Spatial and temporal distribution of octylphenol （OP） and nonylphenol （NP） in Mai Po Marshes, a subtropical estuarine wetland in Hong Kong, were investigated. Surface water samples were collected every month from ...Spatial and temporal distribution of octylphenol （OP） and nonylphenol （NP） in Mai Po Marshes, a subtropical estuarine wetland in Hong Kong, were investigated. Surface water samples were collected every month from 11 sites during the period of September- December 2004. Concentrations of OP and NP ranged from 11.3 to 348 ng/L and from 29 to 2591 ng/L, respectively. The high levels of NP and OP were found in November and December than in September and October. The levels of OP and NP have no significant spatial differences except September. Total organic matter in the sediments appeared to be an important factor in controlling the fate of these compounds in the aquatic environment.展开更多
Background:China's coastal wetlands belong to some of the most threatened ecosystems worldwide.The loss and degradation of these wetlands seriously threaten waterbirds that depend on wetlands.Methods:The China Coa...Background:China's coastal wetlands belong to some of the most threatened ecosystems worldwide.The loss and degradation of these wetlands seriously threaten waterbirds that depend on wetlands.Methods:The China Coastal Waterbird Census was organized by volunteer birdwatchers in China's coastal region.Waterbirds were surveyed synchronously once every month at 14 sites,as well as irregularly at a further 18 sites,between September 2005 and December 2013.Results:A total of 75 species of waterbirds met the 1 % population level Ramsar listing criterion at least once at one site.The number of birds of the following species accounted for over 20 % of the total flyway populations at a single site:Mute Swan(Cygnus olor),Siberia Crane(Grus leucogeranus),Far Eastern Oystercatcher(Haematopus osculans),Bar-tailed Godwit(Limosa lapponica),Spotted Greenshank(Tringa guttifer),Great Knot(Calidris tenuirostris),Spoon-billed Sandpiper(Calidris pygmeus),Saunders' s Gull(Larus saundersi),Relict Gull(Larus relictus),Great Cormorant(Phalacrocorax carbo),Eurasian Spoonbill(Platalea leucorodia),Black-faced Spoonbill(Platalea minor) and Dalmatian Pelican(Pelecanus crispus).A total of 26 sites supported at least one species of which their number met the1 % criterion.Forty-two species met the 1 % criterion in the Yellow River Delta,Shandong;29 at the Cangzhou coast,Hebei and 26 species at the Lianyungang coast,Jiangsu.Conclusions:The results highlight the international importance of China's coastal wetlands for waterbirds.This study also demonstrates that participation of local birdwatchers in waterbird surveys results in data that are invaluable not only for understanding the current status of waterbirds in China's coastal regions but also for waterbird conservation and management.展开更多
This paper describes the fishery catch structure of Vembanad wetland system during August 2012 to July 2013. The estimates of fishery production indicated an annual landing of 4387.31 t, in which 480.98 t and 3906.33 ...This paper describes the fishery catch structure of Vembanad wetland system during August 2012 to July 2013. The estimates of fishery production indicated an annual landing of 4387.31 t, in which 480.98 t and 3906.33 t contributed by southern and northern zone of Vembanad respectively. Eighty species of finfishes, five species of penaeid shrimps, three species of palaemonid prawns and two species of crabs were identified from the study period. The catch per unit effort (CPUE) value was maximum for gill net (3.04 kg·h-1) followed by stake net (2.43 kg·h-1), Chinese dip net (2.01 kg·h-1), seines (1.2 kg·h-1), cast net (0.72 kg·h-1) and hook and line (0.34 kg·h-1). Biological integrity and fishery production of estuaries in the country are declining mainly due to various man induced activities. Thaneermukkom barrage, the salinity barrier, constructed across the Vembanad wetland system in 1976, transforming the water body into two distinct ecosystems, a fresh water zone on the south and a brackish water zone on the north, resulting in gross changes in physical, chemical and biological entity of the aquatic ecosystem. In the southern zone of Vembanad the marine fish species were less available with the closure of the barrage period. There are signs of decline of the Vembanad fishery resources, evident in the lesser number of species and decline of fishery production. This will lead to biodiversity loss, fish stock reduction and will ultimately affect the livelihood support of the traditional fishers to a large extent, besides affecting other ecological services. A better conservation measure must be implemented for maintaining the sustainable fishery resources in Vembanad.展开更多
