To understand the characteristics of population structure of planktonic copepods and their response mechanisms to marine environmental factors in different seasons,the community structure of planktonic copepods in sam...To understand the characteristics of population structure of planktonic copepods and their response mechanisms to marine environmental factors in different seasons,the community structure of planktonic copepods in samples obtained from 7 stations in artificial reefs of Wenchang,Hainan Province in March and September 2019 were investigated.A total of 33 species of planktonic copepods belonging to 23 genera within 17 families were identified in artificial reefs,with 27 species and 21 genera in spring,and 23 species and 19 genera in fall,respectively.The identified planktonic copepods were further categorized into estuarine groups,warm temperate groups,warm water coastal groups,and warm water widespread groups.The predominant species in spring were mainly composed of Temora turbinata and Canthocalanus pauper,whereas Tortanus gracilis and Subeucalanus subcrassus were dominant species in fall.The species and abundance of planktonic copepods in spring were higher than that in fall,while the diversity index and evenness were vice versa,with obvious seasonal differences.In addition,there was a correlation between the population of copepods and physicochemical environmental factors.The major warm water group of copepods in spring showed different degree of correlation with environmental factors,such as NO2-N,NH3-N,pH,water depth,temperature etc.,while the population of copepods in fall was affected by limiting factors such as dissolved oxygen,pH,and temperature.In conclusion,copepods species inartificial reefs were rich and diverse,and their community structure tended to be stable.In addition,the surrounding water quality was generally good,and the whole marine ecosystem and ecological environment were in good condition.展开更多
The structure of phytoplankton communities in waters of mangrove natural reserve in Hainan Island was studied in June 2009.The results showed that most of phytoplankton were diatoms in the waters of mangrove.The domin...The structure of phytoplankton communities in waters of mangrove natural reserve in Hainan Island was studied in June 2009.The results showed that most of phytoplankton were diatoms in the waters of mangrove.The dominant species were Skeletonema sp.,Cyclotella caspia,Nitzschia closterium and Oscillatoria sp.Some taxa belonging to Euglenophyta,Pyrrophyta and Chlorophyta also occurred in the water.Totally 97 species(including variety)in 46 generas were identified,in which 59 species in 25 genera belonged to Bacillariophyta,and 18 species in 9 genera for Chlorophyta,10 species in 7 genera for Cyanophyta,4 species in 2 genera for Euglenophyta,5 species in 5 genera for Pyrrophyta,1 specie for Chrysophyta,respectively.The cell abundance of phytoplankton ranges from 289.9 x 103 to 1964.9 ×10^3 cells/L,with an average of 885.3 ×10^3 cells/L.According to composition and structure of phytoplankton communities,the water quality in mangrove areas was in good condition.But in Xinying Harbour,Sanya River and Caiqiao the water quality might be degraded,which should be paid attention to.展开更多
Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences...Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences on marine ecosystems.By using relative indexes of landscape science,this article makes quantitative research on reclamation indexes of Zhejiang Province,China from1990to2000in a macro-region perspective,and the results shows that:(1)within20years,the total area of reclamation in Zhejiang Province had reached108760ha,and the reclamation area of Ningbo city was the largest while Jiaxing city is the smallest;(2)the patch area,quantity,density and variable coefficients of all types of lands were markedly different,and lands in different regions also differed distinctly;(3)average form index and fragmentation index of patch of lands of different types and functions were positively correlated,and the indexes of Taizhou city and Ningbo city were relatively high while Jiaxing city and Shaoxing city were lower;(4)under the influence of factors like topographic conditions,develop needs,human activities and so on,the degree of aggregation of the types of reclamation was relatively high;(5)because of the differences in reclamation area,coast length,land type and so on,the average intensity index and diversity index of the all coastal cities were different distinctly.展开更多
The samples collected from the surface sediments in Xiangshan Bay,Zhejiang province in May and November 2005 were analyzed under a light microscope.The species composition,abundance,community structure and diversity w...The samples collected from the surface sediments in Xiangshan Bay,Zhejiang province in May and November 2005 were analyzed under a light microscope.The species composition,abundance,community structure and diversity were investigated.A total of 179 taxa belonging to 46 genera of diatom were identified.The result showed that the ecotypes of diatom were mostly eurytopic species,followed by warm water species and temperate species.The most dominant species were Cyclotella stylorum and Coscinodiscus jonesianus.The seasonal variation of diatom abundance was remarkable.The cell abundance of diatoms was higher in spring(2.974×10^3 cells/g)than that in autumn(0.071×10^3 cells/g).The number of species varies with change of season,demonstrating the adaptability of diatoms to the temperature of water.The species diversity of benthic diatom was lower in autumn than that in spring.展开更多
基金supported by Hainan Provincial Natural Science Foundation of China (No. 419QN254)
文摘To understand the characteristics of population structure of planktonic copepods and their response mechanisms to marine environmental factors in different seasons,the community structure of planktonic copepods in samples obtained from 7 stations in artificial reefs of Wenchang,Hainan Province in March and September 2019 were investigated.A total of 33 species of planktonic copepods belonging to 23 genera within 17 families were identified in artificial reefs,with 27 species and 21 genera in spring,and 23 species and 19 genera in fall,respectively.The identified planktonic copepods were further categorized into estuarine groups,warm temperate groups,warm water coastal groups,and warm water widespread groups.The predominant species in spring were mainly composed of Temora turbinata and Canthocalanus pauper,whereas Tortanus gracilis and Subeucalanus subcrassus were dominant species in fall.The species and abundance of planktonic copepods in spring were higher than that in fall,while the diversity index and evenness were vice versa,with obvious seasonal differences.In addition,there was a correlation between the population of copepods and physicochemical environmental factors.The major warm water group of copepods in spring showed different degree of correlation with environmental factors,such as NO2-N,NH3-N,pH,water depth,temperature etc.,while the population of copepods in fall was affected by limiting factors such as dissolved oxygen,pH,and temperature.In conclusion,copepods species inartificial reefs were rich and diverse,and their community structure tended to be stable.In addition,the surrounding water quality was generally good,and the whole marine ecosystem and ecological environment were in good condition.
