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Abstract

Rivers are exposed to global warming and eutrophication, which in turn affect phytoplankton biomass in rivers. This study investigates the changes in Chl-a concentration, an indicator of phytoplankton biomass. A microcosm experiment was conducted, with water sampling from the Tigris River in Baghdad during the wet season. Temperature increase was based on raising the temperature by 3 °C higher than the ambient temperature, while nutrient enrichment was based on the mean values of soluble reactive NO3-1 and PO4-3 verified in the Tigris River. Variations in Chl-a concentration are associated with changes in WT and nutrient enrichment; NO3-1 and PO4-3. Our results showed that the Chl-a concentration was 0.8 μg/l in the control microcosm. Temperature increase led to an increase in Chl-a of Temperature microcosm 1 μg/l, enrichment of nutrient, in turn, led to an increase in Chl-a of NO3-1 and PO4-3 microcosms to 1.2 and 0.8 μg/l, respectively, so the temperature increase and nutrient enrichment together led to a greater increase in Chl-a of T+NO3-1 and T+PO4-3 microcosms 1.2 and 1.1 μg/l, respectively, than if it were a single effect, which constitutes the highest concentration of Chl-a during the experiment. The effects of temperature and/ or nutrient can change the concentration of Chl-a. Nutrient enrichment. NO3-1 and PO4-3, were identified as key contributors to Chl-a concentration, while warming influences the growth of Chl-a by enhancing metabolic and photosynthetic processes under nutrient-enriched conditions.

Keywords

Chlorophyll-a, Nutrient enrichment, Phytoplankton, Temperature increase, Tigris river

Subject Area

Biology

Article Type

Article

First Page

2047

Last Page

2055

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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