This study conducted four cruises during 2014–2017 to investigate relationships between macrobenthic communities and sediment contaminations in sea area around the Zhoushan Archipelago.Fourteen sites were categorized...This study conducted four cruises during 2014–2017 to investigate relationships between macrobenthic communities and sediment contaminations in sea area around the Zhoushan Archipelago.Fourteen sites were categorized into three groups:high total heavy metal contamination content(HHMC),high total petroleum hydrocarbon content(HTPH),and low content ratio of heavy metal contamination content to total petroleum hydrocarbon content(HMC/TPH)areas.Four main taxa of macrofauna(polychaetes,bivalves,gastropods,and crustaceans)were determined to respond to environmental factors differently.While tolerant polychaetes being the minimal impact by environmental factors,bivalves were threated by heavy metal pollutions in sediment.Additionally,body size distribution frequency demonstrated that macrofauna in the low HMC/TPH areas were less disturbed by contamination than those in the HHMC and HTPH areas.The result represented the presentation of sensitive species while tolerant species are usually considered as small size organisms.Overall,this study confirmed the hypothesis that the contamination levels of small-scale patches is indicated by the condition of macrobenthic communities.展开更多
This paper considers the asymptotic dynamics of steady states to the Lotka-Volterra competition diffusion systems with random perturbations by two-parameter white noise on the whole real line. By the fundamental solut...This paper considers the asymptotic dynamics of steady states to the Lotka-Volterra competition diffusion systems with random perturbations by two-parameter white noise on the whole real line. By the fundamental solution of heat equation, we get the asymptotic fluctuating behaviors near the stable states respectively. That is, near the steady state (u,v)=(0,1), the mean value Eu(x,t) is shifted above the equilibrium u=0 and Ev(x,t) is shifted below the equilibrium v=1. However, near the steady state (u,v)=(1,0), the mean value Eu(x,t) is shifted below the equilibrium u =1 and Eu(x,t)=0.展开更多
Summary What is already known on this topic?Iron deficiency(ID)is the most widespread micronutrient deficiency and have several adverse effects on health.Consequences of ID among children include delayed psychomotor d...Summary What is already known on this topic?Iron deficiency(ID)is the most widespread micronutrient deficiency and have several adverse effects on health.Consequences of ID among children include delayed psychomotor development and impaired cognitive performance,which makes it important to monitor the iron status of children.展开更多
基金he National Key Research and Development Program of China under contract No.2018YFD0900901the Scientific Research Fund of the Second Institute of Oceanography+2 种基金MNR under contract No.JG1916the Natural Science Foundation of Zhejiang Province under contract No.LQ19D060004the National Natural Science Foundation of China under contract No.41806181。
文摘This study conducted four cruises during 2014–2017 to investigate relationships between macrobenthic communities and sediment contaminations in sea area around the Zhoushan Archipelago.Fourteen sites were categorized into three groups:high total heavy metal contamination content(HHMC),high total petroleum hydrocarbon content(HTPH),and low content ratio of heavy metal contamination content to total petroleum hydrocarbon content(HMC/TPH)areas.Four main taxa of macrofauna(polychaetes,bivalves,gastropods,and crustaceans)were determined to respond to environmental factors differently.While tolerant polychaetes being the minimal impact by environmental factors,bivalves were threated by heavy metal pollutions in sediment.Additionally,body size distribution frequency demonstrated that macrofauna in the low HMC/TPH areas were less disturbed by contamination than those in the HHMC and HTPH areas.The result represented the presentation of sensitive species while tolerant species are usually considered as small size organisms.Overall,this study confirmed the hypothesis that the contamination levels of small-scale patches is indicated by the condition of macrobenthic communities.
文摘This paper considers the asymptotic dynamics of steady states to the Lotka-Volterra competition diffusion systems with random perturbations by two-parameter white noise on the whole real line. By the fundamental solution of heat equation, we get the asymptotic fluctuating behaviors near the stable states respectively. That is, near the steady state (u,v)=(0,1), the mean value Eu(x,t) is shifted above the equilibrium u=0 and Ev(x,t) is shifted below the equilibrium v=1. However, near the steady state (u,v)=(1,0), the mean value Eu(x,t) is shifted below the equilibrium u =1 and Eu(x,t)=0.
基金Team members and participants of the National Nutrition and Health Surveillance 2016–2017 as supported by the National Health Commission of China.
文摘Summary What is already known on this topic?Iron deficiency(ID)is the most widespread micronutrient deficiency and have several adverse effects on health.Consequences of ID among children include delayed psychomotor development and impaired cognitive performance,which makes it important to monitor the iron status of children.
