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Meiofauna distributions at the oxygen minimum zone in Changjiang (yangtze) River Estuary waters

Acta Oceanologica Sinica 2006年第5期25卷 120-134页

作者： hua er zhang zhinan zhang yan College of Marine Life Science Ocean University of China Qingdao 266003 China

A quantitative study on meiofauna was carried out along a transect throughout the Changjiang Estuary＇ s oxygen minimum zone （OMZ） in the East China Sea. There exist two distinct station groups in the OMZ： the fine-grained hypoxic area and the more fine-grained anoxie area. Meiofauna abundance ranged from （ 101.5±31.0） ind./cm^2 （ hypoxie area） to （369.9±123.9） ind./cm^2（ anoxic area） along the transect. Free-living marine nematodes were the numerically dominant meiofauna at every station. The anoxic area differed significantly in meiofauna abundance and vertical distribution pattern from the hypoxic area. Within the anoxic area, nematodes abundance increased and amounted to over 90% of the total meiofauna; about 50% of nematodes were found in the 2-5 and 5-8 cm layers. At hypoxie stations, about over 85 % were restricted to the top 2 cm. Benthic eopepod abundance and dominance decreased consistently with the oxygen gradient. The pattern of meiofauna biomass was similar to that of abundance. The correlation analysis of the meiofauna numbers and environmental parameters indicated that abundance and biomass of total meiofauna and nematodes had significant or highly significant （ P 〈 0.05 or P 〈 0.01 ） correlations with Chl a and Pha a, but no significant （ P 〉 0.05 ） correlations with bottom-water oxygen （ BWO2 ）. On the other hand, there was a highly significant positive correlation between benthic eopepod abundance and bottom-water oxygen （P 〈 0.05 ）. The investigation on the nematode community structure indicated that two different nematode communities existed in hypoxic and anoxic areas. In certain way, the shift in nematode species composition distinguishes the anoxia to hypoxia. Nematode diversity was generally lower within the anoxic stations than the hypoxic ones, but the difference was not significant. Indices of the nematode community structure varied in relation to the bottom-water oxygen together with bottom-water temperature, Chl a concentration and median

关键词： meiofauna free-living marine nematodes oxygen minimum zone hypoxia anoxia Changjiang estuary EastChina Sea

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Meiofaunal Community Spatial Distribution and Diversity as Indicators of Ecological Quality in the Bohai Sea, China

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Journal of Ocean University of China 2021年第2期20卷 409-420页

作者： CUI Chunyan zhang zhinan hua er College of Marine Life Sciences Ocean University of ChinaQingdao 266100China

The Bohai Sea is a semi-enclosed marginal sea in the North West Pacific. Meiofauna samples were collected from 22 stations in the Bohai Sea to document the spatial distribution, structure, and diversity of the meiofaunal community and investigate the major factors influencing the community features. A total of 20 higher taxa of meiofauna were identified. The dominant group was Nematoda, accounting for 90.8% of the total meiofaunal abundance on average, followed by Copepoda, Bivalvia, Polychaeta, Kinorhyncha, and Ostracoda. Meiofaunal abundance ranged from 121 ± 89 ind(10 cm2)-1 to 3042 ± 1054 ind(10 cm2)-1. Diversity indices also varied among different stations, with a Margalef's richness index(d) of 1.1–3.1, Shannon-Wiener diversity index(H′) of 0.7–1.8, and Pielou's evenness index(J′) of 0.4– 0.8. Meiofaunal abundance and diversity indices were significantly lower in the areas of Bohai Bay and adjacent to Laizhou Bay. The correlation analysis showed that meiofaunal abundance and diversity indices are closely linked to variations in sediment silt-clay content, medium grain size(MDΦ), and chlorophyll-a concentrations. The ecological quality status of most stations can be ranked from poor to moderate based on meiofaunal richness. According to the value of nematode to copepod ratio(Ne:Co ratio), most stations are uncontaminated, except seven stations are slightly or moderately contaminated. Both meiofaunal richness and Ne:Co ratio indicate the poor ecological quality of three stations adjacent to Laizhou Bay. The efficiency of the meiofauna communities as environmental indicators will be tested in a greater area in the future studies.

