On the basis of seasonal investigations at 23°30′ - 33°00′N, 118°30′ - 128°00′E of the East China Sea during 1997 -2000, dynamics on the density and diversity of Ostracoda was discussed. Result...On the basis of seasonal investigations at 23°30′ - 33°00′N, 118°30′ - 128°00′E of the East China Sea during 1997 -2000, dynamics on the density and diversity of Ostracoda was discussed. Results showed that totally 26 species were identified. The Ostracoda diversity was opposite to the change of its density in most seasons which reflected an uneven assignment of Ostracoda density among its different species. The Ostracoda density was 0. 70 ind./m^3 in spring, 1.72 ind./m^3 in summer, 2.57 ind./m^3 in autumn and 0. 90 ind./m^3 in winter. Euconchoecia chierchiae in spring and winter, Euconchoecia maimai in summer and Cypridina dentata in autumn were main dominant species in each season. The Ostraeoda density did not show an obvious linear relationship with the hydrologic factors in summer and autumn, but was related to the surface salinity in spring and the surface temperature in winter. Its high density areas mainly distributed in the north offshore in all the seasons while in the south offshore in winter and in spring, and the south nearshore in summer and autumn, implied the zooplankton was a typical warm water animal, whose high density distribution in autumn were located in a similar position to Todarodes pacificus, Navodon Septentrionalis, Scomberjaponicus and other fishes in the sea, so as to be an important indicator for fishing ground. The main species dominating in Ostracoda now are different from the species twenty years ago probably attributes to global warming.展开更多
Nucleotide sequences from 18S rDNA of 11 ostracodes, which represent four suborders and six superfamilies of podocopidan, were determined. The phylogenetic relationships were analyzed based on three kinds of methods (...Nucleotide sequences from 18S rDNA of 11 ostracodes, which represent four suborders and six superfamilies of podocopidan, were determined. The phylogenetic relationships were analyzed based on three kinds of methods (maximum-likelihood, maximum-parsimony, and neighbor-joining), and the three topologies gained were basically similar. The results have showed that (1) a monophyletic Podocopida was supported strongly; (2) the phylogenetic relationships of four suborders were (Darwinulocopina plus (Bairdiocopina plus (Cytherocopina plus Cypridocopina))), which indicated that a close relationship between Cytherocopina and Cypridocopina, and Darwinulocopina had separated early from the main podocopinan; (3) Cypridocopinan formed a monophyletic group, among which the phylogenetic relationship of three superfamilies was (Cypridoidea plus (Macrocypridoidea plus Pontocypridoidea)).展开更多
Planktonic ostracods are small crustaceans abundant in marine ecosystem worldwide as appreciable part of marine zooplankton. Family Halocyprididae is a large group of halocyprid ostracods, and the tribe Conchoeciini h...Planktonic ostracods are small crustaceans abundant in marine ecosystem worldwide as appreciable part of marine zooplankton. Family Halocyprididae is a large group of halocyprid ostracods, and the tribe Conchoeciini has contained 21 genera previously. We described a further genus with a species Polyconchoecia commixtus gen. et sp. nov. from the middle of South China Sea in this study. The new species can be distinguished from related genera and species in having a unique combination of these characteristics： a lateral gland placed over right asymmetric gland and open near posterior margin; dense edge glands placed along ventral margin of carapace in line; shape of frontal organ; e-seta of first antenna is bare; endopod of second antenna has one small oval hump with central concave on mid-ventral margin, instead of processus mamillaris, exopod 1 has a small disto-dorsal spine, exopod 1 and 2 are fused, exopod 3 and 4 are bare; endopod 1 of mandible has one long ventral seta, endopod 2 has one ventral seta; maxillary endopod 1 has two basal setae; endopod 1 of fifth limb has only one ventral seta; endopod 1 of sixth limb and endopod 2 have no ventral seta. The definite distinctions in locations of major glands are the key characteristics of the new genus.展开更多
This paper discusses the quantitative variation, ecological groups, community characteristics, vertical distribution and the composition of Ostracoda in different water layers, with the emphasis on the analysis ofrela...This paper discusses the quantitative variation, ecological groups, community characteristics, vertical distribution and the composition of Ostracoda in different water layers, with the emphasis on the analysis ofrelation between Ostracoda and water masses, and the impacts from hypersaline upwelling and local density circulations on this group of animal.展开更多
