报告题目

水生生物多样性对土地利用变化的响应规律及机制

Title:

Response Law and Mechanism of Aquatic Biodiversity to Land Use Change

报告人--陈凯

Lecturer: Kai Chen

陈凯，博士，南京农业大学植物保护学院昆虫系。从事水生生物多样性与全球变化生态学研究，以底栖动物和鱼类为指示生物，主要开展基于水生生物完整性的水生态系统健康评价研究、和全球土地利用变化影响水生生物多样性及其生态效应研究。主持国家自然科学基金、江苏省自然科学基金、中国博士后科学基金等项目。于Global Change Biology、Science of the Total Environment、中国环境科学、生物多样性、生态学报发表和共同发表SCI、EI和中文核心期刊论文多篇。于2012-2013年和2018一2019年分别完成美国UtahState University和University of Washington的访问学者项目；多次在美国Pacific Ecological Systems Division， US EPA、Annual Meeting of the Society for Freshwater Science、Symposium of Benthological Society of Asia、中国科学院水生生物研究所等国际著名研究单位和国际会议进行学术交流。

Kai Chen, Ph.D., Department of Entomology, College of Plant Protection, Nanjing Agricultural University. He is engaged in the research of aquatic biodiversity and global change ecology, with benthic animals and fish as indicator organisms, mainly carrying out the research of aquatic ecosystem health evaluation based on aquatic biodiversity integrity and the research of global land use change affecting aquatic biodiversity and its ecological effects. He has hosted National Natural Science Foundation of China, Natural Science Foundation of Jiangsu Province, and China Postdoctoral Science Fund. He has published plenty of papers in SCI, EI and Chinese core journals in Global Change Biology, Science of the Total Environment, China Environmental Science, Biodiversity Science, and Acta Ecologica Sinica as the first author or the co-author. He was the visiting scholar of Utah State University from 2012 to 2012 and of University of Washington from 2018 to 2019. And he has made numerous academic exchanges at Pacific Ecological Systems Division, US EPA, Annual Meeting of the Society for Freshwater Science, Symposium of Benthological Society of Asia, Institute of Hydrobiology of Chinese Academy of Sciences and others.

报告内容

土地利用变化是引起水生生物多样性及其生态系统功能持续丧失和退化的重要全球变化因素，确定水生生物群落响应土地利用变化的生态阈值，是应对全球土地资源持续开发压力下水生生物多样性保护的关键。利用来自全球四大洲温带、亚热带和北部气候带8个国家和地区共13069个河流样点的数据，通过描述水生生物群落物种组成变化和更替对土地利用变化的非线性响应特征；首次定量阐明了全球尺度不同地理区系鱼类群落响应土地利用改变的阈值及其宏观空间尺度一致性，鱼类群落组成对流域城市化(1%-12%)和农业化(2%-37%)响应的生态阈值一般发生在土地利用较低的水平；同时，明确了淡水鱼类群落组成响应土地利用变化较鱼类丰富度的响应敏感；揭示了当前鱼类群落组成改变对土地利用遗留效应的响应规律，历史土地利用增加程度较高流域的鱼类群落呈现更高的当前生态响应阈值；定量揭示了引起水生生物类群对城镇化和农业用地等不同土地利用变化响应差异性的重要功能性状，如：体长、水温偏好性、繁殖策略、化性和营养策略等。研究结果为揭示水生生物群落组成对复杂动态土地利用变化的响应机制提供了新的认识，有助于面临土地利用重大变化的地区考虑和设定优先管理和保护战略。

Content:

Land use change is an important global change factor that causes continuous loss and degradation of aquatic biodiversity and its ecosystem functions, and to determine the ecological thresholds of aquatic communities in response to land use change is the key to the conservation of aquatic biodiversity under the pressure of continuous exploitation of global land resources. Using data collected from a total of 13,069 rivers from temperate, subtropical and northern climate zones of eight countries and regions in four continents and characterizing the nonlinear response of aquatic community species composition change to land use change, the thresholds of fish community response to land use change in different geographic zones at the global scale and their consistency in macroscopic spatial scale are for the first time quantitatively elucidated, and the ecological thresholds for the response of fish community composition to watershed urbanization (1%-12%) and agriculturalization (2%-37%) generally occur at lower land use levels; meanwhile, it is clear that the response of freshwater fish community composition to land use change is more sensitive than that of fish abundance; the response pattern of current fish community composition change to the legacy effect of land use is revealed; higher current ecological response thresholds are exhibited in fish communities in watersheds with higher historical land-use increases; and important functional traits that cause differences in the response of aquatic biological groups to different land-use changes are quantitatively revealed, such as body length, water temperature preference, reproductive strategy and trophic strategy. The results of the study provide new insights into the response mechanisms of aquatic community composition to complex dynamic land use changes, and help to consider and set priority management and conservation strategies in areas facing major land use changes.

时间：2021年9月7日(星期二)下午3：30-5：00

地点：南海海洋资源利用国家重点实验室823室

主办：南海海洋资源利用国家重点实验室

欢迎广大教师、科研人员和研究生等踊跃参加!

Time: September 7, 2021 (Tuesday), 3:30pm-5:00pm

Place: Room 823, MRU

Sponsor: MRU

All teachers, scientific research personnel and graduate students are welcome to attend!