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Colonization dynamics of periphytic diatoms in coastal waters of the Yellow Sea, northern China

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Acta Oceanologica Sinica 2014年第9期33卷 160-165页

作者： Liu Yuanyuan Zhang Wei xu henglong institute of Evolution and Marine Biodiversity Ocean university of China

The colonization features of periphytic diatoms were studied in coastal waters of the Yellow Sea, northern China from May to June 2010, using glass slides as an artificial substratum. Samples were collected at a time interval of 1, 3, 7, 10, 14, 21 and 28 d from two depths of 1 and 3 m. The dynamics of diatom colonization process had a similar pattern in community structure and fitted the logistic model in growth curve at both depths. The maximum abundance and the time for reaching 50% maximum abundance （10 d） showed no significant differences （P〉0.05） between two depths 1 and 3 m. Although the diatom communities repre- sented similar taxonomic composition, they differed in the temporal pattern of structural parameters and in succession dynamics of dominant species between the two layers. The species richness showed significantly higher values during the colonization period more than 14 d, while the species diversity and evenness rep- resented a higher variability with significantly different values （P〈0.05） at a depth of 1 m than at a deeper layer. The results suggest that the diatom colonization follows the logistic model growth curve and differs in colonization features between different depths in the coastal waters, and that the sampling strategy at i m is more effective to detect the ecological features for bioassessment in marine ecosystems.

关键词： bioassessment biofilm coastal waters colonization dynamics periphytic diatom

A Bioassay for the Cytotoxicity of Gemcitabine Using the Marine Ciliate Euplotes vannus

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Journal of Ocean University of China 2019年第3期18卷 675-679页

作者： WANG Qi xu henglong WARREN Alan Department of Urology Surgery Qingdao Municipal Hospital Group Qingdao 266000 China College of Marine Life Science Ocean University of China Qingdao 266003 China Department of Life Sciences Natural History Museum London SW7 5BD UK

This study investigated the cytotoxicity of gemcitabine using the marine ciliate Euplotes vannus as the test *** median lethal concentrations(LC50 values)were determined using acute toxicity tests within an exposure time of 30 min with 0,6,12,24,and 48 mg mL^-1 *** median inhibition effect(IC50 value)on the growth of the ciliate cells was examined using chronic toxicity tests within 5 days(120 h)after exposure for 30 min with 0,0.7,3.5,7,and 14 mg mL^-1 *** 30-min LC50value was 10.66-mg mL *** LC50 values decreased with increasing exposure times and well fitted to the toxicity curve equation LC50=10.93+28.4e^-0.19t(R2=0.93;P<0.05,t=exposure time).The IC50 value for growth rates was 7.05 mg mL^-1,and the inhibition effect on growth rates well fitted to the model equation r%=0.8681e^-0.0782Cgem(r%means growth rate with inhibition by gemcitabine,Cgem means concentrations of gemcitabine,R^2=0.99 and P<0.05).The LC50 values of a wide range of gemcitabine concentrations could therefore be predicted for any given exposure *** results suggest that the clinical dose of gemcitabine(20 mg mL^-1)was higher than the 30-min LC50 value,which was almost the same as the 6-min LC50 value(19.88 mg mL^-1)for *** *** results also demonstrate that *** can be used as a robust test organism for bioassays of chemotherapeutic drugs during short exposure periods.

关键词： bioassay cytotoxicity Euplotes vannus gemcitabine toxicology

Insights into community-based bioassessment of environmental quality status using microphytobenthos in estuarine intertidal ecosystems

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Acta Oceanologica Sinica 2016年第6期35卷 112-120页

作者： DU Guoying CHUNG Ik kyo xu henglong College of Marine Life Science Ocean University of China Division of Earth Environmental System Pusan National University

The feasibility of community-based bioassessment of environmental quality status was studied using microphytobenthos（MPB） in estuarine intertidal *** sediment samples of MPB were collected monthly during a 1-year cycle（September 2006-August 2007） at four sampling stations in the Nakdong River Estuary,*** variables,such as salinity,radiation,grain size of sediment,Si（OH）4（Si）,nitrate（NO3^-）,nitrite（NO2^-）,ammonium（NH4~＋） and phosphates（PO4^（3-））,were measured synchronously for comparison with biotic *** statistical analyses were carried out for assessment the relationship between biotic and environmental *** results showed that：（1） the MPB community structures were significant differences among four sampling stations;（2） spatial variation in the MPB communities were significantly correlated with environmental variables,especially the nutrient NH4＋ in combination with salinity and grain size;（3） three species（Navicula lacustris,Pleurosigma anglulatum and Fragilaria sp.1） were significantly correlated with nutrients and/or Si;and（4） the species richness and diversity were significantly correlated with the grain *** is suggested that MPB communities may be used as a potentially robust bioindicator for assessing environmental quality status in estuarine intertidal ecosystems.