In the analysis of samples of planktonic Ostracoda from the northeast of the East China ho and in the cooperative study on the Kureshio Of China and Japan,we discovered a new spotes belonging to Paraconchoecia.This sp...In the analysis of samples of planktonic Ostracoda from the northeast of the East China ho and in the cooperative study on the Kureshio Of China and Japan,we discovered a new spotes belonging to Paraconchoecia.This specimen being different from other seven species of the 'Procera' group in the genus in its having dorsal spines on both shells and other features, is named Paraconchoecia diacanthus n. sp.展开更多
This report is based on the monthly data obtained during the annual comprehensive survey in a widearea between 28°-34°N, 120°30'-127°E from December 1977 to November 1978. The species diversity...This report is based on the monthly data obtained during the annual comprehensive survey in a widearea between 28°-34°N, 120°30'-127°E from December 1977 to November 1978. The species diversity, quantitative distribution and seasonal patterns of Ostracoda and its relationship to the Taiwan Warm Current, KuroshioWarm Current, Huanghai Sea cold water mass, Huanghai sea Warm Current, Changeing River runoff and coastalcurrents are discussed.展开更多
Halocyprid ostracods are appreciable part of ostracods floating through virtually everywhere in marine environment.In this study,we describe a new species of genus Polyconchoecia Xiang,Chen and Du,2018,tribe Conchoeci...Halocyprid ostracods are appreciable part of ostracods floating through virtually everywhere in marine environment.In this study,we describe a new species of genus Polyconchoecia Xiang,Chen and Du,2018,tribe Conchoeciini Chavtur and Angel,2011,family Halocyprididae Dana,1853 from the middle of the South China Sea.Polyconchoecia chenii sp.nov.is very close to P.commixtus Xiang,Chen and Du,2018.But it differs from P.commixtus by the distinctions of locations of major glands of carapace and the characteristics of appendages:more posteriorly situated left asymmetric gland of carapace,no right asymmetric gland;segmented frontal organ;the endopod 2 of the first antenna with a very small seta;a-and c-setae of the first antenna with long end joint have long end joint,the b-and d-setae have no end joint,spinose e-seta without end joint;the e-seta of the second antenna is present;teeth side is distinctive;the setal counts of the mandible,maxilla,fifth limb,and sixth limb are individual.The locations of the major glands on carapace and the characteristics of the first antenna can be the key of the new species.This work is the second discovery of the genus Polyconchoecia from the world.展开更多
-This paper deals with the recent ostracods and their distribution in littora! zones. The ostracods studied in this paper are all from the coastal zones of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi...-This paper deals with the recent ostracods and their distribution in littora! zones. The ostracods studied in this paper are all from the coastal zones of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi. The present study shows that the richness and diversity of the ostracods from Gaode area are rather lower as compared with those from Weizhou Island, where individual numbers increase constantly from supralittoral to sublittoral zones. The ostracod associations of Weizhou Island are similar to those reported from the east coast of the Weizhou Island, and most of them are littoral and benthic forms of the order Podocopida and only a few of them are members of the order Myodocopoda (e. g. Ruti-derma, Cylindroleberis and Polycope). In this paper, the distributive character of the ostracods in the studied areas is analysed and discussed synthetically on the ground of their ecology, which will provide new information for the study of ecologic habitats, biogeographic provinciality and the Cenozoic biostratigraphy of ostracods.展开更多
the holocene ostracode are analyzed from the core sample ng93-1 collectedIn the great wall bay, antarctica during 1992～1993. Totally 11 genera 21 speciesHave been identified in the sediments, of which the most abunda...the holocene ostracode are analyzed from the core sample ng93-1 collectedIn the great wall bay, antarctica during 1992～1993. Totally 11 genera 21 speciesHave been identified in the sediments, of which the most abundant is loxoreticulatumFallax, the second abundant are xestoleberis keguelenensis, xestoleberis spp., Semicytherura spp., australicythere polylyca, etc. Most species of ostracodes are thoseKnown in antarctic area. Base on the study of ostracodes from the core ng93-1, theirSedimentary environment may be of shore-shallow sea.展开更多
