A Long-Term Perspective of Seasonal Shifts in Nutrient Dynamics and Eutrophication in the Romanian Black Sea Coast

Elena Ristea, Elena Bisinicu, Vasile Lavric, Oana Cristina Parvulescu and Luminita Lazar ()
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Elena Ristea: Chemical Oceanography and Marine Pollution Department, National Institute for Marine Research and Development “Grigore Antipa”, 300 Mamaia Boulevard, 900581 Constanta, Romania
Elena Bisinicu: Ecology and Marine Biology Department, National Institute for Marine Research and Development “Grigore Antipa”, 300 Mamaia Boulevard, 900581 Constanta, Romania
Vasile Lavric: IOSUD Politehnica Bucharest, Doctoral School “Chemical Engineering and Technologies”, 1-7, Gheorghe Polizu, 011061 Bucharest, Romania
Oana Cristina Parvulescu: IOSUD Politehnica Bucharest, Doctoral School “Chemical Engineering and Technologies”, 1-7, Gheorghe Polizu, 011061 Bucharest, Romania
Luminita Lazar: Chemical Oceanography and Marine Pollution Department, National Institute for Marine Research and Development “Grigore Antipa”, 300 Mamaia Boulevard, 900581 Constanta, Romania

Sustainability, 2025, vol. 17, issue 3, 1-27

Abstract: This study investigates the long-term seasonal shifts in nutrient dynamics and eutrophication processes in the Romanian Black Sea coastal waters using multi-decadal data (1960/1976/1980–2023). The findings highlight significant seasonal and interannual changes, revealing a progressive rise in seawater temperature, declining oxygen concentrations, and notable shifts in nutrient stoichiometry, particularly an increasing nitrogen–phosphorus (N:P) ratio. These changes are closely associated with increased occurrences of harmful algal blooms ( Noctiluca scintillans ), emphasizing the complex relationship between warming, nutrient and dissolved oxygen cycles, and biological activity. Seasonal patterns show that prolonged warmer periods, especially during autumn, exacerbate oxygen depletion and nutrient imbalances, with implications for marine life and food webs. The study underscores the importance of targeted nitrogen reduction strategies, including optimized fertilizer use, improved wastewater treatment, and the establishment of buffer zones to minimize land-based nutrient inputs. Regional cooperation and integrated coastal management aligned with the Marine Strategy Framework Directive are essential for mitigating eutrophication. The results provide critical insights into the impacts of climate change on the Black Sea ecosystems. This research contributes to global efforts under SDG 13 (Climate Action), SDG 14 (Life Below Water), and SDG 3 (Good Health and Well-being), addressing the key challenges to marine biodiversity, water quality, and ecosystem sustainability.

Keywords: nutrients; climate change; Black Sea; eutrophication; SDGs; sustainability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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