关键词： marine bioassessment field community microphytobenthos estuarine intertidal ecosystem Nakdong River

Colonization features of marine biofilm-dwelling protozoa in Chinese coastal waters of the Yellow Sea

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Marine Life Science & Technology 2020年第3期2卷 292-301页

作者： Mohammad Nurul Azim Sikder henglong xu Alan Warren Laboratory of Microbial Ecology Ocean University of ChinaQingdao 266003China Institute of Marine Sciences University of ChittagongChittagong 4331Bangladesh Department of Life Sciences Natural History MuseumLondon SW75BDUK

Colonization features of biofilm-dwelling protozoa,especially ciliates,are routinely used as a useful tool for marine *** this review,we summarize some of these features to develop an optimal sampling strategy for using biofilmdwelling protozoa as bioindicators of marine water *** focus on the utility of:(1)diversity in dices to analyze the colonizahon features of biofilm-dwelling protozoa for monitoring marine water quality;(2)MacArthur-Wilson and logistic equation models to determine spatio-temporal variations in colonization dynamics;and(3)homogeneity in taxonomic breadth of biofilm-dwelling protozoa during the process of *** main findings are that:(1)the colonization dynamics of biofilm-dwelling protozoa are similar at depths of 1-5 m in spring and autumn;(2)temporal variability was well fitted to the MacArthur-Wilson and logistic models(P<0.05);and(3)species composition reached an equilibrium after a colonization period of 10-14 days in spring and autumn,but this took less time in the summer and more time in the ***-plotting tests demonstrated spatial variability in homogeneity in taxonomic structure of the ciiiate communities at different depths in the water column,with high levels at 1 m and 2 m and lower levels at 3.5 m and 5 ***,the findings of this review suggest that the colonization dynamics of biofilin-dwelling protozoa may be influenced by different depths and seasons in coastal waters and 1-2 m in spring and autumn may be optimal sampling strategy for bioassessment on large spatial/temporal scales in marine ecosystems.

关键词： Bioassessment Colonization survey Marine ecosystem Periphytic ciliates Taxonomic breadth Seasonal and vertical variations

Planktonic protist communities in semi-enclosed mariculture waters: temporal dynamics of functional groups and their responses to environmental conditions

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Acta Oceanologica Sinica 2010年第4期29卷 106-115页

作者： xu henglong WARREN Alan AL-RASHEID Khaled A S ZHU Mingzhuang SONG Weibo Laboratory of Protozoology Institute of Evolution and Marine Biodiversity Ocean University of China Qingdao 266003 China Department of Zoology Natural History Museum Cromwell Rd London UK Zoology Department King Saud University Riyadh 11451 Saudi Arabia

The functional groups of planktonic protist communities and their responses to the changes of environmental conditions were investigated in a semi-enclosed shrimp-farming pond in Qingdao,Shandong Province,China,during a six-month study period （a complete shrimp-culture cycle） from May to October *** results reveal that：（1） the protist communities represented five trophic and functional groups of the species identified,about 60% were photoautotrophs,20% algivores,12% bacterivores,5% raptors and about 3% non-selectives;（2） the photoautotrophs,algivores and bacterivores were the primary contributors to the changes in the protist communities in short temporal scales,the succession of dominance typically being bacterivores→photoautotrophs→algivores,with the raptors dominating the protist communities in a single sample （early June）;（3） the photoautotrophs and non-selectives were the primary contributors to the peak of protist abundance in early October whereas the photoautotrophs,bacterivores,raptors and non-selectives mainly gave rise to two bimodal peaks of biomass in July and October respectively;（4） five functional groups of protist communities represented significant correlations with water nutrients （i.e.,NH 3-N,NO 3-N,and PO 4 ）,either alone or in combination with temperature,of which algivores and raptors were strongly correlated with phosphate and the concentration of Chl a,while bacterivores were strongly related to nitrogen and the concentration of *** findings confirm that planktonic protists are potentially useful bioindicators of water quality in the semi-enclosed mariculture system.

关键词： environmental stress planktonic protists functional group microbial ecology marimculture

Temporal species distributions of planktonic protist communities in semi-enclosed mariculture waters and responses to environmental stress

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Acta Oceanologica Sinica 2010年第3期29卷 74-83页

作者： xu henglong ZHU Mingzhuang JIANG Yong AL-RASHEID Khaled A S Laboratory of Protozoology Institute of Evolution and Marine Biodiversity Ocean University of China Qingdao 266003 China Zoology Department King Saud University Riyadh 11451 Saudi Arabia

In order to evaluate the relationships between temporal species succession of planktonic protists and physical-chemical parameters in semi-enclosed mariculture waters, species distributions in response to environmental stress were investigated in a shrimp-farming pond near Qingdao, China during a complete shrimp-culture cycle （May to October 2002）. A clear temporal succession in species distribution was found over the complete farming cycle. For example, before the introduction of the shrimp larvae there was low-variability of species distribution in the protist communities whereas during the stages immediately after, there was higher variability in species composition. Multiple linear/logistic regression analyses demonstrate that 12 protist taxa （e.g., Gyrodinium spirale, Teleaulax acuta, Prorocentrum spp. and Mesodinium pupula） were related to the nutrients, in particular ammonia and phosphates, alone or in combination with water temperature. These results suggest that temporal variations in species distribution of planktonic protist communities might be used in assessing water quality of semi-enclosed mariculture waters.