基金supported by the China’s Offshore Marine Comprehensive Survey and Evaluation (No. HN908-01-02, No. HN908-01-05, No. HN908-02-03, No. HN908-04-02, No. HN908-04-09)the Nature Science Foundation of Hainan Province of China under contract No. 20154179
文摘The structure of phytoplankton communities in waters of mangrove natural reserve in Hainan Island was studied in June 2009.The results showed that most of phytoplankton were diatoms in the waters of mangrove.The dominant species were Skeletonema sp.,Cyclotella caspia,Nitzschia closterium and Oscillatoria sp.Some taxa belonging to Euglenophyta,Pyrrophyta and Chlorophyta also occurred in the water.Totally 97 species(including variety)in 46 generas were identified,in which 59 species in 25 genera belonged to Bacillariophyta,and 18 species in 9 genera for Chlorophyta,10 species in 7 genera for Cyanophyta,4 species in 2 genera for Euglenophyta,5 species in 5 genera for Pyrrophyta,1 specie for Chrysophyta,respectively.The cell abundance of phytoplankton ranges from 289.9 x 103 to 1964.9 ×10^3 cells/L,with an average of 885.3 ×10^3 cells/L.According to composition and structure of phytoplankton communities,the water quality in mangrove areas was in good condition.But in Xinying Harbour,Sanya River and Caiqiao the water quality might be degraded,which should be paid attention to.
基金supported by the National Natural Science Foundation of China(No.U1609203,41471004)the K.C.Wong Magna Fund of Ningbo University
文摘Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences on marine ecosystems.By using relative indexes of landscape science,this article makes quantitative research on reclamation indexes of Zhejiang Province,China from1990to2000in a macro-region perspective,and the results shows that:(1)within20years,the total area of reclamation in Zhejiang Province had reached108760ha,and the reclamation area of Ningbo city was the largest while Jiaxing city is the smallest;(2)the patch area,quantity,density and variable coefficients of all types of lands were markedly different,and lands in different regions also differed distinctly;(3)average form index and fragmentation index of patch of lands of different types and functions were positively correlated,and the indexes of Taizhou city and Ningbo city were relatively high while Jiaxing city and Shaoxing city were lower;(4)under the influence of factors like topographic conditions,develop needs,human activities and so on,the degree of aggregation of the types of reclamation was relatively high;(5)because of the differences in reclamation area,coast length,land type and so on,the average intensity index and diversity index of the all coastal cities were different distinctly.
基金funded by the National Key Research and Development Program of China(Grant No.2016YFA0601302)the Natural Science Foundation of China(Grant No.41876146,No.41476116)the China-EU Cooperation Project:Ecological farming research in coastal zone composite system(INCO-CT-2004-510706).
文摘The samples collected from the surface sediments in Xiangshan Bay,Zhejiang province in May and November 2005 were analyzed under a light microscope.The species composition,abundance,community structure and diversity were investigated.A total of 179 taxa belonging to 46 genera of diatom were identified.The result showed that the ecotypes of diatom were mostly eurytopic species,followed by warm water species and temperate species.The most dominant species were Cyclotella stylorum and Coscinodiscus jonesianus.The seasonal variation of diatom abundance was remarkable.The cell abundance of diatoms was higher in spring(2.974×10^3 cells/g)than that in autumn(0.071×10^3 cells/g).The number of species varies with change of season,demonstrating the adaptability of diatoms to the temperature of water.The species diversity of benthic diatom was lower in autumn than that in spring.