关键词： meiofauna spatial distribution biodiversity ecological quality the Bohai Sea

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Four Newly Recorded Free-living Marine Nematodes(Comesomatidae) from the East China Sea

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Journal of Ocean University of China 2007年第1期6卷 26-32页

作者： hua er zhang zhinan College of Life Science and Technology Ocean University of ChinaQingdao 266003P.R.China

Three species in genus Sabatieria and one in genus Cervonema from the East China Sea were recorded. S. breviseta is characterized by uniformly punctuated coarse dots, large amphids of 5.5 turns (♂) and prominent gubernaculum median piece. The characters of S. breviseta agree quite well with the European original descriptions and only differ in the male amphid turns (5.5 vs. 4.0 turns) and unmodified preanal supplements (5-7 vs. 6). S. pulchra can be recognized by amphid 2.75 turns, irregularly arranged lateral dots, and the first three supplements anterior to the anus, which are more widely spaced than the following ones. The excretory system of S. breviseta and S. pulchra shows sexual dimorphism. S. celtica is defined by amphids 2.00-2.25 turns, weakly developed pharyngeal bulb, curved apophyses and 12-13 conspicuous supplements. C. deltensis is characterized by amphids 4.75 turns, ovate pharyngeal posterior bulb, sperm dimorphism, 7 thin preanal supplements, and long tail cylindrical portion (50%-53% of tail length). All the three Sabatieria species are for the first time recorded in Chinese waters. C. deltensis was originally isolated from the Bohai Sea and Yellow Sea and newly recorded in the East China Sea.

关键词： Comesomatidae Sabatieria Cervonema free-living marine nematodes East China Sea

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Biodiversity of Free-Living Marine Nematodes in the Southern Yellow Sea,China

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Journal of Ocean University of China 2016年第1期15卷 1-10页

作者： LIU Xiaoshou XU Man hua er zhang zhinan College of Marine Life Sciences Ocean University of China

Biodiversity pattems of free-living marine nematodes were studied using specific, taxonomic and phylogenetic diversity measures in the southern Yellow Sea, China. The results showed that the average of Shannon-Wiener diversity index （H＇） in the study area was 3.17. The higher values were distributed in the east part of Shandong coastal waters and north part of Jiangsu coastal waters, while the lower values were distributed in the southern Yellow Sea Cold Water Mass （YSCWM）. The average of taxonomic diversity （A） was 62.09 in the study region. The higher values were distributed in the transitional areas between the coastal areas and the southem YSCWM, while the lower values were distributed near the north part of Jiangsu coastal waters and the YSCWM. Results of correlation analysis of species diversity and taxonomic diversity showed that some of the two kinds of diversity index were inde- pendent, which suggested that combining the two kinds of diversity indices can reflect the ecological characteristics better. A test for 95% probability funnels of average taxonomic distinctness and variation in taxonomic distinctness suggested that Station 8794 （in the YSCWM） was outside of the 95% probability funnels, which may be due to the environmental stress. Results of correlation analysis between marine nematodes biodiversity and environmental variables showed that the sediment characteristics （Mdo and Silt-clay fraction） and phaeophorbide a （Pha-a） were the most important factors to determine the biodiversity patterns of marine nematodes.

关键词： species diversity taxonomic diversity flee-living marine nematode southem Yellow Sea

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Seasonal variability in free-living marine nematode community structure in a sandy beach of the Taiping Bay of Qingdao,China

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Acta Oceanologica Sinica 2008年第2期27卷 102-115页

作者： LIU Haibin zhang zhinan FAN Shiliang hua er DENG Ke College of Marine Life Science Ocean University of China Qingdao 266003 China Liaoeheng Agriculture Bureau Liaocheng 252000 China

Nematode assemblage composition, trophic structure and biodiversity were followed over an annual cycle in a sandy beach of the Taiping Bay of Qingdao, China. Nematode assemblage in the sandy beach maintained a high genus diversity （75 genera）. Mlero- laimus and Bathylaimus were the dominant genus of the nematode assemblage, accounting for 66% of the total nematode abundance. The nematodes＇ dominant trophic structure changed seasonally as a response to the seasonal changes in food quality. Epigrowth-feeder nematodes （2A） were the dominant trophic groups in the trophic structure with the highest abundance in spring because of phytoplankton bloom, while the feeding type （ 1 B） showed higher abundance in summer that was due to the increasing of sediment detritus after spring bloom. Furthermore, species diversity and evenness calculated on nematodes identified to the genus level displayed significant temporal changes, which was also reflected by the index of trophic diversity. According to the cluster analysis, the nematode community structure of the whole year was clearly separated into two periods （A and B）. Biota-Envlron- ment matching （BIOENV） results showed that seawater temperature, sediment Chl a and grain size were responsible for the nema- tode community structure variation in spring and summer period （Period A）. However, seawater/interstitial water temperature, interstitial water dissolved oxygen concentration,interstitial water salinity, and sediment Ph a a were more important in constructing the autumn and winter period （Period B） nematode community structure.