The distribution of ostracods and benthonic foraminifers in the China sea area is briefly reviewed from the paleobio-geographic viewpoint in this paper. Three regions can be distinguished in the area on the basis of m...The distribution of ostracods and benthonic foraminifers in the China sea area is briefly reviewed from the paleobio-geographic viewpoint in this paper. Three regions can be distinguished in the area on the basis of modern distribution data: Region I (the Huanghai Sea and the Bohai Sea) with cool and temperate forms, Region I (the East China Sea and the northern part of the South China Sea) with subtropical warm-water forms and Region Ⅲ (central and southern parts of the South China Sea) with larger foraminifers and other tropical warm-water forms. The occurrence of Nummulites-Discocyclira fauna in the Eocene deposits of the East China Sea indicates a northward extension of tropical zoogeographical region at the time, whereas the distribution pattern of the Miocene Nephrolepidina-Miogypsiua-Austrotrillina fauna in the South China Sea resembles that of the present larger-foraminiferal fauna. In the South China Sea and Taiwan, a warm-water fauna with Asterorotalia and Pseudorotalia first appeared in late Miocene and then flourished in the Pliocene. Its northward invasion into the Bohai Sea area during late Pleistocene may be related to changes in current system. Many of the endemic foraminiferal and ostracod genera and species ( Sinocytheridea etc. ) in recent coastal faunas probably have originated from the South China Sea, and their occurrence in Japan or Australia may be indicative of ties between these areas during glacial times.展开更多
In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, Stat...In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, State Oceanic Administration, from May, 1984 to February, 1985. The data concerned were taken from the quantitative samples obtained by using large-sized standard zooplankton nets, while the values adopted such as hydrological and chemical data of the various stations were from the average values of the field data of each one-meter layer.展开更多
Living ostracod and hydrochemical samples were collected synchronously from more than 50 lakes and small water body in the eastern edge area of the Tibetan Plateau, Northern Tibetan, Southern Tibet and mid-Tibet. The ...Living ostracod and hydrochemical samples were collected synchronously from more than 50 lakes and small water body in the eastern edge area of the Tibetan Plateau, Northern Tibetan, Southern Tibet and mid-Tibet. The comparison of the adult body length of Limnocythere inopinata and hydrochemical parameters of their habitats shows that a quantitative relationship exists between the adult body length and salinity expressed as conductivity. An empirical formula to reconstruct paleosalinity is suggested first and applied to salinity reconstruction of CE-2 core from Cuoe Lake, Tibet. The method is verified by comparing its outcome with results of other environment reconstruction methods.展开更多
The Oligocene ostracod fauna of IISDP Site 292 of the western Philippine Sea was marked by high density, diversity and origination, probably reflecting a favorable period for deep-sea Ostraroda; while the sharp decrea...The Oligocene ostracod fauna of IISDP Site 292 of the western Philippine Sea was marked by high density, diversity and origination, probably reflecting a favorable period for deep-sea Ostraroda; while the sharp decrease in dtmsity and diversity as well as the repeatedly occurring vxtinctions in thc. Neogene may indicate the deterioration in bottom-water environmcnts at that tlme. Five rriajor faunal changes have been recognized in terms of density, diversity and evolutionary artivity (origination and extinction), occurring in the earliest Oligocene (PI8), mid-Oligocene (P21), earliest Miocene (N4), early Middle Miocene (N8) and late Pliocene (N21). respectively. These changes in ostracod faunas are suggested to represent short-term events related to global paleoceanographical changes and to record the Cainozoic cooling history of the West Pacific Ocean and Philippine Sea deep-water.展开更多
基金This study was funded by the Major Research Plan of the National Natural Science Foundation of China under contract No.90511005.
