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Annual variation in Calanus sinicus abundance and population structure in the northern boundary area of the Yellow Sea Cold Water Mass

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Chinese Journal of Oceanology and Limnology 2013年第6期31卷 1284-1294页

作者：尹洁慧张光涛赵增霞王世伟万艾勇 Jiaozhou Bay marine Ecosystem Research station Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences

The Yellow Sea Cold Water Mass （YSCWM） was suggested as an over-summering site of the dominant copepod species Calanus sinicus in coastal Chinese seas. Population abundance and structure were investigated by monthly sampling along three transects across the northern boundary of the YSCWM during 2009-2010. Results show that thermal stratification existed from June to October and that the vertical thermal difference increased with depth. Generally, total abundance was lowest in October and highest in June, and the female/male sex ratio was highest in February and lowest in August. Evident spatial differences in abundance were observed during the existence of the YSCWM. In June, total abundance averaged 158.8 ind/m~ at well-stratified stations, and 532.1 ind/m3 at other stations. Similarly, high abundances of 322.0 and 324.4 ind/m3 were recorded from July to August inside the YSCWM, while the abundance decreased from 50.4 to 1.9 ind/m3 outside the water mass. C. sinicus distribution tended to even out over the study area in September when the YSCWM disappeared. We believe that the YSCWM may retard population recruitment in spring and preserve abundant cohorts in summer. The summer population was transported to neritic waters in autumn. In addition to low temperatures, stable vertical structure was also an essential condition for preservation of the summer population. C. sinicus can survive the summer in marginal areas in high abundance, but the population structure is completely different in terms of C5 proportion and sex ratio.

关键词： Calanus sinicus Yellow Sea Cold Water Mass (YSCWM) over-summer strategy boundary area thermal stratification

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The impact of biotic and abiotic factors on the distribution of surface sediment dinoflagellate cyst assemblages on the Nanji Island in the East China Sea

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Acta Oceanologica Sinica 2019年第1期38卷 160-171页

作者： Han Gao Shengpao You Xiangdong Lei Yunpu Xiao Haifeng Gu Mengmeng Tong Ocean College Zhejiang University Nanji marine Environment Monitoring station Ministry of Natural Resources Pingyang County marine and Fisheries Bureau Third Institute of Oceanography Ministry of Natural Resources

The dinoflagellate cyst assemblages on the Nanji Island in the East China Sea, are documented at the first time to construct a quantitative overview of the cyst bank from 2014 to 2015. Thirty-four morphotypes from six groups are identified and quantified at eight sampling sites around the island, including a high proportion of potentially toxigenic species(14%). Autotrophic dinocysts constitute 74% of the total cyst counts, which is relatively low(two to thirty-three per millilitre sediment) compared with previous studies in adjacent areas. Scrippsiella trochoidea and Protoperidinium avellana are the most abundant autotrophic and heterotrophic species, respectively. A multivariate analysis is performed to assess associations between dinocysts and abiotic or biotic *** among seasons is evident in the detrended correspondence analysis(DCA) ordination plot, while a spatial pattern is not clearly revealed despite heterogeneity of the hydrodynamic conditions between sampling sites. Soluble reactive phosphate, the ratio of nitrogen to phosphorus concentrations and Karenia mikimotoi bloom are the three factors significantly(P<0.05) related to surface sediment cyst assemblage defined by the canonical correspondence analysis(CCA), highlighting the importance of nutrient regime to a dinocyst distribution in this area. Although attempts to address the origin of HAB events in recent years using seed banks have failed, knowledge can be valuable for further investigation of dinocyst dynamics and potential toxin threats on the Nanji Island.

关键词： dinoflagellate cyst Nanji Island nutrients harmful algal blooms

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Restriction Fragment Length Polymorphism Analysis of Large Subunit rDNA of Symbiotic Dinoflagellates from Scleractinian Corals in the Zhubi Coral Reef of the Nansha Islands

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植物学报（英文版） 2006年第2期48卷 148-152页

作者： Hui Huang Zhi-Jun Dong Liang-Min Huang Jun-Bin Zhang Key Laboratory of Tropical marine Environmental Dynamics South China Sea Institute of Oceanlogy the Chinese Academy of Sciences Guangzhou 510301 China National Experimental station of Tropical marine biology Sanya Hainan Island China Key Laboratory of Tropical marine Environmental Dynamics South China Sea Institute of Oceanlogy the Chinese Academy of Sciences Guangzhou 510301 China