关键词： nematode assemblage composition trophic structure temporal change Taiping Bay of Qingdao

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Taxonomic Distinctness of Macrofauna as an Ecological Indicator in Laizhou Bay and Adjacent Waters

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Journal of Ocean University of China 2010年第4期9卷 350-358页

作者： ZHOU Hong hua er zhang zhinan College of Marine Life Sciences Ocean University of China Qingdao 266003 P. R. China

In this paper, we assessed the ecological and biodiversity status in the Bohai Sea through a quantitative survey on mac-rofaunal community at 25 stations in Laizhou Bay and adjacent waters in the autumn of *** tested the robustness and effectiveness of taxonomic distinctness as an ecological indictor by analyzing its correlation with species richness and natural environmental variables and by analyzing other ecological indicators (Shannon-Wiener H' and W statistics from Abundance Biomass Comparison curve).Results so obtained indicated that the benthic environment of the study waters in general is not under major impact of anthropogenic disturbance, but some stations in Laizhou Bay and along the coast of the Shandong Peninsula and even in the central Bohai Sea might be moderately disturbed and showed signs of ecological *** taxonomic distinctness measures △+ and Λ+ were independent of sampling effort and natural environment factors and were compliant to other ecological *** application of the taxonomic distinctness indicator to assess marine biodiversity and ecosystem health on a larger regional scale with historical data seems promising.

关键词： Taxonomic distinctness macrofauna ecological indicator biodiversity Laizhou Bay Bohai Sea

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Nematode Community Structure and Diversity Pattern in Sandy Beaches of Qingdao,China

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Journal of Ocean University of China 2016年第1期15卷 33-40页

作者： hua er MU Fanghong zhang zhinan yanG Shichao zhang Ting LI Jia College of Marine Life Sciences Ocean University of China

We investigated the diversity and structure of free-living marine nematode communities at three sandy beaches representing typical intertidal environments of a temperate zone in Qingdao,Shandong Province,*** nematode abundance ranged from 1006 to 2170 ind.10 cm-2,and a total of 34 nematode genera were recorded,of which only 8 were common in all the studied ***'s evenness and Shannon-Wiener diversity index were the lowest at the second beach where nematode abundance was the *** highest species diversity index coincided with the lowest nematode abundance at Shilaoren *** median grain size,sorting coefficient,and chlorophyll-a content were essential for differentiation in nematode abundance and species diversity,whereas taxonomic diversity of nematode was homogeneous across the three *** 0–20 cm sediment profile,nematode abundance declined abruptly with depth,whereas nematode diversity changed gently with obvious difference in 16–20 cm *** granulometry and chlorophyll-a content were the two foremost factors which influenced the vertical distribution pattern of nematode generic ***-selective deposit feeders constituted the most dominant trophic group,followed by epistratum ***(family:Tripyloididae) dominated at the second and yangkou beach,while Theristus(family:Xyalidae) prevailed at Shilaoren *** and predators became important at Shilaoren beach because of the high proportion of *** though,nematode community of the studied beaches did not differ significantly from each other.

关键词： vertical distribution biodiversity taxonomic diversity index trophic structure

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Estimates of Autumntime Benthic Secondary Production in Laizhou Bay and Adjacent Bohai Sea Waters

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Journal of Ocean University of China 2010年第3期9卷 279-285页

作者： hua er ZHOU Hong zhang zhinan YU Zishan ~ College of Marine Life Science Ocean University of China Qingdao 266003 P. R. China

The whole metazoan community inhabiting Laizhou Bay and adjacent Bohai Sea waters were sampled in late autumn, 2006. Secondary production estimates for macrofauna and meiofauna were made separately. Total benthic secondary production was as high as 8.38 ±4.08 g ash-free dry weight （AFDW） m^-2 a^-1, which represented the autumn production level. In general, macrofaunal secondary production in Laizhou Bay was much lower than that in adjacent Bohai Sea areas. In contrast, meiofaunal secondary production in Laizhou Bay was higher than that in adjacent Bohai Sea areas. Macrofatma contributed 61% to benthic secondary production （5.09 ±3.26 g AFDW m^-2 a^-1）, lower than the value in previous studies in Bohai Sea. Sediment granulometric characteristics and bottom-water salinity could explain the substantial variability in the macrofauna biomass and production. Meiofaunal production was an important component of benthic production and exceeded macrofauna production under exceptional conditions, e.g. in Laizhou Bay, where macrofauna was restricted. Chlorophyll pigments （Chl-a） concentrations in sediment explained the general meiofaunal biomass and production distribution here.

