Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation effi...Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation efficiencies were clearly improved with increasing C/N ratio in reed wetland sediments, tidal wetlands sediments and estuary wetland sediments. The quantitative response relationships between DBT degradation rates and related functional genes demonstrate that the Kodama pathway-related gene groups were dominant factors at low C/N ratios, while the 4S-related gene groups mainly determined the degradation rate when the C/N ratio was up to 5. Network analysis also shows that the pathway shifts from the Kodama pathway to the 4S pathway occurred through changes in the connections between functional genomes and rates. Furthermore, there were competition and collaboration between the Kodama and 4S pathways. The 4S pathway-related bacteria were more active in estuary wetland sediments compared with reed wetland sediments and tidal wetland sediments. The higher degradation efficiency in estuary wetland sediments may indicate the greater participation of the 4S pathway in the DBT biodegradation reaction. And the effects of ring cleavage of Kodama pathway caused more complete metabolizing of DBT.展开更多
There has been an increase of community studies that incorporate the use of functional diversity indices. The incorporation of these indices in the analysis of marine communities is recent, however, could contribute w...There has been an increase of community studies that incorporate the use of functional diversity indices. The incorporation of these indices in the analysis of marine communities is recent, however, could contribute with relevant information about the health of those communities. The lagoon of La Paz is a body of water located in La Paz, B.C.S., México. Despite its regional importance, there are not recent studies about its fish communities. Therefore, the aim of the present study was to analyze the temporal and spatial structure of the functional diversity of fish communities associated to soft bottoms, from August 2016 to July 2017, as well as important environmental variables. Functional diversity indices showed significant differences between months. Spatial analysis did not show significant differences perhaps due to low variability of the type of substrate. Temperature showed temporal differences as well. Therefore, temperature may be a limiting environmental variable for many fish species inhabiting coastal lagoons.展开更多
随着全球滨海湿地面积的损失和生态系统功能的持续退化,利用水文连通修复来提升与改善滨海湿地生态系统功能已成为全球的重要策略。通过梳理Web of Science数据库中1950—2024年的7225篇文献,揭示了全球滨海湿地水文连通修复的时空分布...随着全球滨海湿地面积的损失和生态系统功能的持续退化,利用水文连通修复来提升与改善滨海湿地生态系统功能已成为全球的重要策略。通过梳理Web of Science数据库中1950—2024年的7225篇文献,揭示了全球滨海湿地水文连通修复的时空分布特征,归纳了陆向水文连通修复和海向水文连通修复的主要方法,以及滨海湿地水文连通修复对初级生产力、海岸防护、碳储存和生物多样性保护等关键生态系统功能的影响机理和研究进展;从影响因素众多、恢复周期漫长、响应过程多变和功能权衡复杂等视角总结了当前利用滨海湿地水文连通提升生态系统功能的挑战。针对当前的研究进展和存在的问题,展望了未来的研究趋势,可为解决滨海湿地生态系统功能提升面临的基础科学问题提供支持。展开更多
基金Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No.51721006)the National Natural Science Foundation of China (No.51679001) provided support for this study
文摘Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation efficiencies were clearly improved with increasing C/N ratio in reed wetland sediments, tidal wetlands sediments and estuary wetland sediments. The quantitative response relationships between DBT degradation rates and related functional genes demonstrate that the Kodama pathway-related gene groups were dominant factors at low C/N ratios, while the 4S-related gene groups mainly determined the degradation rate when the C/N ratio was up to 5. Network analysis also shows that the pathway shifts from the Kodama pathway to the 4S pathway occurred through changes in the connections between functional genomes and rates. Furthermore, there were competition and collaboration between the Kodama and 4S pathways. The 4S pathway-related bacteria were more active in estuary wetland sediments compared with reed wetland sediments and tidal wetland sediments. The higher degradation efficiency in estuary wetland sediments may indicate the greater participation of the 4S pathway in the DBT biodegradation reaction. And the effects of ring cleavage of Kodama pathway caused more complete metabolizing of DBT.
文摘There has been an increase of community studies that incorporate the use of functional diversity indices. The incorporation of these indices in the analysis of marine communities is recent, however, could contribute with relevant information about the health of those communities. The lagoon of La Paz is a body of water located in La Paz, B.C.S., México. Despite its regional importance, there are not recent studies about its fish communities. Therefore, the aim of the present study was to analyze the temporal and spatial structure of the functional diversity of fish communities associated to soft bottoms, from August 2016 to July 2017, as well as important environmental variables. Functional diversity indices showed significant differences between months. Spatial analysis did not show significant differences perhaps due to low variability of the type of substrate. Temperature showed temporal differences as well. Therefore, temperature may be a limiting environmental variable for many fish species inhabiting coastal lagoons.
文摘随着全球滨海湿地面积的损失和生态系统功能的持续退化,利用水文连通修复来提升与改善滨海湿地生态系统功能已成为全球的重要策略。通过梳理Web of Science数据库中1950—2024年的7225篇文献,揭示了全球滨海湿地水文连通修复的时空分布特征,归纳了陆向水文连通修复和海向水文连通修复的主要方法,以及滨海湿地水文连通修复对初级生产力、海岸防护、碳储存和生物多样性保护等关键生态系统功能的影响机理和研究进展;从影响因素众多、恢复周期漫长、响应过程多变和功能权衡复杂等视角总结了当前利用滨海湿地水文连通提升生态系统功能的挑战。针对当前的研究进展和存在的问题,展望了未来的研究趋势,可为解决滨海湿地生态系统功能提升面临的基础科学问题提供支持。
