为了解五指山野生大叶茶(Camellia sinensis var. assamica)代谢物的特征,利用代谢组学方法,对采集自五指山地区的野生茶树和人工茶园茶叶的代谢物成分开展了比较研究,在野生茶树茶叶中鉴定得到398个含量显著上调的代谢物和247个显著下...为了解五指山野生大叶茶(Camellia sinensis var. assamica)代谢物的特征,利用代谢组学方法,对采集自五指山地区的野生茶树和人工茶园茶叶的代谢物成分开展了比较研究,在野生茶树茶叶中鉴定得到398个含量显著上调的代谢物和247个显著下调的代谢物。基于偏最小二乘法判别分析表明,野生茶叶和人工茶叶分别聚为一类。富集分析结果显示,野生茶树叶片中含量显著上升的代谢物的功能主要富集于糖酵解、丙酮酸合成、氨基糖代谢和核苷糖代谢等糖代谢通路,以及酚类物质合成、核黄素代谢、鞘磷脂代谢和黄酮合成等通路,而显著下降的代谢物的功能主要富集于氨基酸代谢和油脂代谢等初生代谢。展开更多
To investigate the impacts of nutrient concentrations and N：P：Si ratios on the ecosystem of the Huanghai Sea （Yellow Sea）, the current status and long-term variation of nutrients concentrations and ratios as well ...To investigate the impacts of nutrient concentrations and N：P：Si ratios on the ecosystem of the Huanghai Sea （Yellow Sea）, the current status and long-term variation of nutrients concentrations and ratios as well as phytoplankton community structure in the Huanghai Sea were collected and analyzed. The results reveal great annual and seasonal fluctuations in the nutrient concentrations and N：P：Si ratios during 1998-2008 with no clear pattern observed in the whole region. Yet on a seasonal scale of spring and in the coastal regions such as the Jiaozhou Bay and Sanggou Bay, the increase of DIN concentration and N：P ratio as well as the decrease of phosphate and sili- cate concentrations and Si：N ratios were relatively significant. Many pelagic ecosystem changes have occurred concurrent with these changes of the nutrient regime, such as the recent increase of primary production, changes of phytoplankton chlorophyll a biomass and abundance, an increase of eutrophication, and occurrence of HABs. In addition, new trends in the variation of nutrients seem to be developing in some particular transect such as 36N, which suggests that long-term and systematic ecosystem monitoring in the Huanghai Sea is necessary.展开更多
Since 2007,large-scale green tides dominated by Ulva prolifera consecutively bloomed in the Yellow Sea and caused great economic losses.The fouling U.prolifera on the Pyropia yezoensis aquaculture rafts in the Subei S...Since 2007,large-scale green tides dominated by Ulva prolifera consecutively bloomed in the Yellow Sea and caused great economic losses.The fouling U.prolifera on the Pyropia yezoensis aquaculture rafts in the Subei Shoal was regarded as the major source of the floating biomass.However,it was still unclear about the seed source of fouling green macroalgae attached on the rafts.In this study,the field surveys and the indoor experiments were conducted to reveal the source of propagules of the fouling green macroalgae on the rafts and to study the anti-fouling material for P.yezoensis aquaculture rafts which could possibly be a feasible strategy to control the green tides in the Yellow Sea.The results showed that（1） micro-propagules of several green macroalgal species,including U.prolifera,U.linza,U.compressa,U.flexuosa,and Blidingia sp.coexisted in the waters and sediments in the Subei Shoal and their proportion remarkably changed over time;（2） the bamboo poles with peeling treatment could significantly reduce the amount of U.prolifera micro-propagules attached.This study confirmed that the micro-propagules distributed in the Subei Shoal area were the precursors of the green tides,and provided a feasible method to control the Yellow Sea large-scale green tides at the beginning.展开更多
Upwelling occurs on the coast of Java between June and October, forced by local alongshore winds associated with the southeasterly monsoon. This causes variations in phytoplankton community composition in the upwellin...Upwelling occurs on the coast of Java between June and October, forced by local alongshore winds associated with the southeasterly monsoon. This causes variations in phytoplankton community composition in the upwelling zone compared with the surrounding offshore area. Based on pigments analysis with subsequent calculations of group contributions to total chlorophyll a(Chl a) using CHEMTAX, we studied the distribution and composition of phytoplankton assemblages in the subsurface chlorophyll maximum along the south coast of Java and the influence of upwelling. Nineteen phytoplankton pigments were identified using high-performance liquid chromatography, and CHEMTAX analysis associated these to ten major phytoplankton groups. The phytoplankton community in the coastal area influenced by upwelling was characterized by high Chl a and fucoxanthin concentrations, indicating the dominance of diatoms. In contrast, in the offshore area, the Chl a and fucoxanthin concentrations declined to very low levels and the community was dominated by haptophytes represented by 19′-Hexanoyloxyfucoxanthin. Accordingly, microphytoplankton was found to be the major size class in the coastal area influenced by upwelling, while nanophytoplankton was most abundant in the offshore area. Low concentrations of other accessory pigments indicated less contribution from dinoflagellates,prasinophytes, chlorophytes and cryptophytes. Photo-pigment indices revealed that photosynthetic carotenoids(PSCs) were the largest component of the pigment pool, exceeding the proportion of Chl a, with the average PSCTP up to 0.62. These distribution trends can mainly be explained by phytoplankton adaption strategies to upwelling and subsurface conditions by changing species composition and adjusting the pigment pool.展开更多