关键词： benthic secondary production meiofauna macrofauna Laizhou Bay the Bohai Sea

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Meiofauna Distribution in Intertidal Sandy Beaches Along China Shoreline(18?–40?N)

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Journal of Ocean University of China 2016年第1期15卷 19-27页

作者： hua er zhang zhinan ZHOU Hong MU Fanghong LI Jia zhang Ting CONG Bingqing LIU Xiaoshou College of Marine Life Science Ocean University of China

In this study,the distribution pattern of meiofauna from nine sandy beaches at six latitudinal gradients along Chinese coast between 18 and 40?N was studied on their meiofauna abundance to examine the effect of latitudinal *** general,meiofauna abundance was lower in four subtropical beaches in Xiamen(24?N) and Zhoushan(29?N) than that in other *** abundance differed little between tropical and temperate *** taxonomic structure of meiofauna showed a dominance of nematode in colder *** relative composition of turbellarians and polychaetes increased in warmer *** addition to latitudinal gradient,salinity,oxygenation,sediment grain size affect also the meiofauna latitudinal *** for horizontal distribution,the highest meiofauna abundance was found in low tidal zone at tropical beaches,and in middle tidal zone at temperate *** horizontal distribution of meiofauna was controlled by both physical and biotic factors including feeding and anthropogenic *** meiofauna abundance exhibited a horizontal difference,the composition of meiofaunal main taxa was unanimous horizontally at all beaches at the same sampling latitude.

关键词： meiofauna sandy beach abundance horizontal distribution latitudinal variation China

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[Ca^(2+)]_i change in hippocampal neurons influenced by preconditioning of etomidate fat emulsion following cerebral ischemia in rats

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Neural Regeneration Research 2007年第11期2卷 645-648页

作者： Xiuhua Li er Gao yan zhang Division of Cntical Care Medicine Department of Anesthesiology Weifang Medical College Weifang 261042 Shandong Province China

BACKGROUND： It is known that intravenous anesthetic etomidate fat emulsion has cerebral protection. Now many scholars focus on the research of its cerebral protection from molecular biology, but the mechanism of cerebral protection is still fully unclear. OBJECTIVE： To observe the influence of etomidate fat emulsion on the [Ca^2＋]i in hippocampal neurons during the transient cerebral ischemia injury in rats. DESIGN： Randomized controlled observation. SETTING： Weifang Medical College. MATerIALS： This study was carried out in the functional laboratory of Weifang Medical College between October 2005 and March 2006. Twenty-four male healthy Wistar rats, aged 3 to 4 months, were involved. Etomidate fat emulsion was provided by the limited company of En-hua Medical Bloc in Jiangsu Province （code of H200205l l） and the other agents and materials were provided by Laboratory Center of Weifang Medical College. METHODS： The 24 Wistar rats were randomized into 3 groups： sham-operation group, model group and etomidate preconditioning group, with 8 rats in each. Rat models of transient cerebral ischemia injury were made by the ligation of bilateral carotid arteries combined with descending blood pressure in the latter two groups. Before ischemia （ligation of bilateral common carotid artery）, rats in the etomidate preconditioning group were intraperitoneally injected with 12 mg/kg etomidate fat emulsion and then persistently intraperitoneally injected with etomidate fat emulsion at 1.0 mg/kg per minute. Rats in the model group were not administrated. Rats in the sham-operation group were only performed bilateral common carotid artery isolation. When rats were modeled, their brain tissues were quickly taken out and detected. MAIN OUTCOME MEASURES： Change of the fluorescence pixel value of the [Ca^2＋]i in each group by the laser scanning confocal microscope. RESULTS： Twenty-four rats were involved in the final analysis. Fluorescence pixel value in the sham-operation group

关键词： etomidate fat emulsions [Ca^2+]i

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