文摘On the basis of seasonal investigations at 23°30′ - 33°00′N, 118°30′ - 128°00′E of the East China Sea during 1997 -2000, dynamics on the density and diversity of Ostracoda was discussed. Results showed that totally 26 species were identified. The Ostracoda diversity was opposite to the change of its density in most seasons which reflected an uneven assignment of Ostracoda density among its different species. The Ostracoda density was 0. 70 ind./m^3 in spring, 1.72 ind./m^3 in summer, 2.57 ind./m^3 in autumn and 0. 90 ind./m^3 in winter. Euconchoecia chierchiae in spring and winter, Euconchoecia maimai in summer and Cypridina dentata in autumn were main dominant species in each season. The Ostraeoda density did not show an obvious linear relationship with the hydrologic factors in summer and autumn, but was related to the surface salinity in spring and the surface temperature in winter. Its high density areas mainly distributed in the north offshore in all the seasons while in the south offshore in winter and in spring, and the south nearshore in summer and autumn, implied the zooplankton was a typical warm water animal, whose high density distribution in autumn were located in a similar position to Todarodes pacificus, Navodon Septentrionalis, Scomberjaponicus and other fishes in the sea, so as to be an important indicator for fishing ground. The main species dominating in Ostracoda now are different from the species twenty years ago probably attributes to global warming.
基金supported by the Major Project of the National Natural Science Foundation of China under contract No.30130040the Cultivation Fund of the Key Scientific and Technical hmovation Project,Ministry of Education of China under contract No.704023+2 种基金E-institute of Shanghai Municipal Education Commission under contract No.E03009the Program of Shanghai Subject Chief Scientist under contract No.05XD14005 to Chen Liqiaothe PhD Program Scholarship Fund of ECNU 2005.
文摘Nucleotide sequences from 18S rDNA of 11 ostracodes, which represent four suborders and six superfamilies of podocopidan, were determined. The phylogenetic relationships were analyzed based on three kinds of methods (maximum-likelihood, maximum-parsimony, and neighbor-joining), and the three topologies gained were basically similar. The results have showed that (1) a monophyletic Podocopida was supported strongly; (2) the phylogenetic relationships of four suborders were (Darwinulocopina plus (Bairdiocopina plus (Cytherocopina plus Cypridocopina))), which indicated that a close relationship between Cytherocopina and Cypridocopina, and Darwinulocopina had separated early from the main podocopinan; (3) Cypridocopinan formed a monophyletic group, among which the phylogenetic relationship of three superfamilies was (Cypridoidea plus (Macrocypridoidea plus Pontocypridoidea)).
基金The National Natural Science Foundation of China under contract Nos 41406188,41406216 and 41506217the Grant of China Ministry of Science and Technology under contract No.2013BAD13B06+3 种基金the Grant of Guangdong Province Ministry of Science and Technology under contract No.2014A020217011the Ministry of Agriculture Major Funding Projects under contract No.NFZX2013the Global Climate Change and Ocean Atmosphere Interaction Research under contract No.GASI-01-02-04the Project Sponsored by the Scientific Research Foundation of Third Institute of Oceanography,SOA under contract No.2017009
文摘Planktonic ostracods are small crustaceans abundant in marine ecosystem worldwide as appreciable part of marine zooplankton. Family Halocyprididae is a large group of halocyprid ostracods, and the tribe Conchoeciini has contained 21 genera previously. We described a further genus with a species Polyconchoecia commixtus gen. et sp. nov. from the middle of South China Sea in this study. The new species can be distinguished from related genera and species in having a unique combination of these characteristics： a lateral gland placed over right asymmetric gland and open near posterior margin; dense edge glands placed along ventral margin of carapace in line; shape of frontal organ; e-seta of first antenna is bare; endopod of second antenna has one small oval hump with central concave on mid-ventral margin, instead of processus mamillaris, exopod 1 has a small disto-dorsal spine, exopod 1 and 2 are fused, exopod 3 and 4 are bare; endopod 1 of mandible has one long ventral seta, endopod 2 has one ventral seta; maxillary endopod 1 has two basal setae; endopod 1 of fifth limb has only one ventral seta; endopod 1 of sixth limb and endopod 2 have no ventral seta. The definite distinctions in locations of major glands are the key characteristics of the new genus.
