Wupeng Xiao1, Xin Liu1, Andrew J Irwin2, Edward A Laws3, Lei Wang1, Bingzhang Chen4, Yang Zeng1, Bangqin Huang5. 1. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China; Key Laboratory of Coastal and Wetland Ecosystems, Ministry of Education/Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, Xiamen University, Xiamen, China. 2. Department of Mathematics & Computer Science, Mount Allison University, Sackville, New Brunswick, Canada. 3. Department of Environmental Sciences, School of the Coast & Environment, Louisiana State University, Baton Rouge, LA, 70803, USA. 4. Ecosystem Dynamics Research Group, Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan. 5. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China; Key Laboratory of Coastal and Wetland Ecosystems, Ministry of Education/Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, Xiamen University, Xiamen, China. Electronic address: bqhuang@xmu.edu.cn.
Abstract
Temperature change and eutrophication are known to affect phytoplankton communities, but relatively little is known about the effects of interactions between simultaneous changes of temperature and nutrient loading in coastal ecosystems. Here we show that such interaction is key in driving diatom-dinoflagellate dynamics in the East China Sea. Diatoms and dinoflagellates responded differently to temperature, nutrient concentrations and ratios, and their interactions. Diatoms preferred lower temperature and higher nutrient concentrations, while dinoflagellates were less sensitive to temperature and nutrient concentrations, but tended to prevail at low phosphorus and high N:P ratio conditions. These different traits of diatoms and dinoflagellates resulted in the fact that both the effect of warming resulting in nutrients decline as a consequence of increasing stratification and the effect of increasing terrestrial nutrient input as a result of eutrophication might promote dinoflagellates over diatoms. We predict that conservative forecasts of environmental change by the year 2100 are likely to result in the decrease of diatoms in 60% and the increase of dinoflagellates in 70% of the surface water of the East China Sea, and project that mean diatoms should decrease by 19% while mean dinoflagellates should increase by 60% in the surface water of the coastal East China Sea. This analysis is based on a series of statistical niche models of the consequences of multiple environmental changes on diatom and dinoflagellate biomass in the East China Sea based on 2815 samples randomly collected from 23 cruises spanning 14 years (2002-2015). Our findings reveal that dinoflagellate blooms will be more frequent and intense, which will affect coastal ecosystem functioning.
Temperature change and eutrophication are known to affect phytoplankton communities, but relatively little is known about the effects of interactions between simultaneous changes of temperature and nutrient loading in coastal ecosystems. Here we show that such interaction is key in driving diatom-dinoflagellate dynamics in the East China n class="Gene">Sea. Diatoms and dinoflagellates responded differenpan>tly to temperature, nutrienpan>t concenpan>trations and ratios, and their interactions. Diatoms preferred lower temperature and higher nutrienpan>t concenpan>trations, while dinoflagellates were less senpan>sitive to temperature and nutrienpan>t concenpan>trations, but tenpan>ded to prevail at low n class="Chemical">phosphorus and high N:P ratio conditions. These different traits of diatoms and dinoflagellates resulted in the fact that both the effect of warming resulting in nutrients decline as a consequence of increasing stratification and the effect of increasing terrestrial nutrient input as a result of eutrophication might promote dinoflagellates over diatoms. We predict that conservative forecasts of environmental change by the year 2100 are likely to result in the decrease of diatoms in 60% and the increase of dinoflagellates in 70% of the surface water of the East China Sea, and project that mean diatoms should decrease by 19% while mean dinoflagellates should increase by 60% in the surface water of the coastal East China Sea. This analysis is based on a series of statistical niche models of the consequences of multiple environmental changes on diatom and dinoflagellate biomass in the East China Sea based on 2815 samples randomly collected from 23 cruises spanning 14 years (2002-2015). Our findings reveal that dinoflagellate blooms will be more frequent and intense, which will affect coastal ecosystem functioning.
Authors: Rui He; Huan Luo; Ning He; Wenlong Chen; Fang Yang; Weijie Huang; Ning Li; Lingling Sun; Songyao Peng Journal: Int J Environ Res Public Health Date: 2022-06-24 Impact factor: 4.614