Fish species composition and spatio-temporal variability of the community were studied in a tropical seagrass meadow located in a lagoon in the eastern part of North Sulawesi. The diversity of fish community in the se...Fish species composition and spatio-temporal variability of the community were studied in a tropical seagrass meadow located in a lagoon in the eastern part of North Sulawesi. The diversity of fish community in the seagrass meadows was relatively high, with the Shannon-Wiener index ranging from 1.57 to 3.69. The family Apogonidae was the most dominant in abundance(8.27 ind./(100 m2)) and biomass(28.49 g/(100 m2)). At the species level,Apogon lateralis and Sphaeramia orbicularis were the most dominant species in abundance and biomass,respectively. For spatial distribution on species, the end, middle and mouth of the lagoon clustered together as a whole, which may be due to the substrate types found in those zones. The fish species, fish abundance and fish biomass were greater in the dry and wet seasons than in the transition season, which is explained by the strong monsoon, which provides a more suitable environment and food for the fish. The maximum length of 93.10% of the captured species was less than their length at maturity, indicating that seagrass meadows are nursery habitats for many fishes. Therefore, protection of the seagrass meadows is essential for fisheries and sustainable resource utilization.展开更多
Seagrass meadows are generally diverse in China and have become important ecosystem with essential functions.However,the seagrass distribution across the seawaters of China has not been evaluated,and the magnitude and...Seagrass meadows are generally diverse in China and have become important ecosystem with essential functions.However,the seagrass distribution across the seawaters of China has not been evaluated,and the magnitude and direction of changes in seagrass meadows remain unclear.This study aimed to provide a nationwide seagrass distribution map and explore the dynamic changes in seagrass population under global climate change.Simulation studies were performed using the modeling software MaxEnt with 58961 occurrence records and 27 marine environmental variables to predict the potential distribution of seagrasses and calculate the area.Seven environmental variables were excluded from the modeling processes based on a correlation analysis to ensure predicted suitability.The predicted area was 790.09 km^(2),which is much larger than the known seagrass distribution in China(87.65 km^(2)).By 2100,the suitable habitat of seagrass will shift northwest and increase to 923.62 km2.Models of the sum of the individual family under-pre-dicted the national distribution of seagrasses and consistently showed a downward trend in the future.Out of all environmental vari-ables,physical parameters(e.g.,depth,land distance,and sea surface temperature)contributed the most in predicting seagrass distri-butions,and nutrients(e.g.,nitrate,phosphate)ranked among the key influential predictors for habitat suitability in our study area.This study is the first effort to fill a gap in understanding the distribution of seagrasses in China.Further studies using modeling and biological/ecological approaches are warranted.展开更多
Seagrass research in China is still in its infancy. Even though there has been progress recently, there is still a great deal of research needed to gain a better understanding of seagrass. In this article we review an...Seagrass research in China is still in its infancy. Even though there has been progress recently, there is still a great deal of research needed to gain a better understanding of seagrass. In this article we review and discuss the advances in seagrass research in China from two aspects: (1) seagrass species and their distribution; (2) seagrass research in China, including studies on their taxonomy, ecology, photosynthesis, applications in aquaculture, salt-tolerance mechanisms and other research topics. A total of 18 seagrass species belonging to 8 genera are distributed in nine provinces and regions in China (including Hong Kong and Taiwan), as well as the Xisha and Nansha Archipelagos. They can be divided into two groups: a North China Group and a South China Group. Based on the seagrass distribution, the Chinese mainland coast can be divided into three sections: North China Seagrass Coast, Middle China Seagrass Coast, and South China Seagrass Coast. Ecological studies include research on seagrass communities, nutrient cycling in seagrass ecosystems, genetic diversity, pollution ecology and research in the key regions of Shandong, Guangdong, Guangxi, and Hainan. Seagrass species and their locations, community structure, ecological evaluation, epiphytes, ecological functions and threats in the key regions are also summarized. Other studies have focused on remote sensing of seagrass, threatened seagrass species of China, and pollen morphology of Halophila ovalis.展开更多