文摘This paper discusses the quantitative variation, ecological groups, community characteristics, vertical distribution and the composition of Ostracoda in different water layers, with the emphasis on the analysis ofrelation between Ostracoda and water masses, and the impacts from hypersaline upwelling and local density circulations on this group of animal.
文摘In the analysis of samples of planktonic Ostracoda from the northeast of the East China ho and in the cooperative study on the Kureshio Of China and Japan,we discovered a new spotes belonging to Paraconchoecia.This specimen being different from other seven species of the 'Procera' group in the genus in its having dorsal spines on both shells and other features, is named Paraconchoecia diacanthus n. sp.
文摘This report is based on the monthly data obtained during the annual comprehensive survey in a widearea between 28°-34°N, 120°30'-127°E from December 1977 to November 1978. The species diversity, quantitative distribution and seasonal patterns of Ostracoda and its relationship to the Taiwan Warm Current, KuroshioWarm Current, Huanghai Sea cold water mass, Huanghai sea Warm Current, Changeing River runoff and coastalcurrents are discussed.
基金The Global Climate Change and Ocean Atmosphere Interaction Research under contract No.GASI-01-02-04the National Natural Science Foundation of China under contract Nos 41406216 and 41506217+1 种基金the project sponsored by the Scientific Research Foundation of Third Institute of Oceanography,MNR under contract No.2017009the National Special Project on Gas Hydrate of China under contract No.DD20190218
文摘Halocyprid ostracods are appreciable part of ostracods floating through virtually everywhere in marine environment.In this study,we describe a new species of genus Polyconchoecia Xiang,Chen and Du,2018,tribe Conchoeciini Chavtur and Angel,2011,family Halocyprididae Dana,1853 from the middle of the South China Sea.Polyconchoecia chenii sp.nov.is very close to P.commixtus Xiang,Chen and Du,2018.But it differs from P.commixtus by the distinctions of locations of major glands of carapace and the characteristics of appendages:more posteriorly situated left asymmetric gland of carapace,no right asymmetric gland;segmented frontal organ;the endopod 2 of the first antenna with a very small seta;a-and c-setae of the first antenna with long end joint have long end joint,the b-and d-setae have no end joint,spinose e-seta without end joint;the e-seta of the second antenna is present;teeth side is distinctive;the setal counts of the mandible,maxilla,fifth limb,and sixth limb are individual.The locations of the major glands on carapace and the characteristics of the first antenna can be the key of the new species.This work is the second discovery of the genus Polyconchoecia from the world.
文摘-This paper deals with the recent ostracods and their distribution in littora! zones. The ostracods studied in this paper are all from the coastal zones of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi. The present study shows that the richness and diversity of the ostracods from Gaode area are rather lower as compared with those from Weizhou Island, where individual numbers increase constantly from supralittoral to sublittoral zones. The ostracod associations of Weizhou Island are similar to those reported from the east coast of the Weizhou Island, and most of them are littoral and benthic forms of the order Podocopida and only a few of them are members of the order Myodocopoda (e. g. Ruti-derma, Cylindroleberis and Polycope). In this paper, the distributive character of the ostracods in the studied areas is analysed and discussed synthetically on the ground of their ecology, which will provide new information for the study of ecologic habitats, biogeographic provinciality and the Cenozoic biostratigraphy of ostracods.