关键词： environmental stress mariculture planktonic protist microbial ecology

Characterization of marine microplankton communities of Qingdao coastal areas using randomly amplified polymorphic DNA(RAPD)

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Acta Oceanologica Sinica 2009年第1期28卷 55-61页

作者： GAO Shan HU Xiaozhong CHEN Zigui xu henglong YI Zhenzhen LIN Xiaofeng LI Jiqiu Laboratory of Protozoology Key Laboratory of Maricuhure Ocean University of China Qingdao 266003 China Laboratory of Protozoology College of Life Science South China Normal University Guangzhou 510631 China

Microplankton communities of three coastal sites of Qingdao,Shandong Province,China were investigated using RAPD（random amplified polymorphic DNA） molecular markers and morphological *** RAPD-primers were selected to amplify the DNA *** genetic distances inferred from the pairwise similarities were calculated for the phylogenetic tree ***,the traditional microscopic determination,a way of visualizing the species composition,was performed to detect the major taxa of microplanktons from all *** showed that：（1） the band sharing index values were in the range of 0.504 2-0.763 2 among samples from the same sampling site at different time scales,while 0.406 5-0.685 7 among the samples from different stations at the same time scales,indicating that spatial variations of microplankton communities were more pronounced than temporal ones;（2） samples from the same station basically clustered together,corresponding to the geographic distribution of the sampling sites;（3） diversity derived from genetic and morphological data did not correspond with each other well.

关键词： marine plankton RAPD community diversity phylogeny

Annual pattern of zooplankton communities and their environmental response in a subtropical maritime channel system in the northern Bay of Bengal, Bangladesh

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Acta Oceanologica Sinica 2018年第8期37卷 65-73页

作者： ABDULLAH Al Mamun ALAM Md.Didarul AKHTAR Aysha xu henglong ISLAM Md.Shafiqul MUSTAFA KAMAL Abu Hena UDDIN M Muslem ALAM Md.Wahidul Laboratory of Microbial Ecology Ocean University of China Faculty of Marine Sciences and Fisheries University of Chittagong Department of Animal Science and Fishery Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Campus Bintulu

Zooplankton plays an important role in aquatic food webs by fluxing of energy from primary producer to subsequent trophic levels in the food chain. The annual pattern of zooplankton communities and potential environmental drivers were studied in the Kohelia channel, Bangladesh from summer 2014 to spring *** were collected using net at a depth of 1 m. A total of 32 species belonged to 18 orders, 27 families and 15 taxonomic groups were identified. Of these species, 22 distributed in all four seasons of which 8 were dominant and highly contributing to the total communities. Species number peaked in summer next to winter and fall in spring while maximum abundance was in summer and minimum in spring. Multivariate analyses showed that there was a clear annual pattern in the zooplankton communities. Species diversity and evenness peaked in spring but fall in autumn while the high value of species richness was found in winter. Biological-environmental best matching（BIO-ENV） analyses conformed that community pattern of zooplankton was mainly driven by transparency salinity, and temperature individually or combined with water nutrients. These results demonstrate that annual pattern of the zooplankton community shaped by channel environmental factors in subtropical channel ecosystems, thus might be used for community-based subtropical coastal water bioassessment.

关键词： zooplankton trophic levels subtropical channel community structure multivariate approach

Colonization of periphytic ciliated protozoa on an artificial substrate in mariculture waters with notes on responses to environmental factors

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Progress in Natural Science:Materials International 2009年第10期19卷 1235-1240页

作者： Jiqiu Li a,b,henglong xu b,Xiaofeng Lin a,Weibo Song a,b a Laboratory of Protozoology,Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education,South China Normal University,Guangzhou 510631,China b Laboratory of Protozoology,KLM,Ocean University of China,Qingdao 266003,China Laboratory of Protozoology Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education South China Normal University Guangzhou 510631 China Laboratory of Protozoology KLM Ocean University of China Qingdao 266003 China

Colonization of periphytic ciliates and their usefulness for monitoring water quality were evaluated using the glass slide method in two enclosed mariculture ponds used to culture crab larva and in a natural seawater *** results revealed that(1) the ciliate species composition and colonizing process differed between the culturing ponds and the natural reservoir and(2) the dominant ciliate species showed a greater distribution in terms of both the abundance and the occurrence *** study also demonstrated that structural parameters were strongly related to water *** example,the abundance was positively associated with NO3-N and soluble reactive phosphate(P < 0.05),whereas the species number,species diversity and evenness were negatively correlated with nutrients(***3-N and NH3-N) and temperature(P < 0.05).These findings support the evidence that periphytic ciliates are useful bioindicators of water quality in enclosed mariculture ecosystems.

关键词： Periphytic ciliates Colonization process Environmental factors