The productivity and health of seagrass depend on the combined inputs of nutrients from the water and sediments in which they grow and the microbiota with which they live intimately.However,little is known about the c...The productivity and health of seagrass depend on the combined inputs of nutrients from the water and sediments in which they grow and the microbiota with which they live intimately.However,little is known about the composition and diversity pattern of single-celled benthic eukaryotes in seagrass meadows.Here,we investigated how the structure and diversity of the benthic microeukaryotic community vary with respect to season,location,and seagrass colonization,by applying 18S rRNA gene amplicon sequencing for 96 surface sediment samples that were collected from three different seagrass habitats through four seasons.We found that benthic microeukaryotic communities associated with seagrass Zostera japonica exhibited remarkable spatial and seasonal variations,as well as differences between vegetated and unvegetated sediments.Diatoms and dinoflagellates predominated in the benthic microeukaryotic communities,but they were inversely correlated and displaced each other as the dominant microbial group in different seasons or habitats.Mucoromycota was more prevalent in vegetated sediments,whereas Lobulomycetales and Chytridiales had higher proportions in unvegetated sites.Total organic carbon and total organic nitrogen were the most important environmental factors in driving the microeukaryotic assemblages and diversity.Our study expands the available knowledge on the biogeographic distribution patterns and niche preferences for benthic microeukaryotes in seagrass systems.展开更多
海草床是全球分布最广泛的滨海湿地生态系统,提供着重要的生态服务功能。但是近年来,在人类活动和气候变化的双重作用下,海草床不断退化。食物网是海草床生态系统的重要组成部分,研究食物网营养级之间的相互作用关系对于海草床的生物多...海草床是全球分布最广泛的滨海湿地生态系统,提供着重要的生态服务功能。但是近年来,在人类活动和气候变化的双重作用下,海草床不断退化。食物网是海草床生态系统的重要组成部分,研究食物网营养级之间的相互作用关系对于海草床的生物多样性和稳定性具有重要的意义。通过检索Web of Science和CNKI数据库中收录的海草床食物网营养级相互作用关系的相关文献,从研究区域、种类分布、营养级相互作用类型、环境影响因子以及研究方法等方面进行了文献分析,以期阐明国内外海草床食物网营养级研究相关进展。结果表明:目前的主要研究区域具有一定的地域性,以保护和恢复较好的区域为主;研究的海草种类主要为广泛分布的种类;研究的相互作用类型主要为食物网的部分环节,缺乏对整个营养级动态变化的研究;研究考虑的环境因子主要是富营养化的影响,而对于其他环境因子的动态变化涉及较少;目前的研究方法以模拟实验为主,多偏向于静态或者短期的模拟,缺乏对长期动态变化过程的模拟研究。展开更多
基金The China-Indonesia Maritime Cooperation Fund Project "China-Indonesia Bitung Ecological Station Establishment"the National Natural Science Foundation of China under contract Nos 41676096 and 41506123+3 种基金the Biodiversity of Coastal Ecosystem,Kema,North Sulawesithe Scientific Research Foundation of Third Institute of Oceanography,SOA under contract No.2015024the National Key Research and Development Program of China under contract Nos 2017YFC1405101 and2017YFC0506105the Public Science and Technology Research Funds Projects of Ocean under contract No.201505009
文摘Fish species composition and spatio-temporal variability of the community were studied in a tropical seagrass meadow located in a lagoon in the eastern part of North Sulawesi. The diversity of fish community in the seagrass meadows was relatively high, with the Shannon-Wiener index ranging from 1.57 to 3.69. The family Apogonidae was the most dominant in abundance(8.27 ind./(100 m2)) and biomass(28.49 g/(100 m2)). At the species level,Apogon lateralis and Sphaeramia orbicularis were the most dominant species in abundance and biomass,respectively. For spatial distribution on species, the end, middle and mouth of the lagoon clustered together as a whole, which may be due to the substrate types found in those zones. The fish species, fish abundance and fish biomass were greater in the dry and wet seasons than in the transition season, which is explained by the strong monsoon, which provides a more suitable environment and food for the fish. The maximum length of 93.10% of the captured species was less than their length at maturity, indicating that seagrass meadows are nursery habitats for many fishes. Therefore, protection of the seagrass meadows is essential for fisheries and sustainable resource utilization.
基金supported by the National Key R&D Program of China(No.2019YFC1408405-02)the National Natural Science Foundation of China(No.6207070555)the Youth Foundation of the Shandong Academy of Sciences(No.2019QN0026).
文摘Seagrass meadows are generally diverse in China and have become important ecosystem with essential functions.However,the seagrass distribution across the seawaters of China has not been evaluated,and the magnitude and direction of changes in seagrass meadows remain unclear.This study aimed to provide a nationwide seagrass distribution map and explore the dynamic changes in seagrass population under global climate change.Simulation studies were performed using the modeling software MaxEnt with 58961 occurrence records and 27 marine environmental variables to predict the potential distribution of seagrasses and calculate the area.Seven environmental variables were excluded from the modeling processes based on a correlation analysis to ensure predicted suitability.The predicted area was 790.09 km^(2),which is much larger than the known seagrass distribution in China(87.65 km^(2)).By 2100,the suitable habitat of seagrass will shift northwest and increase to 923.62 km2.Models of the sum of the individual family under-pre-dicted the national distribution of seagrasses and consistently showed a downward trend in the future.Out of all environmental vari-ables,physical parameters(e.g.,depth,land distance,and sea surface temperature)contributed the most in predicting seagrass distri-butions,and nutrients(e.g.,nitrate,phosphate)ranked among the key influential predictors for habitat suitability in our study area.This study is the first effort to fill a gap in understanding the distribution of seagrasses in China.Further studies using modeling and biological/ecological approaches are warranted.
