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Abundance and distribution of meiofauna in the Chukchi Sea

Acta Oceanologica Sinica 2014年第6期33卷 90-94页

作者： LIN Rongcheng HUANG Dingyong GUO Yuqing CHANG Yu CAO Yinkun WANG Jianjia Third Institute of Oceanography State Oceanic Administration Key Laboratory of Marine Fishery Resources and Ecological Environment of Fujian Province Fisheries CollegeJimei University

The metazoan meiofauna in the Chukchi Sea were collected from seven shallow water stations （depths rang- ing 46 to 52 m） and five deep sea stations （depths ranging between 393 and 2 300 m） during the 4th Chinese National Arctic Research Expedition in 2010. The results showed that abundance of meiofauna was higher in shallow water sediments （average of 2445 ind./（10 cm2）） than in deep sea sediments （407.06 ind./（10 cm2））. A UNIANOVA test for difference between the two different regions was highly significant （F=10h 15, p〈***）. Nematodes were numerically dominant, representing （96.6±4.6）% of the total meiofaunal abundance at the shallow water stations and （98.90±1.42）% at deep sea stations. The number of higher taxonomic groups and abundance of meiofauna were higher at Stas CC1, CC4, and R06 near the Bering Strait and the continent, than at the rest of the shallow water and deep sea stations. The primary factors causing the differences were concentrations of nutrients P and Si of bottom seawater （R=0.831, p〈0.003）, followed by depth （R=-0.655, p〈0.05） and sand fractions of sediments （R=0.632, p 〈0.05）. The numbers of meiofauna on the 65 lam and 32 llm sieves were significantly higher than those on the rest of the screens. Differences in numbers of meiofauna retained on screens with different mesh openings were highly significant among all sampling stations （F=31.60, p〈0.01）. The highest numbers of individuals on screens with 32 μm mesh openings were found at deep sea stations. The number of meiofauna in the top 6-1, 1-2, and 2-4 cm segments constituted 84.4% of the total and was significantly higher than those in the bottom 4-6 and 6-10 cm segments （F=15, p〈0.01）.

关键词： Chukchi Sea meiofauna abundance vertical distribution size spectra deep sea

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Numerical Simulation of Effects of Cloud Top Temperatures and Generating Cells on Secondary Ice Production in Stratiform Clouds with a Detailed Microphysical Model

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Atmospheric and Oceanic Science Letters 2012年第2期5卷 75-81页

作者： Yang Jie-Fan Lei Heng-Chi Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This paper outlines a one-dimensional,heightdependent bin model with detailed microphysical processes in which ice splinters are produced by a riming *** model is then applied to simulate the shift of particle size distribution effected by the secondary ice production process within clouds with different generating cells and cloud top *** result of model simulations reveals the general effects of cloud updrafts on increasing ice particle concentration by extending the residence time of ice particles in clouds and providing sufficiently large supercooled water *** rimesplintering mechanism is more effective in clouds with lower ice seeding rates than those with higher *** of hydrometeor size distribution triggered by the rime-splintering mechanism indicate that the interaction between large ice particles and supercooled water drops adds a "second maximum" to the primary ice spectra.

关键词： multiplication generating cells bin model size spectra

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The Living Whirl Self-Maintenance of Stable size Structure Patterns of Aquatic Communities

The Living Whirl Self-Maintenance of Stable Size Structure P...

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作者： Yury Kamenir The Mina & Everard Goodman Faculty of Life Sciences Bar-Ilan University

Our aim was to analyse size structure typical patterns of phytoplankton and mechanisms explaining such pattern generation and ***-time study of the size structure of integral phytoplankton and their main phyla was carried out in considerably different aquatic *** types of statistical distributions and quantitative indices of the pattern similarity were applied to find reliable patterns suitable for ecological *** with apparently unsystematic shifts in the taxonomic composition,the emergence and long-time restoration of extremely analogous spreading patterns of the integral phytoplankton and their main taxonomic parts were *** biodiversity histogram(FTSS) pattern steadiness was found for integral phytoplankton *** changes in the FTSS fine structure of some phytoplankton phyla were *** phyla were remarkably susceptible to environmental *** phyla can serve for ***-tailed asymmetric histograms were established as enduring traits elucidated by a multi-stressor mechanism of aquatic assemblage *** patterns and quantitative similarity indices can characterize integral assemblage *** patterns can be applied to develop mathematical models elucidating multi-stress proliferation in hierarchical structures of aquatic *** structural patterns of large-scale aquatic assemblages can help in ecological modelling,aquatic management,and forecast.

关键词： Aquatic Communities Biodiversity Distribution Ecosystem Restoration Monitoring Multidisciplinary Studies Multistress System Phytoplankton Similarity size spectra Typical Pattern

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Seasonal Variations in Fishery Resources in Shenzhen Sea Area

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Asian Agricultural Research 2017年第9期9卷 40-46页

作者： Jiangmei MAO Huarong YUAN Jing YU Pimao CHEN Qiwei HU South China Sea Fisheries Research Institute CAFS/Key Laboratory of Fishery Ecology and EnvironmentGuangdong Province/Scientific Observing and Experimental Station of South China Sea Fishery Resources and EnvironmentMinistry of Agriculture/Key Laboratory of Marine Ranching TechnologyCAFS College of Marine Science Shanghai Ocean University

Seasonal variations and causes for these were elaborated for fishery resources in Shenzhen sea area,to provide scientific basis for sustainable utilization and management of fishery resources in typical fisheries of South China Sea coasts. Based on the data of fishery resources collected through trawl surveys in Egong Bay fisheries area,Shenzhen,from August( autumn) and December( winter) of 2012 to March(spring) and May(summer) of 2013,seasonal variation of nekton species composition,stock density,dominant species composition,size spectra and biodiversity were studied. Results showed that there were 113 species of nekton in Shenzhen sea area,which belonged to 78 genus,50 families,14 orders and 3 classes. The number of species was the largest in summer(61 species) and smallest in autumn(53 species). In spring and winter,there was 56 species. The stock density and individual density of nekton were the minimum in summer(5950. 20 kg/km2 and 356. 45 ind/km2,respectively),whereas the percentage of fish stock density and individual density were the highest in summer(51. 99%and 42. 19%). The seasonal variations of size spectra indicated that fishing intensity was the highest in autumn,and was the lowest in summer. Additionally,biodiversity index presented significant seasonal variations,including Shannon-Wiener diversity index( H '),Margalef richness index( D') and Pielou evenness index( J'),with the same trend as summer > spring > autumn > winter. In conclusion,there are clear seasonal variations in the nekton species,biomass and structure in Egong Bay fisheries area in Shenzhen. Due to the difference in fishing intensity in different seasons( low intensity in summer and high intensity in autumn),community structure and function in summer are more stable than that in autumn and winter. Particularly,with the increase in the fishing intensity in autumn,k selection species will be replaced by r selection species.

关键词： Fishery resources Seasonal variations Stock density Dominant species size spectra Biodiversity Shenzhen Sea Area

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