Exogenous nutrient inputs restructure phytoplankton community and ecological stoichiometry of Eastern Indian Ocean

Ecological Indicators

Fangfang Li¹  Xue Yang¹  Yuping Zhou²  Ying Wang²  Jiangtao Wang³  Liju Tan⁴ 

[1] College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China;Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100, PR China;North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, PR China;Shandong Institute for Food and Drug Control, PR China;

关键词: Phytoplankton community;    Stoichiometry;    Nitrogen input;    Biodiversity;    C/N ratio;    Eastern Indian Ocean;   

DOI  :  

来源: DOAJ

【 摘 要 】

Exogenous nutrient inputs increasingly impact the structure and function of marine food weds through abiotic and biotic ways. The influence of nutrient inputs from atmospheric depositions and intermediate seawater supply on the phytoplankton growth and stoichiometry was studied in the Eastern Indian Ocean through multifactorial mesocosm experiments. Our results indicate that nitrogen inputs from atmospheric deposition and hydrodynamic processes did not only promote chlorophyll a biomass (5.3–58.52 μg·L-1) to increase the photosynthetically fixed carbon content but also generate a regime shift from picophytoplankton cyanobacteria to microphytoplankton diatom indicated by high relative abundance of microphytoplankton (>50%). These alternations of nutrient status and phytoplankton community structure reduced biodiversity of marine ecosystems (N-cultures, 0.18 to 0.56; control, 0.63) and generated the attendant C/N ratio of 5.6 ± 0.2 in cultures with nitrogen addition that was significantly lower than cultures with only phosphorus or iron addition. These results provide a thorough insight about the influence of nutrient inputs on marine biogeochemical cycle. Considering the universality of phytoplankton community alteration induced by exogenous nutrient inputs, integrating community compositions with phytoplankton stoichiometry may be helpful for clarify mechanisms of environment events impacting marine food weds.

【 授权许可】

Unknown