文摘为了解五指山野生大叶茶(Camellia sinensis var. assamica)代谢物的特征,利用代谢组学方法,对采集自五指山地区的野生茶树和人工茶园茶叶的代谢物成分开展了比较研究,在野生茶树茶叶中鉴定得到398个含量显著上调的代谢物和247个显著下调的代谢物。基于偏最小二乘法判别分析表明,野生茶叶和人工茶叶分别聚为一类。富集分析结果显示,野生茶树叶片中含量显著上升的代谢物的功能主要富集于糖酵解、丙酮酸合成、氨基糖代谢和核苷糖代谢等糖代谢通路,以及酚类物质合成、核黄素代谢、鞘磷脂代谢和黄酮合成等通路,而显著下降的代谢物的功能主要富集于氨基酸代谢和油脂代谢等初生代谢。
基金The China-Korea Cooperative Research on the Yellow Sea Cold Water Massthe National Key Basic Research Project of China under contract No. 2010CB428703
文摘To investigate the impacts of nutrient concentrations and N：P：Si ratios on the ecosystem of the Huanghai Sea （Yellow Sea）, the current status and long-term variation of nutrients concentrations and ratios as well as phytoplankton community structure in the Huanghai Sea were collected and analyzed. The results reveal great annual and seasonal fluctuations in the nutrient concentrations and N：P：Si ratios during 1998-2008 with no clear pattern observed in the whole region. Yet on a seasonal scale of spring and in the coastal regions such as the Jiaozhou Bay and Sanggou Bay, the increase of DIN concentration and N：P ratio as well as the decrease of phosphate and sili- cate concentrations and Si：N ratios were relatively significant. Many pelagic ecosystem changes have occurred concurrent with these changes of the nutrient regime, such as the recent increase of primary production, changes of phytoplankton chlorophyll a biomass and abundance, an increase of eutrophication, and occurrence of HABs. In addition, new trends in the variation of nutrients seem to be developing in some particular transect such as 36N, which suggests that long-term and systematic ecosystem monitoring in the Huanghai Sea is necessary.
基金The National Natural Science Foundation of China under contract Nos 41606190 and 41506185the Fundamental Research Funds for FIO under contract No.2015G09+1 种基金the Foundation of Key Laboratory of Integrated Monitoring and Applied Technologies for Marine Harmful Algal Blooms,SOA under contract Nos MATHAB201507 and MATHAB201806Shandong Natural Science Foundation under contract No.ZR2016DB22
文摘Since 2007,large-scale green tides dominated by Ulva prolifera consecutively bloomed in the Yellow Sea and caused great economic losses.The fouling U.prolifera on the Pyropia yezoensis aquaculture rafts in the Subei Shoal was regarded as the major source of the floating biomass.However,it was still unclear about the seed source of fouling green macroalgae attached on the rafts.In this study,the field surveys and the indoor experiments were conducted to reveal the source of propagules of the fouling green macroalgae on the rafts and to study the anti-fouling material for P.yezoensis aquaculture rafts which could possibly be a feasible strategy to control the green tides in the Yellow Sea.The results showed that（1） micro-propagules of several green macroalgal species,including U.prolifera,U.linza,U.compressa,U.flexuosa,and Blidingia sp.coexisted in the waters and sediments in the Subei Shoal and their proportion remarkably changed over time;（2） the bamboo poles with peeling treatment could significantly reduce the amount of U.prolifera micro-propagules attached.This study confirmed that the micro-propagules distributed in the Subei Shoal area were the precursors of the green tides,and provided a feasible method to control the Yellow Sea large-scale green tides at the beginning.
基金The Global Change and Air-Sea Interaction Program under contract Nos GASI-02-IND-ST-Sspr and GASI-03-01-03-03the National Natural Science Foundation of China under contract No.41506185the Special Funds for Basic Ocean Science Research of the First Institute of Oceanography,State Oceanic Administration of China under contract Nos 2013T04 and 2012T08
文摘Upwelling occurs on the coast of Java between June and October, forced by local alongshore winds associated with the southeasterly monsoon. This causes variations in phytoplankton community composition in the upwelling zone compared with the surrounding offshore area. Based on pigments analysis with subsequent calculations of group contributions to total chlorophyll a(Chl a) using CHEMTAX, we studied the distribution and composition of phytoplankton assemblages in the subsurface chlorophyll maximum along the south coast of Java and the influence of upwelling. Nineteen phytoplankton pigments were identified using high-performance liquid chromatography, and CHEMTAX analysis associated these to ten major phytoplankton groups. The phytoplankton community in the coastal area influenced by upwelling was characterized by high Chl a and fucoxanthin concentrations, indicating the dominance of diatoms. In contrast, in the offshore area, the Chl a and fucoxanthin concentrations declined to very low levels and the community was dominated by haptophytes represented by 19′-Hexanoyloxyfucoxanthin. Accordingly, microphytoplankton was found to be the major size class in the coastal area influenced by upwelling, while nanophytoplankton was most abundant in the offshore area. Low concentrations of other accessory pigments indicated less contribution from dinoflagellates,prasinophytes, chlorophytes and cryptophytes. Photo-pigment indices revealed that photosynthetic carotenoids(PSCs) were the largest component of the pigment pool, exceeding the proportion of Chl a, with the average PSCTP up to 0.62. These distribution trends can mainly be explained by phytoplankton adaption strategies to upwelling and subsurface conditions by changing species composition and adjusting the pigment pool.
