The annual frequency of red tides from 1977 to 2012 and the monthly frequency of red tides from 2001 to 2012 in China seas were used to establish the time series of red tide annual frequency and monthly frequency, res...The annual frequency of red tides from 1977 to 2012 and the monthly frequency of red tides from 2001 to 2012 in China seas were used to establish the time series of red tide annual frequency and monthly frequency, respectively. The annual frequency fit well with time segments revealed by piecewise linear regression analysis. The seasonal maximum of monthly frequency was in May (-18.22), and the stochastic volatility tended to increase gradually with time series, with peak values occurring from May to July. Holt exponential smoothing and Holt-winter exponential smoothing were used to predict red tide annual and monthly frequencies, which revealed that the annual frequency of red tides would rise slowly by one time from 2013 to 2020, and that red tides would mainly occur from May to July in 2013-2016 with a peak value of about 25 times in May.展开更多
In this paper, ECOMSED (Estuarine Coastal Ocean Model with sediment transport) model is employed to simulate storm surge process caused by typhoon passing across East China Sea in nearly years. Capability of ECOMSED...In this paper, ECOMSED (Estuarine Coastal Ocean Model with sediment transport) model is employed to simulate storm surge process caused by typhoon passing across East China Sea in nearly years. Capability of ECOMSED to simulate storm surge is validated by comparing model result with observed data. Sensitivity experiments are designed to study the influence of sea level rise on typhoon storm surge. Numerical experiment shows that influence of mean sea level rise on typhoon storm surge is non-uniform spatially and changes as typhoon process differs. Maybe fixed boundary method would weaken the influence of mean sea level rise on storm surge, and free boundary method is suggested for the succeeding study.展开更多
Megaselia wuzhiensis, sp. nov., from Mt. Wuzhi, Hainan Province is described. It is similar to M. atricornis Beyer, but differs in Costal Ratios and hypopygium.
With the economic development, the problems of energy shortage become increasingly severe. As offshore wind energy has advantages, namely it is clean, renewable, not accounting for land area, without noise pollution, ...With the economic development, the problems of energy shortage become increasingly severe. As offshore wind energy has advantages, namely it is clean, renewable, not accounting for land area, without noise pollution, with large reserves, etc., which gradually attracts people's attention. In this paper, China's offshore annual average wind field and monthly average wind field under the mean climate state conditions are obtained, and the corresponding wind density distribution is calculated. China's offshore wind energy reserves and distribution conditions through the analysis of wind energy density distribution are summarized, and finally some suggestions for coastal offshore wind energy development and utilization in China are put forward.展开更多
Vegetation evolution in the northern South China Sea region since 40 500 a BP is reconstructed using biomization procedure based on pollen data from deep sea core 17940. The result shows that, it is feasible to recons...Vegetation evolution in the northern South China Sea region since 40 500 a BP is reconstructed using biomization procedure based on pollen data from deep sea core 17940. The result shows that, it is feasible to reconstruct palaeovegetation using biomization procedure, when pollen, particularly Pinus pollen, transported by mind over long distance is excluded. Results from factor analysis suggest that humidity and temperature are the two main factors determining vegetation evolution on land around the northern South China Sea. From 40 500 a BP to 11 100 a BP, broad-leaved evergreen forest (WAMF), and montane conifers(MGRF) occurred on hills and low mountains; while steppe (STEP) predominated on the exposed shelf. The main feature of the vegetation evolution is the frequent alternation between MGRF (or WAMF) and STEP, implying abrupt changes in millennium scale between humid/cold and dry/temperate climate. All abrupt climate events could be broadly correlated with Henrich events and Dansggard-Oscherge events. One of the events around 12 700 a BP, sees the occurrence of MGRF, suggesting that climate turned humid and cold rapidly. This may be correlated with the Younger Dryas event; Broad-leaved evergreen (WAMF) predominates since 11 000 a BP. During the early Holocene and late Holocene tropical rainforest (TRFO) or tropical seasonal forest (TSFO) occurred several times.展开更多
JCOMM has strategy to establish the network of WMO-IOC Centres for Marine-meteorological and Oceanographic Climate Data (CMOCs) under the new Marine Climate Data System (MCDS) in 2012 for improving the quality and...JCOMM has strategy to establish the network of WMO-IOC Centres for Marine-meteorological and Oceanographic Climate Data (CMOCs) under the new Marine Climate Data System (MCDS) in 2012 for improving the quality and timeliness of the marine-meteorological and oceanographic data, metadata and products available to end users. China as a candidate of CMOC China has been approved to run on a trial basis after the 4th Meeting of the Joint IOC/WMO Technical Commission for Oceanography and Marine Meteorology (JCOMM). This article states the developing intention of CMOC China in the next few years through the brief introduction to critical marine data, products and service system and cooperation projects in the world.展开更多
