水生态学杂志2024，Vol.45Issue(3)：156-164,9.DOI:10.15928/j.1674-3075.202205200183
长江中游2个湖泊沉积物枝角类微化石密度的垂直变化
Vertical Variation in the Density of Cladoceran Microfossils in the Sediments of Two Lakes Located in the Middle Yangtze River
摘要
Abstract
Cladocera microfossils preserved in lake sediments can be used to reconstruct the community succession history of cladocera,and reflect the disturbance intensity of human activities.In this study,the vertical changes of composition and density of cladoceran remains in the sediments of two lakes(Long-gan Lake and Wuchang Lake)were studied,and the effects of anthropogenic disturbance on cladoceran composition and density were discussed.In June 2019,sediment samples were collected at two sites(LG1 and LG2)in Longgan Lake and one site(WC)in Wuchang Lake,and two sediment cores were collected at each site and cladoceran ephippium and genus Bosmina spines were counted and identified.The con-centrations of total nitrogen and phosphorus in the sediments and the ages of the sediments were deter-mined.Results show that LG1 and LG2 displayed 90 years and 105 years of sediment history in Longgan Lake and WC displayed 58 years of sediment history in Wuchang Lake.There were 9 species of cladocer-an ephippium identified in Longgan Lake and 12 species identified in Wuchang Lake.The total density(dry weight)of cladoceran ephippium was 2.27 ind/g in Longgan Lake sediment and 1.63 ind/g in Wuchang Lake and the density of Bosmina spines(459.40 ind/g)was significantly higher than that in Wuchang Lake(1.52 ind/g).Since the 1960s,the dominant cladocerans have changed from Moina spp.and Alona sp.to Moina spp.and Chydorus sp.in the sediments of Wuchang Lake.In Longgan Lake,the dominant cladoceran was Chydorus sp.and Moina spp.before 1950 but Bosmina sp.after 1950.The changes in vertical density of cladoceran ephippium and Bosmina spines in two lakes were consistent with the process of eutrophication and the history of fish aquaculture.Our results indicate that the anthropogen-ic interference intensity influenced the composition and density of cladoceran microfossils in lake sedi-ments located in the middle and lower reaches of the Yangtze River.关键词
枝角类/微化石/湖泊沉积物/富营养化/龙感湖/武昌湖Key words
cladoceran/microfossil/lake sediments/eutrophication/Longgan Lake/Wuchang Lake分类
生物科学引用本文复制引用
戚惠颖,曹雅芹,张坤,曹惠娟,赵雅洁,葛博蔚,邓道贵..长江中游2个湖泊沉积物枝角类微化石密度的垂直变化[J].水生态学杂志,2024,45(3):156-164,9.基金项目
辽宁省科学技术计划项目(2021JH2/10200012) （2021JH2/10200012）
国家自然科学基金(32273186) （32273186）
大连市支持高层次人才创新创业项目(2020RQ0111) （2020RQ0111）
设施渔业教育部重点实验室开放课题(202211) （202211）
大连海洋大学创新创业训练计划(X202210158025). （X202210158025）