Zooxanthellae are very important for the coral reef ecosystem. The diversity of coral hosts is high in the South China Sea, but the diversity of zooxanthellae has not yet been investigated. We chose the Zhubi Coral Reef of the Nansha Islands as the region to be surveyed in the present study because it represents a typical tropical coral reef of the South China Sea and we investigated zooxanthellae diversity in 10 host scleractinian coral species using polymerase chain reaction (PCR) of the large subunit rRNA and restriction fragment length polymorphism (RFLP) patterns. Pocillopora verrucosa, Acropora pelifera, Acropora millepora, Fungia fungites, Galaxea fascicularis, and Acropora pruinosa harbor Clade C, Goniastrea aspera harbors Clade D, and Acropora formosa harbors Clades D and C. Therefore, the Clade C is the dominant type in the Zhubi Coral Reef of the NanshaIslands. Furthermore, the results of the present also disprove what has been widely accepted, namely that one coral host harbors only one algal symbiont. The coral-algal symbiosis is flexible, which may be an important mechanism for surviving coral bleaching. Meanwhile, on the basis of the results of the present study, we think that Symbiodinium Clade D may be more tolerant to stress than Symbiodinium Clade C.

关键词： large subunit rDNA restriction fragment length polymorphism scleractinian corals symbiotic dinoflagellates Zhubi Coral Reef zooxanthellae

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Ecological impacts of the expansion of offshore wind farms on trophic level species of marine food chain

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Journal of Environmental Sciences 2024年第5期139卷 226-244页

作者： Lijing Wang Bangguo Wang Wenxi Cen Rui Xu Yuwei Huang Xin Zhang Yinghui Han Yuanxun Zhang College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China Yanshan Earth Critical Zone and Surface Fluxes Research station University of Chinese Academy of SciencesBeijing 101408China Chinese Research Academy of Environmental Sciences Beijing 100012China National Joint Research Center for Yangtze River Conservation Beijing 100012China College of Environmental Engineering Beijing University of TechnologyBeijing 100124China Institute of Eco-Environmental Forensics Shandong UniversityQingdao 266237China

The global demand for renewable energy has resulted in a rapid expansion of offshore wind farms(OWFs)and increased attention to the ecological impacts of OWFs on the marine *** reviews mainly focused on the OWFs’impacts on individual species like birds,bats,or *** review collected numerous field-measured data and simulated results to summarize the ecological impacts on phytoplankton,zooplankton,zoobenthos,fishes,and mammals from each trophic level and also analyze their interactions in the marine food *** and zooplankton are positively or adversely affected by the‘wave effect’,‘shading effect’,oxygen depletion and predation pressure,leading to a ±10% fluctuation of primary *** zoobenthos are threatened transiently by habitat destruction with a reduction of around 60% in biomass in the construction stage,their abundance exhibited an over 90% increase,dominated by sessile species,due to the‘reef effect’in the operation *** fishes and mammals are to endure the interferences of noise and electromagnetic,but they are also aggregated around OWFs by the‘reef effect’and‘reserve effect’.Furthermore,the complexity of marine ecosystem would increase with a promotion of the total system biomass by 40% through trophic cascade effects strengthen and resource partitioning alternation triggered by the proliferation of *** suitable site selection,long-term monitoring,and life-cycle-assessment of ecological impacts of OWFs that are lacking in current literature have been described in this review,as well as the carbon emission and deposition.

关键词： Offshore wind farms(OWFs) Ecological impacts Plankton Benthos Fish Mammal

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Dietary separation between co-occurring copepods in a food-limited tropical coral reef of the Sanya Bay

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Acta Oceanologica Sinica 2020年第4期39卷 65-72页

作者： Simin Hu Tao Li Sheng Liu Hui Huang Key Laboratory of Tropical marine Bio-Resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Guangdong Provincial Key Laboratory of Applied marine biology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Tropical marine Biological Research station in Hainan Chinese Academy of SciencesSanya 572000China

Food differentiation among coexistent species in the field is important strategy for copepods to acquire materials and maintain population *** situ diet analysis of co-occurring six copepod species in coral waters of the Sanya Bay was conducted using a PCR protocol based on 18 S ribosomal *** prey organisms were uncovered,including dinoflagellate,diatom,green algae and plant,protozoa and *** these spatially coexisting six species showed different dietary diversity,with the food niche breadth(B)ranging from 1.00(Temora turbinate in morning)to 10.68(Calanopia elliptica in night).While food overlap between all these copepods were low,with the average value of the diet niche overlap index being approximately *** temporally co-existing species sampled from the same time point fed on different groups of prey items with the food overlap index of 0.04 to 0.07 in midday and night but 0 in *** the most important dominant copepod in the Sanya Bay,Subeucalanus subcrassus seems to be capable to regulate its feeding,by exhibiting a rhythm of herbivorous feeding in midday and carnivorous feeding in morning and night,to better coordinate with other competitors for utilization of food *** most copepods,none of the prey items belonged to the dominant phytoplankton in the ambient water,indicating that copepod can better their survival by widening the choice of potential food resources in food limited *** dietary separation observed here might be important strategy for copepod to maintain population stabilization and thriving in the Sanya coastal waters.