[Objective] This study aimed to select suitable cultivars of cut roses with prominent comprehensive performance which is suitable for the commercial promotion in the tropical region of South Hainan Province,including ...[Objective] This study aimed to select suitable cultivars of cut roses with prominent comprehensive performance which is suitable for the commercial promotion in the tropical region of South Hainan Province,including Sanya and the low-altitude area.[Method] Introduction experiment and production test were designed to observe the agronomic and economic traits of cultivars in a rose resources nursery established in Sanya.[Result] Through observation in the resources garden,18 varieties were chosen to conduct the introduction experiment,of which 8 varieties were selected to accomplish the production test.The results of the production test showed that 'Vendela','Golden Emblem','Samantha' and 'Tineke' showed the best adaptability;the cut flower quality of 'Carola','Black Magic' and 'Golden Emblem' belonged to the first grade;the yield of 'Movie Star','Golden Emblem' and 'Black Magic' was more than one million per hm2;except 'Golden Emblem',the vase life of the other seven cultivars was more than 10 days;'Carola','My Choice' and 'Perfume White' had better disease-and insect-resistance;'Carola','Vendela','Rouge Meilland','Tineke','Golden Emblem','Samantha','Perfume White','Saiun','Asagumo' and 'Double Delight' were more resistant to blackspot,while 'Black Magic','Versilla','Alec's Red' and 'Movie Star' were less resistant to blackspot.[Conclusion] Cultivars of cut roses were able to grow and develop normally in the tropical coastal area of Hainan Province,including South Hainan and Sanya,where it was appropriate for the production of cut roses.However,it is necessary to pay attention to the prevention and control of thrips and blackspot.'Black Magic','Carola','Vendela','Rouge Meilland','Golden Emblem','Tineke','Movie Star' and 'Samantha' showed best comprehensive performance,which were thus worthy of large-scale popularization in Hainan Province.展开更多
The construction of Hainan International Tourism Island creates a promising prospect for the development of its tropical leisure agro-tourism, and the latter will contribute a lot to the former in the fields of econom...The construction of Hainan International Tourism Island creates a promising prospect for the development of its tropical leisure agro-tourism, and the latter will contribute a lot to the former in the fields of economy, ecology and culture. The present situation and development prospects of tropical leisure agro-tourism in the context of constructing International Tourism Island in Hainan are introduced in this study, SWOT analysis of tropical leisure agro-tourism in Hainan is conducted, causes of imperfect tropical leisure agro-tourism in Hainan Island are elaborated such as insufficient understanding and investment, fragile infrastructure and lack of overall tourism planning despite its abundant tropical agricultural resources, marine resources, forest resources and ecological resources as well as convenient transportation. Combining with the opportunities and challenges in developing tourism industry, targeted strategies are proposed for promoting the tropical leisure agro-tourism, that is, enhancing understanding about leisure agro-tourism; determining the target and orientation of tourism planning through basic classification, properly defining functional divisions and spatial layout; improving relevant laws and regulations about tourism industry; attaching more importance in attracting alien investment; fully developing the tropical, marine, green and ecological features of tropical leisure agro-tourism in Hainan Island; cultivating resources, scenic spots and products of different types respectively in tourism development, especially culturing typical products; protecting ecological environment, implementing sustainable development of tourism industry; making innovations in marketing, accurately subdividing tourism market.展开更多
Through in-depth analysis, this paper proposed development planning of leisure agriculture in Hainan. The layout included orderly development and overal planning, connection of three expressways and middle area for re...Through in-depth analysis, this paper proposed development planning of leisure agriculture in Hainan. The layout included orderly development and overal planning, connection of three expressways and middle area for recreation and the rest for sightseeing; the site selection should develop depending on central cities, relying on major projects and famous mountains or landscapes; the connotation in-volved exploitation of farming culture, presenting national customs of indigenous people, highlights given to island and coasts and emphasizing tropic agriculture. What's more, the suggestions were proposed to advance leisure agriculture of Hainan, including to formulate scientific planning to lead leisure agriculture develop-ment, to give policy supports and enterprise management, to improve promotion and broadening market and to enhance education and improve industry quality. On basis of lots of data and examples, the research enriched the content of leisure agricul-ture in Hainan, which is conductive to development of Hainan leisure agriculture, and of significance for construction of leisure agriculture sites and supports of the agriculture by government.展开更多
