Karadeniz Technical University, Institute of Marine Sciences and Technology, 61080, Trabzon, Turkey.
Central Fisheries Research Institute, 61250, Yomra, Trabzon, Turkey.
Chemosphere. 2022 Sep;302:134809. doi: 10.1016/j.chemosphere.2022.134809. Epub 2022 May 1.
In this study, the nutrient concentrations along the coastal region of the Southeastern Black Sea were evaluated based on temporal, spatial, and vertical distributions. The water samples were collected seasonally in 2013 from 432 depths covering 55 stations. The nutrient concentrations showed significant spatial and temporal variations that declined abruptly from shore to offshore. The stations near the river discharge had the highest silicate, nitrate, and total dissolved inorganic nitrogen (DIN). The highest nitrate concentrations were determined within the oxycline layer and nitrite within the suboxic layer, while phosphate, ammonium, silicate, and DIN were within the anoxic layer. The findings of this study evinced that the Southeastern Black Sea possessed lower contents of nitrate (mean ± s.d., 0.58 ± 1.17 μM), phosphate (0.12 ± 1.00 μM), than the literature values reported for the western Black Sea, but consistent to the eastern Black Sea. However, the silicate concentrations of the study area were consistent with the western Black Sea while higher than the eastern Black Sea. The Trophic Index showed that two stations located on the coast of the Samsun and Giresun were at increased risk of eutrophication due to intensive urban and industrial inputs. This study provides detailed insights on the nutrient status of the coastal Southeastern Black Sea, which should facilitate the development of long-term monitoring programs concerning environmental aspects of marine and coastal planning.
在这项研究中，根据时间、空间和垂直分布，评估了黑海东南部沿海地区的营养物浓度。于 2013 年从 55 个站位的 432 个深度采集了季节性水样。营养物浓度显示出显著的时空变化，从岸到近海急剧下降。靠近河流排放口的站位硅酸盐、硝酸盐和总溶解无机氮（DIN）含量最高。在氧化层中检测到最高的硝酸盐浓度，在亚缺氧层中检测到亚硝酸盐浓度，而磷酸盐、铵盐、硅酸盐和 DIN 则在缺氧层中。本研究结果表明，黑海东南部的硝酸盐（平均值±标准差，0.58±1.17μM）、磷酸盐（0.12±1.00μM）含量低于文献中报道的西部黑海值，但与东部黑海值一致。然而，研究区域的硅酸盐浓度与西部黑海一致，高于东部黑海。营养指数显示，由于城市和工业的密集输入，位于萨姆松和格里兹地区海岸的两个站位处于富营养化的高风险中。本研究提供了黑海东南部沿海地区营养状况的详细信息，这将有助于制定有关海洋和沿海规划环境方面的长期监测计划。
