Seagrass decline caused by the macroalgae blooms is becoming a common phenomenon throughout temperate and tropical regions. We summarized the incidence of macroalgae blooms throughout the world and their impact on sea...Seagrass decline caused by the macroalgae blooms is becoming a common phenomenon throughout temperate and tropical regions. We summarized the incidence of macroalgae blooms throughout the world and their impact on seagrass beds by direct and indirect ways. The competition for living space and using resources is the most direct effect on seagrass beds when macroalgae are blooming in an aquatic ecosystem. The consequence of macroalgae blooms(e.g., light reduction, hypoxia, and decomposition) can produce significant indirect effects on seagrass beds. Light reduction by the macroalgae can decrease the growth and recruitment of seagrasses, and decomposition of macroalgae mats can increase the anoxic and eutrophic conditions, which can further constrict the seagrass growth. Meanwhile, the presence of seagrass shoots can provide substrate for the macroalgae blooms. Controlling nutrient sources from the land to coastal waters is a general efficient way for coastal management. Researching into the synergistical effect of climate change and anthropognic nutrient loads on the interaction between searsasses and macroalgae can provide valuable information to decrease the negative effects of macroalgae blooms on seagrasses in eutrophic areas.展开更多
The distribution, species, biomass,productivity of main seagrasses and their sufferedmain threats are introduced and discussed in thispaper based on the field surveys in the offshore areas of Guangdong, Guangxi and Ha...The distribution, species, biomass,productivity of main seagrasses and their sufferedmain threats are introduced and discussed in thispaper based on the field surveys in the offshore areas of Guangdong, Guangxi and Hainan provinces.The seagrass beds distributed mainly in Liusha Bay,Donghai Island and Hailing Island of GuangdongProvince; Hepu and Pearl Bay of Guangxi ZhuangAutonomous Region; Li’an Bay, Xincun Bay, Longwan Bay and Sanya Bay of Hainan Province and soon. The total area of seagrass beds in the coastal seaof South China is about 2400 ha. There are about 8species, such as Halophila ovalis, Halodule uninervisHalophila beccarii, Zostera japonica, Enhalus acoroides, Thalassia hemperichii, Ruppia martime andCymodocea rotundata. These seagrasses have highbiomass and productivity. However, they are subjected to some threats resulting from artificial andnatural factors, especially anthropogenic causes,such as culture of shrimps and fishes, shellfish collection, fishing by means of poisons, electric powerand explosives as well as trawling, artificial pollution,dredging channels, and typhoons natural disaster.展开更多
There are abundant coastal wetlands in South China and their main characters are the tidal flats, mangroves and coral reefs. In this paper, the status quo of coastal wetlands in South China is introduced and their deg...There are abundant coastal wetlands in South China and their main characters are the tidal flats, mangroves and coral reefs. In this paper, the status quo of coastal wetlands in South China is introduced and their degradation trends in the last decades are analyzed based on the existing literatures and information. Their degradation trends are characterized by reduction of coastal wetlands’ area, pollution of seawater environment, degeneration of ecological environment, sharp decrease of biodiversity in the wetlands and so on. At the same time, the causes resulting in the above-mentioned degradations are discussed, mainly concluding imperfect systems of management and legislation, deficient property and assessment systems of the wetlands, weak consciousness of protecting coastal wetlands, shortage of basic study and backward management level and so on. Some countermeasures are put forward for the sake of a sustainable use of the coastal wetlands of South China, mainly including establishing and perfecting administrative and legal systems for the coastal wetlands, developing the study on assessment of coastal wetland, heightening the consciousness of public participation, and strengthening scientific research and establishment of wetland nature reserves.展开更多
基金funded by the Natural Science Foundation of China (41106099)CAS Scientific Project of Innovation and Interdisciplinary, the Ministry of Science and Technology Project Foundation (2014FY210600)+1 种基金Yantai Science and Technology Bureau (2011061)the Natural Science Foundation of Shandong Province (ZR 2009EQ006)
文摘Seagrass decline caused by the macroalgae blooms is becoming a common phenomenon throughout temperate and tropical regions. We summarized the incidence of macroalgae blooms throughout the world and their impact on seagrass beds by direct and indirect ways. The competition for living space and using resources is the most direct effect on seagrass beds when macroalgae are blooming in an aquatic ecosystem. The consequence of macroalgae blooms(e.g., light reduction, hypoxia, and decomposition) can produce significant indirect effects on seagrass beds. Light reduction by the macroalgae can decrease the growth and recruitment of seagrasses, and decomposition of macroalgae mats can increase the anoxic and eutrophic conditions, which can further constrict the seagrass growth. Meanwhile, the presence of seagrass shoots can provide substrate for the macroalgae blooms. Controlling nutrient sources from the land to coastal waters is a general efficient way for coastal management. Researching into the synergistical effect of climate change and anthropognic nutrient loads on the interaction between searsasses and macroalgae can provide valuable information to decrease the negative effects of macroalgae blooms on seagrasses in eutrophic areas.
文摘The distribution, species, biomass,productivity of main seagrasses and their sufferedmain threats are introduced and discussed in thispaper based on the field surveys in the offshore areas of Guangdong, Guangxi and Hainan provinces.The seagrass beds distributed mainly in Liusha Bay,Donghai Island and Hailing Island of GuangdongProvince; Hepu and Pearl Bay of Guangxi ZhuangAutonomous Region; Li’an Bay, Xincun Bay, Longwan Bay and Sanya Bay of Hainan Province and soon. The total area of seagrass beds in the coastal seaof South China is about 2400 ha. There are about 8species, such as Halophila ovalis, Halodule uninervisHalophila beccarii, Zostera japonica, Enhalus acoroides, Thalassia hemperichii, Ruppia martime andCymodocea rotundata. These seagrasses have highbiomass and productivity. However, they are subjected to some threats resulting from artificial andnatural factors, especially anthropogenic causes,such as culture of shrimps and fishes, shellfish collection, fishing by means of poisons, electric powerand explosives as well as trawling, artificial pollution,dredging channels, and typhoons natural disaster.
文摘There are abundant coastal wetlands in South China and their main characters are the tidal flats, mangroves and coral reefs. In this paper, the status quo of coastal wetlands in South China is introduced and their degradation trends in the last decades are analyzed based on the existing literatures and information. Their degradation trends are characterized by reduction of coastal wetlands’ area, pollution of seawater environment, degeneration of ecological environment, sharp decrease of biodiversity in the wetlands and so on. At the same time, the causes resulting in the above-mentioned degradations are discussed, mainly concluding imperfect systems of management and legislation, deficient property and assessment systems of the wetlands, weak consciousness of protecting coastal wetlands, shortage of basic study and backward management level and so on. Some countermeasures are put forward for the sake of a sustainable use of the coastal wetlands of South China, mainly including establishing and perfecting administrative and legal systems for the coastal wetlands, developing the study on assessment of coastal wetland, heightening the consciousness of public participation, and strengthening scientific research and establishment of wetland nature reserves.