Digital Ocean Information Framework (DOIF) has been proposed by China in 2011 based on the achievements of the comprehensive offshore oceanic surveys supported by Chinese Offshore Investigation and Assessment Progra...Digital Ocean Information Framework (DOIF) has been proposed by China in 2011 based on the achievements of the comprehensive offshore oceanic surveys supported by Chinese Offshore Investigation and Assessment Program, whose code name is 908. All observations from the surveys have been integrated and managed by DOIF. DOIF is capable of supporting the decision of making process for the sustainable use of marine resources in coastal regions of China, providing useful information and added value products as well as services for the improved management of the coastal areas in China with high business impact on the targeted groups as public authorities and commercial operators (e.g. managers, fishermen, shipping companies). The future vision of DOIF in the international marine data and information exchange and service at Western Pacific region is presented in this paper.展开更多
A wild population of the globally restricted and highly threatened freshwater fish Tanichthys albonubes Lin was recently discovered on Hainan Island, China. Prior to the present study, native populations were only kno...A wild population of the globally restricted and highly threatened freshwater fish Tanichthys albonubes Lin was recently discovered on Hainan Island, China. Prior to the present study, native populations were only known from isolated pockets in Guangdong Province of China and Quang Ninh Province of Vietnam; the Hainan record thus represents the first insular and southernmost distribution of this little-known species. Thus far it is known only from a single site in Hainan, despite repeated surveys of similar habitats throughout the island. The Hainan population occurs in a clean, sluggish coastal stream with abundant hydrophytes, and is sympatric with 20 fish species. Due to the unique geographic distribution of the Hainan population, and the conservation significance of the species, studies of its phylogenetic relationships with conspecifics populations elsewhere are underway. The exact locality of the newly discovered Hainan population cannot be revealed, but relevant government authorities have been notified and we are working to protect the site.展开更多
Using long term observation data in the main part of East China Sea Kuroshio, variations of Kuroshio upper layer temperature and salinity, their relationships with surface temperature and precipitation in east China a...Using long term observation data in the main part of East China Sea Kuroshio, variations of Kuroshio upper layer temperature and salinity, their relationships with surface temperature and precipitation in east China are studied. Results reveal that the Kuroshio upper layer temperature experienced slight rise while salinity decreased in the past 50 years. In winter, Kuroshio upper layer temperature is closely related to the surface temperature in east China, and large area in east China shows positive correlation to the Kuroshio upper layer temperature, which might be related to the mass temperature reduction as a result of the cold air activities in winter. In summer, the increase of the precipitation causes the increase of diluted Yangtze River water into the shelf sea, thereby results in the salinity decrease of Kuroshio in the upper layer.展开更多
The monthly mean suspended sediment concentration in the upper layer of the East China Seas was derived from the retrieval of the monthly binned SeaWiFS Level 3 data during 1998 to 2006. The seasonal variation and spa...The monthly mean suspended sediment concentration in the upper layer of the East China Seas was derived from the retrieval of the monthly binned SeaWiFS Level 3 data during 1998 to 2006. The seasonal variation and spatial distribution of the suspended sediment concentration in the study area were investigated. It was found that the suspended sediment distribution presents apparent spatial characteristics and seasonal variations, which are mainly affected by the resuspension and transportation of the suspended sediment in the study area. The concentration of suspended sediment is high inshore and low offshore, and river mouths are generally high concentration areas. The suspended sediment covers a much wider area in winter than in summer, and for the same site the concentration is generally higher in winter. In the Yellow and East China Seas the suspended sediment spreads farther to the open sea in winter than in summer, and May and October are the transitional periods of the extension. Winds, waves, currents, thermocline, halocline, pycnocline as well as bottom sediment feature and distribution in the study area are important influencing factors for the distribution pattern. If the 10rag L^-1 contour line is taken as an indicator, it appears that the transportation of suspended sediment can hardly reach 124^o00'E in summer or 126^o00'E in winter, which is due to the obstruction of the Taiwan Warm Current and the Kuroshio Current in the southern Yellow Sea and the East China Sea.展开更多
