Marine Biology ( IF 2.1 ) Pub Date : 2023-12-13 , DOI: 10.1007/s00227-023-04344-8 L. Buhl-Mortensen , R. Houssa , B. M’bengue , E. S. Nyadjro , D. Cervantes , M. Idrissi , E. Mahu , A. S. Dia , M. Olsen , C. Mas , M. Chierici
The health status of cold-water coral reefs on the West African coast was investigated with the main objective of obtaining knowledge of the adaptive capacity of Lophelia pertusa to environmental stressors. Three coral sites were studied, in Northern Morocco, in the Morocco/Mauritania region (both in 2020) and, in the Ghana and Ivory coast region (visited in 2012, 2017, and 2019). Area cover of live colonies, explored through underwater videos, was used as an indicator of reef health and compared with the environmental variables: reef position, depth, water mass, temperature, dissolved oxygen concentration (DO), carbonate chemistry (pH, aragonite saturation (ΩAr), macronutrients and particles (visual). For a broader picture of the adaptations presented by Lophelia our results were compared with reefs in contrasting environments. Off Ghana and Mauritania healthy reefs (i.e., having areas with more than 20 % cover of live colonies) were found to reside at DO concentrations between 1.1 and 1.6 ml L−1, in corrosive waters (pH 7.7 and ΩAr 1.0) with high nutrient concentrations. By contrast, the reefs off the North of Morocco, sitting in well-oxygenated waters with oversaturated ΩAr, had no or few live colonies. Our findings together with data from other studies show that Lophelia has a wide tolerance to hypoxia and acidification, and that in relation to climate change increased temperature and silting could pose more serious threats. These findings highlight the importance of continued studies of Lophelia reefs in contrasting environmental conditions to better understand their adaptation potential to climate change-related stressors.
中文翻译:
北非和西非附近的 Lophelia 珊瑚礁——环境与健康比较
对西非海岸冷水珊瑚礁的健康状况进行了调查,主要目的是了解Lophelia pertusa对环境压力的适应能力。对摩洛哥北部、摩洛哥/毛里塔尼亚地区(均于 2020 年)以及加纳和象牙海岸地区(于 2012 年、2017 年和 2019 年访问)的三个珊瑚地点进行了研究。通过水下视频探索活菌群的面积覆盖率,作为珊瑚礁健康状况的指标,并与环境变量进行比较:珊瑚礁位置、深度、水量、温度、溶解氧浓度 (DO)、碳酸盐化学成分(pH、文石饱和度) (ΩAr)、宏量营养素和颗粒(视觉)。为了更全面地了解Lophelia所呈现的适应情况,我们将结果与对比环境中的珊瑚礁进行了比较。加纳和毛里塔尼亚附近的健康珊瑚礁(即,活珊瑚礁覆盖率超过 20% 的区域)菌落)被发现存在于 DO 浓度在 1.1 至 1.6 ml L -1之间、具有高营养浓度的腐蚀性水域(pH 7.7 和 ΩAr 1.0)中。相比之下,摩洛哥北部的珊瑚礁位于氧合良好的水域中ΩAr 过饱和,没有或很少有活菌落。我们的发现与其他研究的数据一起表明Lophelia对缺氧和酸化具有广泛的耐受性,并且与气候变化相关的温度升高和淤积可能会造成更严重的威胁。这些发现强调了继续研究洛菲利亚珊瑚礁对比环境条件的重要性,以更好地了解它们对气候变化相关压力源的适应潜力。