Background

Climate changes influence the ecosystems and induce potential risks regarding the natural products and services; the human society should predict and adapt in time to these coming global challenges. This research highlights a possible fragmentation of some of the Lower Danube River Basin lentic ecosystems fish populations in a climate change scenario.

Results

The studied climate change potential events will affect 18 fish species of economic interest and eight of conservation interest and will induce disorder in some of the Lower Danube specific type of fish communities. The studied area was identified as a significant hot spot regarding the fish fauna ecological status major hazard, in a possible climate change (heating–drought–water depth decreasing) sequence of potential future events. Primarily the southern lakes of the studied area can be negatively influenced by the decreasing of the lakes water quality and quantity, some of the spawning habitats will vanish, some habitats and species will disappear, suspended sediment and nutrient levels in water will increase, eutrophication phenomenon will increase, the hydrological connectivity will diminish, fish associations’ structure will significantly change, etc.

Conclusions

The climate changes trend in the Lower Danube Basin will affect the studied lakes ecological state and associated fish communities; mitigating measures are urgently needed. The future potential relative isolation of researched lakes by the surrounding hydrographical nets, for safety reasons of human communities or to convert inland areas should be banned specially for the lakes: Balta Domnească, Razelm, Tăbăcărie, Siutghiol, Taşaul, Tatlageac, Sinoe, Potcoava, Snagov, Comana, Victoria Gheormane, Dunărea Veche, Oltina, and Bugeac. Some of the researched lakes should be managed as wetlands of international importance and as important stepping stone areas for the fish fauna of the Danube Basin: Snagov, Comana, Victoria Gheormane, Dunărea Veche, Oltina, and Bugeac.

中文翻译：

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自然和人为驱动力是下多瑙河盆地–东南喀尔巴阡山脉–西北黑海沿岸湖泊中的关键要素：在气候变化的情况下，鱼类的垫脚石被打碎了吗？

背景

气候变化影响生态系统，并引发有关天然产品和服务的潜在风险；人类社会应该及时预测并适应这些即将到来的全球挑战。这项研究强调了在气候变化情景下多瑙河下游流域透镜状生态系统鱼类种群可能的破碎化。

结果

研究的气候变化潜在事件将影响18个具有经济利益的鱼类和8个具有保护意义的鱼类，并将在下多瑙河某些特定类型的鱼类群落中引起混乱。在潜在的未来事件可能的气候变化（加热-干旱-水深减少）序列中，研究区域被确定为关于鱼类生态系统主要危害的重要热点。所研究地区的南部湖泊主要受到湖泊水质和水量下降的负面影响，一些产卵的栖息地将消失，某些栖息地和物种将消失，水中的悬浮沉积物和养分水平将增加，发生富营养化现象。将会增加，水文连通性将会减少，

结论

下多瑙河盆地的气候变化趋势将影响所研究的湖泊的生态状况和相关的鱼类群落。迫切需要缓解措施。出于人类社区的安全考虑或为了转换内陆地区，未来应禁止周围的水文网对研究的湖泊进行潜在的相对隔离，特别是针对以下湖泊：巴尔塔·多姆内斯卡，拉泽尔姆，塔贝卡里，Siutghiol，塔索尔，塔塔拉吉亚克，西诺，波科瓦， Snagov，Comana，Victoria Gheormane，DunăreaVeche，Oltina和Bugeac。一些被研究的湖泊应作为具有国际重要性的湿地进行管理，并应作为多瑙河盆地鱼类区系的重要垫脚石区域进行管理：Snagov，Comana，Victoria Gheormane，DunăreaVeche，Oltina和Bugeac。