Although chub mackerel (Scomberjaponicus) is a primary pelagic fish species, we have only limited knowledge on its key life history processes. The present work studied the age and growth of chub mackerel in the East...Although chub mackerel (Scomberjaponicus) is a primary pelagic fish species, we have only limited knowledge on its key life history processes. The present work studied the age and growth of chub mackerel in the East China and Yellow Seas. Age was determined by interpreting and counting growth rings on the sagitta otoliths of 252 adult fish caught by the Chinese commercial purse seine fleet during the period from November 2006 to January 2007 and 150 juveniles from bottom trawl surveys on the spawning ground in May 2006. The difference between the assumed birth date of 1st April and date of capture was used to adjust the age determined from counting the number of complete translucent rings. The parameters of three commonly used growth models, the von Bertalanffy, Logistic and Gompertz models, were estimated using the maximum likelihood method. Based on the Akaike Information Criterion (AIC), the yon Bertalanffy growth model was found to be the most appropriate model. The size-at-age and size-at-maturity values were also found to decrease greatly compared with the results achieved in the 1950s, which was caused by heavy exploitation over the last few decades.展开更多
POM was used to study the monthly mean circulation in the Yellow Sea and East China Sea. The calculated results showed almost all major characteristics of the circulation system. The calculated circulation system and ...POM was used to study the monthly mean circulation in the Yellow Sea and East China Sea. The calculated results showed almost all major characteristics of the circulation system. The calculated circulation system and observational data were used to determine the sediment concentration, volume transport, heat flux and suspended matter flux between the Yellow Sea and the East China Sea. The conclusions obtained were that the volume and heat are transported northward through the 32°N section during each season; that in winter and autumn, total suspended matter is transported southward, and is larger in winter than in autumn. The reason is that the Yellow Sea Coastal Current is strong and always contains more suspend matter in winter and autumn. The seasonal suspended matter exchange between the Yellow Sea and the East China Sea are 0.58×10 7 tons in spring, 2.81×10 7 tons in summer, -2.60×10 7 tons in autumn and -3.40×10 7 tons in winter. Net flux of suspended matter from the Yellow Sea to the East China Sea is 2.61×10 7 tons every year.展开更多
基金financially supported by the Tianjin Marine Science and Technology Project (KJXH2011-05)local colleges and universities in Shanghai liberal arts academic programme (B5201120003)
文摘The annual frequency of red tides from 1977 to 2012 and the monthly frequency of red tides from 2001 to 2012 in China seas were used to establish the time series of red tide annual frequency and monthly frequency, respectively. The annual frequency fit well with time segments revealed by piecewise linear regression analysis. The seasonal maximum of monthly frequency was in May (-18.22), and the stochastic volatility tended to increase gradually with time series, with peak values occurring from May to July. Holt exponential smoothing and Holt-winter exponential smoothing were used to predict red tide annual and monthly frequencies, which revealed that the annual frequency of red tides would rise slowly by one time from 2013 to 2020, and that red tides would mainly occur from May to July in 2013-2016 with a peak value of about 25 times in May.
文摘In this paper, ECOMSED (Estuarine Coastal Ocean Model with sediment transport) model is employed to simulate storm surge process caused by typhoon passing across East China Sea in nearly years. Capability of ECOMSED to simulate storm surge is validated by comparing model result with observed data. Sensitivity experiments are designed to study the influence of sea level rise on typhoon storm surge. Numerical experiment shows that influence of mean sea level rise on typhoon storm surge is non-uniform spatially and changes as typhoon process differs. Maybe fixed boundary method would weaken the influence of mean sea level rise on storm surge, and free boundary method is suggested for the succeeding study.
基金This project was supported by the National Natural Science Foundation of China (30270187)
文摘Megaselia wuzhiensis, sp. nov., from Mt. Wuzhi, Hainan Province is described. It is similar to M. atricornis Beyer, but differs in Costal Ratios and hypopygium.
文摘With the economic development, the problems of energy shortage become increasingly severe. As offshore wind energy has advantages, namely it is clean, renewable, not accounting for land area, without noise pollution, with large reserves, etc., which gradually attracts people's attention. In this paper, China's offshore annual average wind field and monthly average wind field under the mean climate state conditions are obtained, and the corresponding wind density distribution is calculated. China's offshore wind energy reserves and distribution conditions through the analysis of wind energy density distribution are summarized, and finally some suggestions for coastal offshore wind energy development and utilization in China are put forward.
