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| 1 | Phytoplankton composition and its ecological effect in subsurface cold pool of the northern Bering Sea in summer as revealed by HPLC derived pigment signatures显示文摘CHEMTAX analysis of high-performance liquid chromatography(HPLC) pigment was conducted to study phytoplankton community structure in the northern Bering Sea shelf, where a seasonal subsurface cold pool emerges. The results showed that fucoxanthin(Fuco) and chlorophyll a(Chl a) were the most abundant diagnostic pigments, with the integrated water column values ranging from 141 to 2 160 μg/m2 and 477 to 5 535 μg/m2, respectively. Moreover, a diatom bloom was identified at Sta. BB06 with the standing stock of Fuco up to 9 214 μg/m3. The results of CHEMTAX suggested that the phytoplankton community in the northern Bering Sea shelf was dominated by diatoms and chrysophytes with an average relative contribution to Chl a of 80% and 12%, respectively, followed by chlorophytes, dinoflagellates, and cryptophytes. Diatoms were the absolutely dominant algae in the subsurface cold pool with a relative contribution exceeding 90%, while the contribution of chrysophytes was generally higher in oligotrophic upper water. Additionally, the presence of a cold pool would tend to favor accumulation of diatom biomass and a bloom that occurred beneath the halocline would be beneficial to organic matter sinks, which suggests that a large part of the phytoplankton biomass would settle to the seabed and support a rich benthic biomass. | ZHUANG Yanpei JIN Haiyan LI Hongliang CHEN Jianfang WANG Bin CHEN Fajin BAI Youcheng LU Yong TIAN Shichao | 2014 | Acta Oceanologica Sinica2014，33，6： | 7 |
| 2 | Composition of algal pigments in surface freshen layer after ice melt in the central Arctic显示文摘Seasonal meltwater input creates a thin freshen layer in surface seawater under ice,which largely shifts the algae assemblages.Our recent observation of photosynthetic pigments in the high Arctic showed that ice bottom and 5m of seawater under ice contained relatively high concentration of fucoxanthin,while chlorophyll b and lutein were the major diagnostic pigments in ice-water interface and 0 m of seawater under ice.Additionally,a notable change of dominant phytoplankton occurred in the top 5 m of seawater under ice,from chlorophytes-dominated at surface to diatoms-dominated at 5 m depth,which might attribute to the sharp salinity gradient(salinity from12.5 to 28.1) in the surface seawater under ice.Our results imply that phytoplankton community in surface layer under ice would become more chlorophytes in the future warming Arctic Ocean. | ZHUANG Yanpei JIN Haiyan GU Fan ZHANG Yang BAI Youcheng JI Zhongqiang LU Yong CHEN lianfang | 2017 | Acta Oceanologica Sinica2017，36，8： | 6 |
| 3 | Vertical distribution of nutrient tracers in the western Arctic Ocean and its relationship to water structure and biogeochemical processes显示文摘During the 3rd Chinese National Arctic Research Expedition cruise in the summer of 2008,nutrients(NO3^-,NO2^-,SiO3^2-,and PO4^3-)and dissolved oxygen were measured in the western Arctic Ocean,to derive the vertical distribution of nutrient tracers and its relationship to water structure and biogeochemical processes.The nutrient data show that surface waters had the lowest NO3^-/PO4^3-(mean of 0.5)and SiO3^2-/PO3^-(mean of 2.8)values in the water column,suggesting an excess of phosphate.Winter Bering Shelf water(wBSW)had high Si^*(16.7μmol/L;Si^*=[Si(OH)4]–[NO3^-])with negative N^*(−11.7μmol/L;N^*=[PO4^3-]−16[PO4^3-]+3.5μmol/L)in the water column,indicating nitrate deficiency.The warm Atlantic layer had positive N^*(0.8μmol/L)and negative Si^*(−5.4μmol/L)compared with Pacific source water.The vertical distribution of nutrients indicates that wBSW can be characterized by N^* minimum and Si^* maximum.In contrast,minima of Si^* and SiO3^2-/PO4^3- below 200 m indicate the distribution of Atlantic warm water. | Yanpei Zhuang Hongliang Li Haiyan Jin Shengquan Gao Jianfang Chen Yangjie Li Youcheng Bai Zhongqiang Ji | 2020 | Acta Oceanologica Sinica2020，39，9： | 1 |
| 4 | Status Quo and Application of North American Wisteria in Shijiazhuang显示文摘The introduction and planting of three cultivars of North American wisteria in Shijiazhuang were observed.By comparing the inflorescences of Chinese wisteria,Japanese wisteria and North American wisteria,it is concluded that North American wisteria has compact inflorescence,rich color and late flowering period,and can prolong the ornamental time of wisteria when collocating with Chinese wisteria and Japanese wisteria in landscape application.The application of North American wisteria in Chinese gardens can not only enrich the species diversity of the region,but also have positive significance for improving the landscape effect of the whole city. | WANG Yin LI Yanpei BAI Suhui JIAO Lili | 2023 | Journal of Landscape Research2023，15，2： | 0 |