East Kolkata Wetland (EKW) has been assigned the status of Ramsar Site because of its vastness as well as self purification capabilities which have been utilized by local people for the massive agricultural and aquacu...East Kolkata Wetland (EKW) has been assigned the status of Ramsar Site because of its vastness as well as self purification capabilities which have been utilized by local people for the massive agricultural and aquaculture production for more than one century. In this context, an attempt has been made in the present paper to evaluate the existing environmental health of four selected contrasting wetlands of this eco-zone of global importance by qualitative and quantitative hydro-biological studies. Two of the selected wetlands (study site-III and study site-IV) used to receive water from raw sewage after undergoing phytoremediation process. The study site-II has been selected with a view to evaluate the pollution stress on the structural components of this wetland ecosystem as it receives waste water because of anthropogenic activities, and the study site-I is away from any pollution impact as it is located in a well managed natural park. Quantification of the variabilities of different biotic components caused by water pollution has been assessed by recording binary distribution patterns of zooplankton and similarity indices. Besides, new Biotic Indices (Species Pollution Value—SPV and Community Pollution Value—CPV) have been developed using data on the distributional patterns of zooplankton in order to assess the degree of pollution of the studied wetlands. Seasonal water quality data along with qualitative and quantitative information of biological parameters have also been taken into consideration to highlight the impact of phytoremediation on wetland ecosystem dynamics on one hand and pollution stress on the structural and functional components of the water body on the other hand.展开更多
Introduction:The benefit of wetlands for reducing poverty depends on the effectiveness of governance systems that influence peoples’behaviour in the wise use of wetlands.Objectives:This article critically analyses th...Introduction:The benefit of wetlands for reducing poverty depends on the effectiveness of governance systems that influence peoples’behaviour in the wise use of wetlands.Objectives:This article critically analyses the current poverty reduction strategies,agrarian policies and economic investments governing wetland usage,especially in Tanzania,with regard to their impact on sustainable Ramsar wetlands management.Methodology:It analyses the management structure,domestic policies and legal framework relating to the protection of wetlands in Tanzania in accordance to the wise use concept of the Ramsar Convention.Outcomes:Tanzanian legal provisions for wetland protection are uncoordinated and too limited in their coverage and scope to sufficiently address the destruction of wetland ecosystems.There is no comprehensive national legal framework to guide sustainable management of Ramsar wetlands in Tanzania as laid out by the Ramsar Convention,which the country ratified in the year 2000.Conclusion:Without a sound legislative and policy-making framework,Tanzanian wetlands and their diverse ecosystem services will continue to degenerate with current strategies of increasing agribusiness and other developmental projects or economic investments.This paper provides critical baseline information to inform decision makers to develop appropriate policy and laws,which promote the wise use of wetlands in Tanzania.展开更多
基金Project supported by the Science Faculty Strategic Research of HongKong Baptist University(No.FRG/03-04/II-51)the Environment and Conservation Fund of Hong Kong Environmental Protection Department(No.16/2003)the National Natural Science Foundation of China(No.20307012).
文摘Spatial and temporal distribution of octylphenol （OP） and nonylphenol （NP） in Mai Po Marshes, a subtropical estuarine wetland in Hong Kong, were investigated. Surface water samples were collected every month from 11 sites during the period of September- December 2004. Concentrations of OP and NP ranged from 11.3 to 348 ng/L and from 29 to 2591 ng/L, respectively. The high levels of NP and OP were found in November and December than in September and October. The levels of OP and NP have no significant spatial differences except September. Total organic matter in the sediments appeared to be an important factor in controlling the fate of these compounds in the aquatic environment.
文摘Background:China's coastal wetlands belong to some of the most threatened ecosystems worldwide.The loss and degradation of these wetlands seriously threaten waterbirds that depend on wetlands.Methods:The China Coastal Waterbird Census was organized by volunteer birdwatchers in China's coastal region.Waterbirds were surveyed synchronously once every month at 14 sites,as well as irregularly at a further 18 sites,between September 2005 and December 2013.Results:A total of 75 species of waterbirds met the 1 % population level Ramsar listing criterion at least once at one site.The number of birds of the following species accounted for over 20 % of the total flyway populations at a single site:Mute Swan(Cygnus olor),Siberia Crane(Grus leucogeranus),Far Eastern Oystercatcher(Haematopus osculans),Bar-tailed Godwit(Limosa lapponica),Spotted Greenshank(Tringa guttifer),Great Knot(Calidris tenuirostris),Spoon-billed Sandpiper(Calidris pygmeus),Saunders' s Gull(Larus saundersi),Relict Gull(Larus relictus),Great Cormorant(Phalacrocorax carbo),Eurasian Spoonbill(Platalea leucorodia),Black-faced Spoonbill(Platalea minor) and Dalmatian Pelican(Pelecanus crispus).A total of 26 sites supported at least one species of which their number met the1 % criterion.Forty-two species met the 1 % criterion in the Yellow River Delta,Shandong;29 at the Cangzhou coast,Hebei and 26 species at the Lianyungang coast,Jiangsu.Conclusions:The results highlight the international importance of China's coastal wetlands for waterbirds.This study also demonstrates that participation of local birdwatchers in waterbird surveys results in data that are invaluable not only for understanding the current status of waterbirds in China's coastal regions but also for waterbird conservation and management.