文摘Vegetation evolution in the northern South China Sea region since 40 500 a BP is reconstructed using biomization procedure based on pollen data from deep sea core 17940. The result shows that, it is feasible to reconstruct palaeovegetation using biomization procedure, when pollen, particularly Pinus pollen, transported by mind over long distance is excluded. Results from factor analysis suggest that humidity and temperature are the two main factors determining vegetation evolution on land around the northern South China Sea. From 40 500 a BP to 11 100 a BP, broad-leaved evergreen forest (WAMF), and montane conifers(MGRF) occurred on hills and low mountains; while steppe (STEP) predominated on the exposed shelf. The main feature of the vegetation evolution is the frequent alternation between MGRF (or WAMF) and STEP, implying abrupt changes in millennium scale between humid/cold and dry/temperate climate. All abrupt climate events could be broadly correlated with Henrich events and Dansggard-Oscherge events. One of the events around 12 700 a BP, sees the occurrence of MGRF, suggesting that climate turned humid and cold rapidly. This may be correlated with the Younger Dryas event; Broad-leaved evergreen (WAMF) predominates since 11 000 a BP. During the early Holocene and late Holocene tropical rainforest (TRFO) or tropical seasonal forest (TSFO) occurred several times.
文摘JCOMM has strategy to establish the network of WMO-IOC Centres for Marine-meteorological and Oceanographic Climate Data (CMOCs) under the new Marine Climate Data System (MCDS) in 2012 for improving the quality and timeliness of the marine-meteorological and oceanographic data, metadata and products available to end users. China as a candidate of CMOC China has been approved to run on a trial basis after the 4th Meeting of the Joint IOC/WMO Technical Commission for Oceanography and Marine Meteorology (JCOMM). This article states the developing intention of CMOC China in the next few years through the brief introduction to critical marine data, products and service system and cooperation projects in the world.
基金Supported by the National Agricultural Sci-Tech Achievements Transformation Projects(2010GB2E200369)the National Spark Program Project(2011GA800004)~~
文摘[Objective] This study aimed to select suitable cultivars of cut roses with prominent comprehensive performance which is suitable for the commercial promotion in the tropical region of South Hainan Province,including Sanya and the low-altitude area.[Method] Introduction experiment and production test were designed to observe the agronomic and economic traits of cultivars in a rose resources nursery established in Sanya.[Result] Through observation in the resources garden,18 varieties were chosen to conduct the introduction experiment,of which 8 varieties were selected to accomplish the production test.The results of the production test showed that 'Vendela','Golden Emblem','Samantha' and 'Tineke' showed the best adaptability;the cut flower quality of 'Carola','Black Magic' and 'Golden Emblem' belonged to the first grade;the yield of 'Movie Star','Golden Emblem' and 'Black Magic' was more than one million per hm2;except 'Golden Emblem',the vase life of the other seven cultivars was more than 10 days;'Carola','My Choice' and 'Perfume White' had better disease-and insect-resistance;'Carola','Vendela','Rouge Meilland','Tineke','Golden Emblem','Samantha','Perfume White','Saiun','Asagumo' and 'Double Delight' were more resistant to blackspot,while 'Black Magic','Versilla','Alec's Red' and 'Movie Star' were less resistant to blackspot.[Conclusion] Cultivars of cut roses were able to grow and develop normally in the tropical coastal area of Hainan Province,including South Hainan and Sanya,where it was appropriate for the production of cut roses.However,it is necessary to pay attention to the prevention and control of thrips and blackspot.'Black Magic','Carola','Vendela','Rouge Meilland','Golden Emblem','Tineke','Movie Star' and 'Samantha' showed best comprehensive performance,which were thus worthy of large-scale popularization in Hainan Province.