文摘the holocene ostracode are analyzed from the core sample ng93-1 collectedIn the great wall bay, antarctica during 1992～1993. Totally 11 genera 21 speciesHave been identified in the sediments, of which the most abundant is loxoreticulatumFallax, the second abundant are xestoleberis keguelenensis, xestoleberis spp., Semicytherura spp., australicythere polylyca, etc. Most species of ostracodes are thoseKnown in antarctic area. Base on the study of ostracodes from the core ng93-1, theirSedimentary environment may be of shore-shallow sea.
基金Project supported by the Foundation of the Chinese National Commission for Education
文摘The distribution of ostracods and benthonic foraminifers in the China sea area is briefly reviewed from the paleobio-geographic viewpoint in this paper. Three regions can be distinguished in the area on the basis of modern distribution data: Region I (the Huanghai Sea and the Bohai Sea) with cool and temperate forms, Region I (the East China Sea and the northern part of the South China Sea) with subtropical warm-water forms and Region Ⅲ (central and southern parts of the South China Sea) with larger foraminifers and other tropical warm-water forms. The occurrence of Nummulites-Discocyclira fauna in the Eocene deposits of the East China Sea indicates a northward extension of tropical zoogeographical region at the time, whereas the distribution pattern of the Miocene Nephrolepidina-Miogypsiua-Austrotrillina fauna in the South China Sea resembles that of the present larger-foraminiferal fauna. In the South China Sea and Taiwan, a warm-water fauna with Asterorotalia and Pseudorotalia first appeared in late Miocene and then flourished in the Pliocene. Its northward invasion into the Bohai Sea area during late Pleistocene may be related to changes in current system. Many of the endemic foraminiferal and ostracod genera and species ( Sinocytheridea etc. ) in recent coastal faunas probably have originated from the South China Sea, and their occurrence in Japan or Australia may be indicative of ties between these areas during glacial times.
文摘In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, State Oceanic Administration, from May, 1984 to February, 1985. The data concerned were taken from the quantitative samples obtained by using large-sized standard zooplankton nets, while the values adopted such as hydrological and chemical data of the various stations were from the average values of the field data of each one-meter layer.
基金the National Key Basic Research Developmenr Project (Grant No. G1998040800) and the National Natural Science Foundation of China (Grant No. 49972058).
文摘Living ostracod and hydrochemical samples were collected synchronously from more than 50 lakes and small water body in the eastern edge area of the Tibetan Plateau, Northern Tibetan, Southern Tibet and mid-Tibet. The comparison of the adult body length of Limnocythere inopinata and hydrochemical parameters of their habitats shows that a quantitative relationship exists between the adult body length and salinity expressed as conductivity. An empirical formula to reconstruct paleosalinity is suggested first and applied to salinity reconstruction of CE-2 core from Cuoe Lake, Tibet. The method is verified by comparing its outcome with results of other environment reconstruction methods.
文摘The Oligocene ostracod fauna of IISDP Site 292 of the western Philippine Sea was marked by high density, diversity and origination, probably reflecting a favorable period for deep-sea Ostraroda; while the sharp decrease in dtmsity and diversity as well as the repeatedly occurring vxtinctions in thc. Neogene may indicate the deterioration in bottom-water environmcnts at that tlme. Five rriajor faunal changes have been recognized in terms of density, diversity and evolutionary artivity (origination and extinction), occurring in the earliest Oligocene (PI8), mid-Oligocene (P21), earliest Miocene (N4), early Middle Miocene (N8) and late Pliocene (N21). respectively. These changes in ostracod faunas are suggested to represent short-term events related to global paleoceanographical changes and to record the Cainozoic cooling history of the West Pacific Ocean and Philippine Sea deep-water.