文摘This paper describes the fishery catch structure of Vembanad wetland system during August 2012 to July 2013. The estimates of fishery production indicated an annual landing of 4387.31 t, in which 480.98 t and 3906.33 t contributed by southern and northern zone of Vembanad respectively. Eighty species of finfishes, five species of penaeid shrimps, three species of palaemonid prawns and two species of crabs were identified from the study period. The catch per unit effort (CPUE) value was maximum for gill net (3.04 kg·h-1) followed by stake net (2.43 kg·h-1), Chinese dip net (2.01 kg·h-1), seines (1.2 kg·h-1), cast net (0.72 kg·h-1) and hook and line (0.34 kg·h-1). Biological integrity and fishery production of estuaries in the country are declining mainly due to various man induced activities. Thaneermukkom barrage, the salinity barrier, constructed across the Vembanad wetland system in 1976, transforming the water body into two distinct ecosystems, a fresh water zone on the south and a brackish water zone on the north, resulting in gross changes in physical, chemical and biological entity of the aquatic ecosystem. In the southern zone of Vembanad the marine fish species were less available with the closure of the barrage period. There are signs of decline of the Vembanad fishery resources, evident in the lesser number of species and decline of fishery production. This will lead to biodiversity loss, fish stock reduction and will ultimately affect the livelihood support of the traditional fishers to a large extent, besides affecting other ecological services. A better conservation measure must be implemented for maintaining the sustainable fishery resources in Vembanad.
文摘East Kolkata Wetland (EKW) has been assigned the status of Ramsar Site because of its vastness as well as self purification capabilities which have been utilized by local people for the massive agricultural and aquaculture production for more than one century. In this context, an attempt has been made in the present paper to evaluate the existing environmental health of four selected contrasting wetlands of this eco-zone of global importance by qualitative and quantitative hydro-biological studies. Two of the selected wetlands (study site-III and study site-IV) used to receive water from raw sewage after undergoing phytoremediation process. The study site-II has been selected with a view to evaluate the pollution stress on the structural components of this wetland ecosystem as it receives waste water because of anthropogenic activities, and the study site-I is away from any pollution impact as it is located in a well managed natural park. Quantification of the variabilities of different biotic components caused by water pollution has been assessed by recording binary distribution patterns of zooplankton and similarity indices. Besides, new Biotic Indices (Species Pollution Value—SPV and Community Pollution Value—CPV) have been developed using data on the distributional patterns of zooplankton in order to assess the degree of pollution of the studied wetlands. Seasonal water quality data along with qualitative and quantitative information of biological parameters have also been taken into consideration to highlight the impact of phytoremediation on wetland ecosystem dynamics on one hand and pollution stress on the structural and functional components of the water body on the other hand.
基金supported by the Open Research Program of the International Research Center of Big Data for Sustainable Development Goals(CBAS2022ORP06)the Strategic Priority Research Program of Chinese Academy of Sciences(XDA19040500)+4 种基金the National Natural Science Foundation of China(42171372 and 42171379)the Youth Innovation Promotion Association of Chinese Academy of Sciences(2021227)the Open Fund of State Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University(19I02)the National Earth System Science Data Center(www.geodata.cn)Xiangming Xiao was supported by the U.S.National Science Foundation(1911955)。
基金This work was supported by the Schlumberger Foundation-Faculty for the Future[-]German Academic Exchange Service(DAAD)[-]grants fellowships.
文摘Introduction:The benefit of wetlands for reducing poverty depends on the effectiveness of governance systems that influence peoples’behaviour in the wise use of wetlands.Objectives:This article critically analyses the current poverty reduction strategies,agrarian policies and economic investments governing wetland usage,especially in Tanzania,with regard to their impact on sustainable Ramsar wetlands management.Methodology:It analyses the management structure,domestic policies and legal framework relating to the protection of wetlands in Tanzania in accordance to the wise use concept of the Ramsar Convention.Outcomes:Tanzanian legal provisions for wetland protection are uncoordinated and too limited in their coverage and scope to sufficiently address the destruction of wetland ecosystems.There is no comprehensive national legal framework to guide sustainable management of Ramsar wetlands in Tanzania as laid out by the Ramsar Convention,which the country ratified in the year 2000.Conclusion:Without a sound legislative and policy-making framework,Tanzanian wetlands and their diverse ecosystem services will continue to degenerate with current strategies of increasing agribusiness and other developmental projects or economic investments.This paper provides critical baseline information to inform decision makers to develop appropriate policy and laws,which promote the wise use of wetlands in Tanzania.