基金Co-supported by National Soft Science Research Project"Forecasting the Influence of Constructing Hainan International Tourism Island on Its Tourism Natural Environment and Countermeasures Study"(2009GXS5D120)Hainan Provincial Natural Science Foundation Project"Influence of Constructing Hainan International Tourism Island on Its Tourism Natural Environment and Countermeasures"(70899)+1 种基金Hainan Provincial Philosophical and Social Science Planning Project"Study on the Relationship between Economic Growth and Ecological Environment"(HNSK08-03)Study Project of the Education Department of Hainan Province"Influence of Constructing Hainan International Tourism Island on Its Natural Tourism Environment"(Hjkj2009-02)~~
文摘The construction of Hainan International Tourism Island creates a promising prospect for the development of its tropical leisure agro-tourism, and the latter will contribute a lot to the former in the fields of economy, ecology and culture. The present situation and development prospects of tropical leisure agro-tourism in the context of constructing International Tourism Island in Hainan are introduced in this study, SWOT analysis of tropical leisure agro-tourism in Hainan is conducted, causes of imperfect tropical leisure agro-tourism in Hainan Island are elaborated such as insufficient understanding and investment, fragile infrastructure and lack of overall tourism planning despite its abundant tropical agricultural resources, marine resources, forest resources and ecological resources as well as convenient transportation. Combining with the opportunities and challenges in developing tourism industry, targeted strategies are proposed for promoting the tropical leisure agro-tourism, that is, enhancing understanding about leisure agro-tourism; determining the target and orientation of tourism planning through basic classification, properly defining functional divisions and spatial layout; improving relevant laws and regulations about tourism industry; attaching more importance in attracting alien investment; fully developing the tropical, marine, green and ecological features of tropical leisure agro-tourism in Hainan Island; cultivating resources, scenic spots and products of different types respectively in tourism development, especially culturing typical products; protecting ecological environment, implementing sustainable development of tourism industry; making innovations in marketing, accurately subdividing tourism market.
基金Supported by State Revenue for Agricultural Technology Promotion in Southern Subtropics(14RZNJ-19)State Revenue for Agricultural Reclamation and Technology PromotionBasic Science Research Project Funds of Central Public Welfare Scientific Research Institutes,Institute of Tropical Bioscience and Biotechnology,Chinese Academy of Tropical Agricultural Sciences(ITBB140602)~~
文摘Through in-depth analysis, this paper proposed development planning of leisure agriculture in Hainan. The layout included orderly development and overal planning, connection of three expressways and middle area for recreation and the rest for sightseeing; the site selection should develop depending on central cities, relying on major projects and famous mountains or landscapes; the connotation in-volved exploitation of farming culture, presenting national customs of indigenous people, highlights given to island and coasts and emphasizing tropic agriculture. What's more, the suggestions were proposed to advance leisure agriculture of Hainan, including to formulate scientific planning to lead leisure agriculture develop-ment, to give policy supports and enterprise management, to improve promotion and broadening market and to enhance education and improve industry quality. On basis of lots of data and examples, the research enriched the content of leisure agricul-ture in Hainan, which is conductive to development of Hainan leisure agriculture, and of significance for construction of leisure agriculture sites and supports of the agriculture by government.
文摘Digital Ocean Information Framework (DOIF) has been proposed by China in 2011 based on the achievements of the comprehensive offshore oceanic surveys supported by Chinese Offshore Investigation and Assessment Program, whose code name is 908. All observations from the surveys have been integrated and managed by DOIF. DOIF is capable of supporting the decision of making process for the sustainable use of marine resources in coastal regions of China, providing useful information and added value products as well as services for the improved management of the coastal areas in China with high business impact on the targeted groups as public authorities and commercial operators (e.g. managers, fishermen, shipping companies). The future vision of DOIF in the international marine data and information exchange and service at Western Pacific region is presented in this paper.
基金Hainan biodiversity conservation project of Hong Kong Kadoorie Farm & Botanic Garden~~
文摘A wild population of the globally restricted and highly threatened freshwater fish Tanichthys albonubes Lin was recently discovered on Hainan Island, China. Prior to the present study, native populations were only known from isolated pockets in Guangdong Province of China and Quang Ninh Province of Vietnam; the Hainan record thus represents the first insular and southernmost distribution of this little-known species. Thus far it is known only from a single site in Hainan, despite repeated surveys of similar habitats throughout the island. The Hainan population occurs in a clean, sluggish coastal stream with abundant hydrophytes, and is sympatric with 20 fish species. Due to the unique geographic distribution of the Hainan population, and the conservation significance of the species, studies of its phylogenetic relationships with conspecifics populations elsewhere are underway. The exact locality of the newly discovered Hainan population cannot be revealed, but relevant government authorities have been notified and we are working to protect the site.