关键词： copepod food partitioning Sanya Bay coral reef ecosystem

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Studies on the seasonal variations in the proximate composition of ascidians from the Palk Bay,Southeast coast of India

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Asian Pacific Journal of Tropical Biomedicine 2012年第10期2卷 793-797页

作者： Ananthan G Karthikeyan MM Selva Prabhu A Raghunathan C Centre of Advanced Study in marine biology Faculty of Marine SciencesAnnamalai University Zoological Survey of India Andaman and NicobarRegional Station.1Horticulture RoadHaddoPort Blair744102

Objective:To investigate the seasonal fluctuations of the proximate composition of the ascidians ***:The moisture content was estimated by drying 1 g of fresh tissue at a constant temperature at 105(?)for 24 *** loss of weight was taken as moisture *** total protein was estimated using the Biuret *** total carbohydrate in dried sample was estimated spectrophotometrically following the phenol-sulphuric acid *** lipid in the dried sample tissue was gravimetrically estimated following the chloroform-methanol mixture *** content was determined gravimetrically by incinerating 1 g dried sample in muffle furnace at about 550℃for 6 h and results are expressed in ***:It was found very difficult to compare the monthly variations,as all the ten species,exhibited wide fluctuations in their proximate *** the sake of convenience,average seasonal values were calculated by summing the monthly ***:The proximate composition of the 10 commonly available ascidians showed high nutritive value and hence these groups especially solitary ascidians can be recommended for human consumption in terms of pickles,soup,curry and others after ensuring the safety of consumers.

关键词： Ascidians Biochemical composition Seasonal variations proximate composition

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Molecular quantification of copepod Acartia erythraea feeding on different algae preys

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Acta Oceanologica Sinica 2023年第9期42卷 125-131页

作者： Simin Hu Tao Li Hui Huang Sheng Liu Key Laboratory of Tropical marine Bio-resources and Ecology Chinese Academy of SciencesGuangzhou 510301China Guangdong Provincial Key Laboratory of Applied marine biology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China CAS-HKUST Sanya Joint Laboratory of marine Science Research/Key Laboratory of Tropical marine Biotechnology of Hainan Province Sanya Institute of Ocean Eco-Environmental EngineeringSouth China Sea Institute of OceanologySanya 572000China Sanya National marine Ecosystem Research station Tropical Marine Biological Research Station in HainanChinese Academy of SciencesSanya 572000China

Quantitative evaluation of the copepod feeding process is critical for understanding the functioning of marine food webs, as this provides a major link between primary producers and higher trophic levels. In this study, a molecular protocol based on quantitative polymerase chain reaction(qPCR) targeting 18S rDNA was developed and used to investigate the feeding and digestion rates of the copepod Acartia erythraea in a laboratory experiment using microalgae Thalassiosira weissflogii, Prorocentrum shikokuense, and Alexandrium catenella as prey. Although offered an equal encounter rate based on biovolume, prey uptake varied substantially among the three algal species, with the ingestion rate(IR) and digestion rate(DR) of A. erythraea differing significantly(P marine ecosystem. Our results indicate that A. erythraea has diet-specific feeding performance in different processes, and a quantitative assessment of copepod feeding is needed to accurately determine its functional role in the energy and matter uptake from marine food webs.

关键词： copepod ingestion rate digestion rate 18S rDNA real-time PCR

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Dynamics of nonstructural carbohydrates in seagrass Thalassia hemprichii and its response to shading

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Acta Oceanologica Sinica 2013年第8期32卷 61-67页

作者： JIANG Zhijian HUANG Xiaoping ZHANG Jingping Key Laboratory of Tropical marine Bio-resources and Ecology South China Sea Institute of Oceanology Chinese Academy of Sciences Tropical marine Biological Research station in Hainan Chinese Academy of Sciences