| 5 | Comparison of Phytoplankton Communities Between Melt Ponds and Open Water in the Central Arctic Ocean显示文摘Climate warming has a significant impact on the sea ice and ecosystem of the Arctic Ocean.Under the increasing numbers of melt ponds in Arctic sea ice,the phytoplankton communities associated with the ice system are changing.During the 7th Chinese National Arctic Research Expedition cruise in summer 2016,photosynthesis pigments and nutrients were analyzed,revealing differences in phytoplankton communities between melt ponds and open water in the central Arctic.Photosynthetic pigment analysis suggested that Fuco(5-91μg m^-3)and Diadino(4-21μg m^-3)were the main pigments in the open water.However,the melt ponds had high concentrations of Viola(7-30μg m^-3),Lut(4-59μg m^-3)and Chl b(11-38μg m^-3),suggesting that green algae dominated phytoplankton communities in the melt ponds.The significant differences in phytoplankton communities between melt ponds and open water might be due to the salinity difference.Moreover,green algae may play a more important role in Arctic sea ice ecosystems with the expected growing number of melt ponds in the central Arctic Ocean. | ZHANG Tianzhen ZHUANG Yanpei JIN Haiyan LI Ke JI Zhongqiang LI Yangjie BAI Youcheng | 2019 | Journal of Ocean University of China2019，18，3： | 0 |
| 6 | Endozoochorous seed dispersal by golden snub-nosed monkeys in a temperate forest显示文摘Seed dispersal is essential for plant recruitment and the maintenance of biodiversity.Colobine monkeys are primarily folivorous,but they also consume fruits and are often assumed to be seed predators.Although they are known to be epizoochorous seed dispersers,their role as endozoochorous seed dispersers needs reassessment.We examined potential endozoochory in golden snub-nosed monkeys(Rhinopithecus roxellana)at Dalongtan in Shennongjia National Park,central China,by assessing potential germination of ingested seeds(n=1806,9 species)from fecal samples.Intact seeds were in almost all fecal samples(ranging from 5-130 seeds),and ingested seeds were from small seeded species(seed width<4.5 mm).The 2 most abundant species were Actinidia arguta(73%)and Rosa caudata(15%).The fruits of A.arguta were unripe when ingested(i.e.effective seed predation)and the ingested seeds did not germinate in the trials.Therefore,ingestion of unripe seeds does not lead to effective seed dispersal.However,germination rates of defecated R.caudata(9%)were greater than control seeds(6%and 0%),demon-strating potential endozoochorous seed dispersal.Thus,colobine monkeys do indeed disperse mainly small-seeded from multi-seeded fruits through potential endozoochory and this process enhances the recruitment of seedlings. | Hui YAO Yanpei BAI Yuan CHEN Haochun CHEN Wanji YANG Xiangdong RUAN Zuofu XIANG | 2021 | Integrative Zoology2021，16，1： | 0 |
| 7 | Overlooked contribution of the biological pump to the Pacific Arctic nitrogen deficit显示文摘The nutrient-rich Pacific Ocean seawater that flows through the Bering Strait into the Chukchi Sea is generally considered to be the most important source of nutrients to the Arctic euphotic zone.The inflow is characterized by nitrogen deficit and low nitrate/phosphate(N/P)ratios;this is ascribed to sedimentary denitrification on the Chukchi shelf by preoccupant opinions.However,the Chukchi Sea also has high primary production,which raises the question of whether the biological pump may also significantly modulate nutrient properties of the throughflow.Here,we show that nitrate concentrations of the Pacific inflow gradually decrease northward in association with notable biological utilization.The phytoplankton N/P uptake ratio was 8.8±2.27,higher than the N/P ratio of Pacific inflow water(5-6).This uptake ratio,in combination with efficient vertical nitrogen export,serves to preferentially remove nitrogen(relative to phosphorus)from upper waters,thereby further intensifying the Arctic nitrogen deficit.Accordingly,as large as about 111.7×10^(9)mol N yr^(−1)of nitrate was extra consumed,according to the real N/P uptake ratio rather than the ratio of the Pacific inflow,which may be as great as half the nitrogen loss ascribed to sedimentary denitrification.Our findings suggest that besides sedimentary denitrification,biological disproportionate utilization of nutrients in the Chukchi Sea upper water is another important contributor to the nitrogen limitation and excess phosphorus in the upper Arctic Ocean.In the rapid Arctic change era,the predicted reinforced biological carbon pump could further impact the nutrient dynamics and biogeochemical process of the Arctic Ocean. | Hongliang LI Jianfang CHEN Diana RUIZ-PINO Jingjing ZHANG Haiyan JIN Yanpei ZHUANG Youcheng BAI Jian REN Yangjie LI | 2022 | Science China Earth Sciences2022，65，8： | 0 |
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