基金supported by National Natural Science Foundation Project ‘Multi-core Structure of Antarctic Circumpolar Current and a Dynamic View of Its Spatial-temporal Variation’ (No. 40506011)The key project of the National Natural Science Foundation of China ‘Diagnostic Analysis and Numerical Simulation of the Inter-decadal Variations of East Asian Summer Monsoon and Summer Precipitation in East of China’ (No. 40331010)The key project of the Major Natural Fundamental Researches of Universities in Jiangsu Province ‘Research of development and prediction theory of Drought and Flood in the mid-lower reaches of Yangtze River’ (No. 05KJA17002)
文摘Using long term observation data in the main part of East China Sea Kuroshio, variations of Kuroshio upper layer temperature and salinity, their relationships with surface temperature and precipitation in east China are studied. Results reveal that the Kuroshio upper layer temperature experienced slight rise while salinity decreased in the past 50 years. In winter, Kuroshio upper layer temperature is closely related to the surface temperature in east China, and large area in east China shows positive correlation to the Kuroshio upper layer temperature, which might be related to the mass temperature reduction as a result of the cold air activities in winter. In summer, the increase of the precipitation causes the increase of diluted Yangtze River water into the shelf sea, thereby results in the salinity decrease of Kuroshio in the upper layer.
基金the National Key Basic Research Science Foundation (973 Project)‘Marine Physical Variations in Eastern Marginal Seas of China and Their Environmental Impacts’ (2005CB422303)the Program for New Century Excellent Talents in University (NCET-05-0592)
文摘The monthly mean suspended sediment concentration in the upper layer of the East China Seas was derived from the retrieval of the monthly binned SeaWiFS Level 3 data during 1998 to 2006. The seasonal variation and spatial distribution of the suspended sediment concentration in the study area were investigated. It was found that the suspended sediment distribution presents apparent spatial characteristics and seasonal variations, which are mainly affected by the resuspension and transportation of the suspended sediment in the study area. The concentration of suspended sediment is high inshore and low offshore, and river mouths are generally high concentration areas. The suspended sediment covers a much wider area in winter than in summer, and for the same site the concentration is generally higher in winter. In the Yellow and East China Seas the suspended sediment spreads farther to the open sea in winter than in summer, and May and October are the transitional periods of the extension. Winds, waves, currents, thermocline, halocline, pycnocline as well as bottom sediment feature and distribution in the study area are important influencing factors for the distribution pattern. If the 10rag L^-1 contour line is taken as an indicator, it appears that the transportation of suspended sediment can hardly reach 124^o00'E in summer or 126^o00'E in winter, which is due to the obstruction of the Taiwan Warm Current and the Kuroshio Current in the southern Yellow Sea and the East China Sea.
基金the Program for New Century Excellent Talents in University (NCET-06-0437)Shanghai Leading Academic Discipline Project (No T1101)
文摘Although chub mackerel (Scomberjaponicus) is a primary pelagic fish species, we have only limited knowledge on its key life history processes. The present work studied the age and growth of chub mackerel in the East China and Yellow Seas. Age was determined by interpreting and counting growth rings on the sagitta otoliths of 252 adult fish caught by the Chinese commercial purse seine fleet during the period from November 2006 to January 2007 and 150 juveniles from bottom trawl surveys on the spawning ground in May 2006. The difference between the assumed birth date of 1st April and date of capture was used to adjust the age determined from counting the number of complete translucent rings. The parameters of three commonly used growth models, the von Bertalanffy, Logistic and Gompertz models, were estimated using the maximum likelihood method. Based on the Akaike Information Criterion (AIC), the yon Bertalanffy growth model was found to be the most appropriate model. The size-at-age and size-at-maturity values were also found to decrease greatly compared with the results achieved in the 1950s, which was caused by heavy exploitation over the last few decades.
文摘POM was used to study the monthly mean circulation in the Yellow Sea and East China Sea. The calculated results showed almost all major characteristics of the circulation system. The calculated circulation system and observational data were used to determine the sediment concentration, volume transport, heat flux and suspended matter flux between the Yellow Sea and the East China Sea. The conclusions obtained were that the volume and heat are transported northward through the 32°N section during each season; that in winter and autumn, total suspended matter is transported southward, and is larger in winter than in autumn. The reason is that the Yellow Sea Coastal Current is strong and always contains more suspend matter in winter and autumn. The seasonal suspended matter exchange between the Yellow Sea and the East China Sea are 0.58×10 7 tons in spring, 2.81×10 7 tons in summer, -2.60×10 7 tons in autumn and -3.40×10 7 tons in winter. Net flux of suspended matter from the Yellow Sea to the East China Sea is 2.61×10 7 tons every year.