values of L. variegata had a stronger relation with coral condition than any other environmental parameter (e.g., water quality index, turbidity, and dissolved nutrients), with significant negative correlations in both the dry and wet seasons. Thus, macroalgal delta N-15-values can be used to determine where nutrient stress is negatively affecting corals, highlighting the links of human activities and coastal upwelling with marine ecosystems.
机译：陆上污水污染是对近岸珊瑚礁健康的重大威胁。宏观藻类的N-15值是跟踪氮源和污水输入的有用指标;然而，尚不清楚大型藻类的δN-15值与珊瑚状况（包括活珊瑚覆盖率，物种丰富度和幼稚珊瑚密度）之间的直接联系。在干湿季节，在文昌（海南岛东北部，南海）在文昌测量了两个物种，杂色罗汉果和长叶锦鸡儿的大型藻类N-15值，以评估氮源和养分胁迫的影响。在珊瑚条件下的污水输入或上升流。宏观藻类的N-15值表明，礁石和海岸之间的浅水站受到污水输入的严重影响（例如，河水排放和水产养殖池塘），而礁石外部的深水站受到上升流中养分的影响。相关性和冗余度分析表明，杂色乳酸杆菌的N-15值与珊瑚状况的关系比其他任何环境参数（例如，水质指数，浊度和溶解的养分）都更强，而在干燥状态下均具有显着的负相关性和雨季。因此，大型藻类的N-15值可用于确定营养压力在哪里对珊瑚产生负面影响，从而突出人类活动和沿海上升流与海洋生态系统之间的联系。

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