基金Supported by Guangxi Science Foundation (No. 0832030)Scientific Research Fund of Guangxi University (2008)+1 种基金UNDP/GEF/SCCBD Project (SCCBD/CPR/02/31)Guangxi Key Lab Fund (No. 07109007)
文摘Seagrass research in China is still in its infancy. Even though there has been progress recently, there is still a great deal of research needed to gain a better understanding of seagrass. In this article we review and discuss the advances in seagrass research in China from two aspects: (1) seagrass species and their distribution; (2) seagrass research in China, including studies on their taxonomy, ecology, photosynthesis, applications in aquaculture, salt-tolerance mechanisms and other research topics. A total of 18 seagrass species belonging to 8 genera are distributed in nine provinces and regions in China (including Hong Kong and Taiwan), as well as the Xisha and Nansha Archipelagos. They can be divided into two groups: a North China Group and a South China Group. Based on the seagrass distribution, the Chinese mainland coast can be divided into three sections: North China Seagrass Coast, Middle China Seagrass Coast, and South China Seagrass Coast. Ecological studies include research on seagrass communities, nutrient cycling in seagrass ecosystems, genetic diversity, pollution ecology and research in the key regions of Shandong, Guangdong, Guangxi, and Hainan. Seagrass species and their locations, community structure, ecological evaluation, epiphytes, ecological functions and threats in the key regions are also summarized. Other studies have focused on remote sensing of seagrass, threatened seagrass species of China, and pollen morphology of Halophila ovalis.
基金The National Key Research and Development Program under contract No.2020YFD0901003the National Natural Science Foundation of China under contract Nos 92051119,42077305 and 32070112+2 种基金the Special National Project on Investigation of Basic Resources of China under contract No.2019FY100700the Key Research Project of Frontier Science of Chinese Academy of Sciences under contract No.QYZDB-SSW-DQC041the Taishan Scholar Project Special Funding under contract No.Tspd20210317。
文摘The productivity and health of seagrass depend on the combined inputs of nutrients from the water and sediments in which they grow and the microbiota with which they live intimately.However,little is known about the composition and diversity pattern of single-celled benthic eukaryotes in seagrass meadows.Here,we investigated how the structure and diversity of the benthic microeukaryotic community vary with respect to season,location,and seagrass colonization,by applying 18S rRNA gene amplicon sequencing for 96 surface sediment samples that were collected from three different seagrass habitats through four seasons.We found that benthic microeukaryotic communities associated with seagrass Zostera japonica exhibited remarkable spatial and seasonal variations,as well as differences between vegetated and unvegetated sediments.Diatoms and dinoflagellates predominated in the benthic microeukaryotic communities,but they were inversely correlated and displaced each other as the dominant microbial group in different seasons or habitats.Mucoromycota was more prevalent in vegetated sediments,whereas Lobulomycetales and Chytridiales had higher proportions in unvegetated sites.Total organic carbon and total organic nitrogen were the most important environmental factors in driving the microeukaryotic assemblages and diversity.Our study expands the available knowledge on the biogeographic distribution patterns and niche preferences for benthic microeukaryotes in seagrass systems.
文摘海草床是全球分布最广泛的滨海湿地生态系统,提供着重要的生态服务功能。但是近年来,在人类活动和气候变化的双重作用下,海草床不断退化。食物网是海草床生态系统的重要组成部分,研究食物网营养级之间的相互作用关系对于海草床的生物多样性和稳定性具有重要的意义。通过检索Web of Science和CNKI数据库中收录的海草床食物网营养级相互作用关系的相关文献,从研究区域、种类分布、营养级相互作用类型、环境影响因子以及研究方法等方面进行了文献分析,以期阐明国内外海草床食物网营养级研究相关进展。结果表明:目前的主要研究区域具有一定的地域性,以保护和恢复较好的区域为主;研究的海草种类主要为广泛分布的种类;研究的相互作用类型主要为食物网的部分环节,缺乏对整个营养级动态变化的研究;研究考虑的环境因子主要是富营养化的影响,而对于其他环境因子的动态变化涉及较少;目前的研究方法以模拟实验为主,多偏向于静态或者短期的模拟,缺乏对长期动态变化过程的模拟研究。
