Heterotrophic consumption may mask increasing primary production fuelled by anthropogenic nutrient loading in the northern Arabian/Persian Gulf
| Autor: | Hadeel Almansouri, Loreta Fernandes, Rakhesh Madhusoodhanan, Raziya Kedila, Kholood Al-Rifaie, S. Wajih A. Naqvi, Faiza Al-Yamani, Ayaz Ahmed, Turki Al-Said |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Chlorophyll chemistry.chemical_element 010501 environmental sciences Aquatic Science Oceanography Oxygen minimum zone 01 natural sciences chemistry.chemical_compound Nutrient Nitrate Rivers Phytoplankton Seawater Biomass Indian Ocean 0105 earth and related environmental sciences 010604 marine biology & hydrobiology Phosphorus Hypoxia (environmental) Nutrients Pollution Oxygen Productivity (ecology) chemistry Kuwait Environmental chemistry Environmental science Seasons Eutrophication |
| Zdroj: | Marine pollution bulletin. 148 |
| ISSN: | 1879-3363 |
| Popis: | Monthly measurements of nitrate, nitrite, ammonium and phosphate at three stations off Kuwait during 2002-2015 revealed considerable inter-annual variability, broadly corresponding to fluctuations in the Shatt-al-Arab River discharge, but a lack of secular increasing trend. Nutrient enrichment experiments during two seasons revealed nitrate uptake, chlorophyll build-up and growth of micro-phytoplankton, even in the presence of ammonium, provided the availability of phosphate. Primary production was mostly nitrogen limited, but anthropogenic nitrogen supply may eventually make it phosphorus limited, especially in summer and in the open Gulf. Anthropogenic nutrient inputs appear to have enhanced biological productivity of the northern Gulf, but heterotrophic consumption, indicated by high respiration rates, probably prevented accumulation of phytoplankton biomass, accounting for the observed lack of chlorophyll increase over the past three decades. Consequently high total organic carbon and emerging hypoxia in the Gulf may lead to expansion/intensification of the oxygen minimum zone of the Arabian Sea. |
| Databáze: | OpenAIRE |
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