A field survey was performed to examine nonstructural carbohydrate （NSC） dynamics in seagrass Thalassia hemprichii at the Xincun Bay in southern China. An indoor experiment to investigate the response of NSC in T. hemprichiito shade was conducted. Belowground tissue of T. hemprichiiwas the dominant site of NSC reserves, and soluble sugar was the primary storage compound. The starch content of belowground tissue was lower in high intertidal areas than in low intertidal areas, indicating that the longer air exposure in high intertidal areas resulted in less NSC synthesis and less accumulation of NSC in T. hemprichii. The lowest level of soluble sugar and its proportion to NSC in belowground tissue were observed near the cage culture area, where the nutrient concentration in water and sediment was the highest; while the highest level of that was observed near the coastal shrimp farm, where salinity was the lowest. Soluble sugar in belowground tis- sue showed the following trend： summer〉spring〉winter〉autumn. This corresponded to seasonal changes in the intensity of light. Leaf sugar accumulated during the autumn-winter period, providing a carbon and energy source for flower bud formation and seed germination. Short-term shading decreased NSC accumu- lation. Collectively, these results suggest that nutrient enrichment, freshwater discharge and exposure to air affect NSC dynamics in T. hemprichii. Light intensity, flower bud formation, and seed germination were all found to induce seasonal variations in NSC in T. hemprichii.

关键词： Thalassia hemprichii nonstructural carbohydrates Xincun Bay dynamics shade

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Lipids and fatty acids in Calanus sinicus during over-summering in the southern Yellow Sea

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Chinese Journal of Oceanology and Limnology 2017年第4期35卷 874-882页

作者：王延清李超伦刘梦坛金鑫 Key Laboratory of marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences Laboratory for marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Jiaozhou Bay marine Ecosystem Research station Chinese Ecosystem Research Network

Over-summering is a crucial period for Calanus sinicus in the southern Yellow Sea,where it is a key member of the zooplankton *** play an important role in copepod diapause,which is part of their over-summering *** investigated how different fatty acids and lipid classes,including wax esters,changed during over-summering of *** during three cruises in June and August 2011 and November 2010,corresponding to the pre-,during and post-diapause periods,*** amounts of lipids were accumulated,mainly wax esters as previously found in *** during its diapause,and most of the storage lipids were used during *** ester polyunsaturated fatty acids(PUFAs) showed the most variation of the fatty acids(FAs),while the percentage composition of FAs in polar lipids was relatively *** use of wax ester PUFAs has already been shown to play important roles in the winter diapause of Calanus species in other regions,and our FA results show that this is the case for the Yellow Sea Cold Bottom Water(YSCBW) population that diapauses in summer.

关键词： Calanus sinicus lipid wax ester polar lipid polyunsaturated fatty acids (PUFAs)

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Biomass and carbon storage of Gracilariopsis lemaneiformis(Rhodophyta) in Zhanshan Bay, Qingdao, China

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Chinese Journal of Oceanology and Limnology 2014年第5期32卷 1009-1015页

作者：周伟隋正红王津果胡依依康庆浩吴俊映金相澈黄建辉王朋云 Key Laboratory of marine Genetics and Breeding Ministry of Education College of Marine Life Sciences Ocean University of China Department of Aquaculture Chonnam National University Aquaculture Technology Extension station of Putian

marine macroalgae can absorb carbon and play an important role in carbon sequestration. As an important economic macroalga, Gracilariopsis lemaneiformis has the potential to significantly affect carbon absorption and storage in wave-sheltered intertidal reef systems. However, detailed knowledge on seasonal biomass changes and carbon storage of G. lemaneiformis is lacking, especially in many small and scattered ecosystems. Considering the influence of human activities on wild distribution of G. lemaneiformis, the understanding of seasonal dynamics of an economically important species in nature is necessary. In this study, we first investigated seasonal variations in biomass, coverage area, and carbon storage during low tide from August 2011 to July 2012 in Zhanshan Bay, Qingdao, China. Furthermore, we estimated the carbon storage potential of wild G. lemaneiformis using light use efficiency （LUE）. The results show that the standing biomass and coverage area changed significantly with season. However, seasonal variations in carbon content and water content were not obvious, with an average content of 35.1% and 83.64%, respectively. Moreover, carbon storage in individual months varied between 0.67 and 47.03 g C/mE, and the value of carbon storage was the highest in August and June and the lowest in February. In Zhanshan Bay, LUE of G. lemaneiformis was only 0.23%. If it is increased to the theoretical maximum （5%-6%）, the carbon storage will have an increase of at least 21 times compared with the current, which suggested that carbon storage of wild G. lemaneiformis had a high enhancement potential. The study will help to assess a potential role of G. lemaneiformis in reducing atmospheric CO2

关键词： carbon storage Gracilaria Gracilariopsis lemaneiformis standing biomass Qingdao

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