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Morphology and molecular phylogeny of Pleurosira nanjiensis sp. nov., a new marine benthic diatom from the nanji islands, China

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Acta Oceanologica Sinica 2018年第10期37卷 33-39页

作者： LI Yuhang NAGUMO Tamotsu XU Kuidong Department of Marine Organism Taxonomy and Phylogeny Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266237 China Department of Biology School of Life Dentistry at Tokyo The Nippon Dental University Tokyo 102-8159 Japan University of Chinese Academy of Sciences Beijing 100049 China

A new marine benthic diatom, Pleurosira nanjiensis sp. nov., is described from the rocky intertidal zone of the Xiaochaiyu Island of the nanji islands in China. Its morphology was examined with light and scanning electron microscopy. Molecular phylogeny was reconstructed based on SSU rRNA and rbcL gene sequences. Pleurosira nanjiensis differs from congeners in possession of a combination of morphological features including the domed valve with broadly lanceolate, elliptical or circular valve outline, two elevated marginal ocelli, two （rarely three） rimportulae, and radiate striae.

关键词： Pleurosira nanjiensis rocky intertidal area marine diatom nanji islands new species

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Dinophysis caudata generated lipophilic shellfish toxins in bivalves from the nanji islands, East China Sea

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Chinese Journal of Oceanology and Limnology 2014年第1期32卷 130-139页

作者：江涛徐轶肖李扬齐雨藻江天久吴锋张帆 Research Center for Harmful Algae and Marine Biology Jinan University School of Geographical and Oceanographic Sciences Nanjing University College of Life Science South China Normal University

A 12-month program of monitoring potentially toxic microalgae(that produce lipophilic shellfi sh toxins; LSTs) and their toxins in bivalves was conducted from April 2006 to March 2007 in the nanji islands, East China Sea. Two Dinophysis species, D. caudata and D. acuminata, were identifi ed, and D. caudat a was found to be the dominant species. D. caudata was detected in water samples between April and June 2006, and between February and March 2007. It reached its highest abundances in May, with a mean abundance of 1.38×10 2 cells/L in surface water and 1.25×10 2 cells/L in bottom water(<10 m deep). The temporal distribution of D. caudata was associated with the occurrence of LSTs in bivalve samples, which mostly occurred at the same time as D. caudata blooms, between April and July 2006. All of the cultured bivalves sampled between April and June were contaminated with LSTs, with an average toxicity of 85 μg okadaic acid(OA) eq./100 g meat, which was four times higher than the Chinese regulatory limit(20 μg OA eq./100 g meat). Ten out of fi fteen wild samples(66.7%) collected during the same period were positive for LSTs, and contained an average LST toxicity of 45 μg OA eq./100 g meat(more than twice the regulatory value). Cultured Patinopecten yessoensis collected on 15 May 2006 had the highest toxicity, 320 μg OA eq./100 g meat, and relatively high toxicities(80 to 160 μg OA eq./100 g meat) were found in bivalves until the end of July.

关键词： Dinophysis lipophilic shellfish toxins D. caudate East China Sea nanji islands

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Fish Assemblage and Abundance Distribution in nanji islands Marine Nature Reserve in Relation to Season Change

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Journal of Agricultural Chemistry and Environment 2024年第1期13卷 13-32页

作者： Cheikh Sarr Cungen Yu Ousmane Ndiaye Hamet Diadhiou Ngor Ndour Laboratory of Fishery Resources Zhejiang Ocean University Zhoushan China Laboratory of Agriculture and Environmental Sciences National High School of Agriculture Thies Senegal Senegalese Institute of Agriculture Research Oceanographic Research Center of Dakar Thiaroye Dakar Senegal Laboratory of Agroforestry and Plant Production Assane Seck University of Ziguinchor Ziguinchor Senegal

The fishing survey station located in the warm waters of the East China Sea is one of the abundant fishery resources of waters;with a large number of economic fish breeding grounds and economic juvenile feeding grounds. Several fish species according to this bottom trawl survey results which appear in the annual survey from winter to autumn give us a total of 58 species, which have appeared throughout the year. But the vast majority of species appears only in certain seasons, according to the sea fish survey and based on seasonal migratory species or species mainly small endemic species. The survey of fish is tropical and subtropical warm water species and warm temperate species, and the history of the area has several types of 397 different species. There are many reasons, in addition to recent years, human disturbance and adverse consequences of environmental changes brought about, but also with the relevant sampling methods and sampler time, the survey sampled only trawl based, from Ping yang Ocean and Fisheries Bureau, the waters are still other jobs method net, gill nets, fishing industry, etc. Survey results show that the type of fish in the summer (58 species) > spring (55 species) > winter (51 species) > autumn (42 species). The type of season was among spring to summer rose, summer to autumn decline. The survey found that in the reef area of the nanji islands, no one species of fish is the dominant species throughout the year (according to the dominant species, each species is dominant only in one season). From the dominant species turnover accounting for the four seasons, in winter it has 53.72% of the total biomass or annual biomass, spring it has 41.53% of the overall biomass, summer it has 31.85% and autumn it has 38.56% of total biomass. Visible, seasonal succession of dominant species of fish phenomenon is very obvious, especially in the spring and winter, summer transfers dominate species at this stage show the greatest change, but winter, the transf

关键词： nanji islands Species Composition Abundance Distribution Seasons

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Community Structure of Fish in nanji islands National Nature Reserve and Its Relationship with Environmental Variation

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Journal of Water Resource and Protection 2023年第8期15卷 377-392页

作者： Cheikh Sarr Cungen Yu Ousmane Ndiaye Hamet Diadhiou Ngor Ndour Laboratory of Fishery Resources Zhejiang Ocean University Zhoushan China Laboratory of Agricultural and Environmental Sciences National High School of Agriculture Thies Senegal Senegalese Institute of Agriculture Recherche Oceanographic Research Center of Dakar Thiaroye Dakar Senegal Laboratory of Agroforestry and Plant Production Assane Seck University of Ziguinchor Ziguinchor Senegal

Community structure of fish in relation to environmental variation was investigated in nanji islands National Nature Reserve (NINNR). In order to test this relationship, we delineated 25 survey stations with bottom trawling and measured environmental variables. Samples were taken from November 2013 (autumn), February 2014 (winter), May 2014 (spring) and September 2014 (summer). We found a very strong correlation in space and time between temperature and salinity;abundance and biomass in winter;depth and DO in summer then a strong correlation was found respectively between temperature and biomass;salinity and biomass in winter too and finally a moderate correlation between depth and biomass in spring, (P-value < 0.01) with positive correlation (that the other variable or factor has a tendency to increase). We also found out a negative correlation (P-value < 0.05), respectively between salinity and DO;DO and chlorophyll in summer;temperature and salinity;salinity and DO in spring period (mean that the other variable or factor has a tendency to decrease). A negative correlation observed between temperature, salinity and chlorophyll in winter, spring and autumn period were due by a temperature and salinity window open for species blooms through the movement of the TWC and Jiangzhe coastal current close to shore. By comparing diversity of fish species with environmental factors, the community structure of fish varied significantly as physicochemical parameters changed between different stations for each season. As results and according to the species referencing of environmental factors;species diversity, abundance and evenness vary among different stations, corresponding to significant differences of environmental factors (e.g. physicochemical parameters and chlorophyll-a concentration in different sites). Species richness of microfauna was negatively correlated with salinity levels. Furthermore, they were related to the fish community according to the results. This may

关键词： nanji islands Community Structure Fish Species Environmental Variation

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