粤东品清湖表层沉积物介形类空间分布特征及其环境意义  

DISTRIBUTION CHARACTERISTICS OF THE OSTRACODS IN THE SURFACE SEDIMENTS OF THE PINQING LAKE IN THE EASTERN GUANGDONG PROVINCE AND THEIR ENVIRONMENTAL SIGNIFICANCE

作　　者：伍嘉慧 董旭辉 陈斌[1] 冼汉标 王雅婧 曹倩婷 叶佳延 WU Jiahui;DONG Xuhui;CHEN Bin;XIAN Hanbiao;WANG Yajing;CAO Qianting;YE Jiayan(School of Geography and Remote Sensing,Guangzhou University,Guangzhou 510006;Center for Climate and Environmental Change,Guangzhou University,Guangzhou 510006)

机构地区：[1]广州大学地理科学与遥感学院,广州510006 [2]广州大学气候与环境变化研究中心,广州510006

出　　处：《微体古生物学报(中英文)》2024年第4期370-383,共14页Acta Micropalaeontologica Sinica

基　　金：广州大学校内科研项目(编号YJ2023031);大学生创新创业项目(编号S202411078027)共同资助。

摘　　要：介形类已被广泛用作淡水和海洋环境变化的指标,但其在海陆交互带的潟湖中的群落特征及环境意义尚未充分研究。本研究选择了华南典型潟湖——品清湖,对其水体及表层沉积物的理化性质及现生的底栖介形类进行了系统调查。研究发现,湖泊盐度、水深呈入海口向东部沿岸减小的梯度变化,变化范围为30‰-20‰,6.9~1.8 m,而底质变化呈砂向黏土转换的趋势。20个表层样品中共鉴定出了32属38种介形类,以Sinocytheridea impressa,Neomonoceratina delicata,Loxoconcha zhejiangensis,Aurila cymba等属种为主。多元统计分析揭示出水体盐度和沉积物铜是影响介形类群落的关键因素。盐度促进介形类物种丰富度的增加,例如从湖岸到入海口呈现真盐型属种(A.cymba,N.delicata,Stigmatocythere roesmani)显著增加;而随着铜含量的升高,介形类浓度降低且仅少数耐污属种占优。研究对品清湖内出现的介形类优势属种的个体生态学特征进行了梳理,为今后的古环境重建奠定了基础。特别的,A.cymba对盐度变化敏感,可指示盐度30‰以上的水环境;L.zhejiangensis能耐受高铜含量,是潟湖环境底泥重金属铜污染的指示性生物。Ostracods have been widely used as indicators of changes in freshwater and marine,however their characteristics in marine–terrestrial lagoons have not been fully studied.This study selected Pinqing Lake,a typical lagoon in South China,to conduct a systematic investigation of the physical and chemical characteristics of water body and surface sediments,as well as the benthic ostracods.The study found that the salinity and water depth change gradually from the sea mouth to the eastern coast with a decreasing gradient,ranging from 30‰to 20‰and 6.9 to 1.8 m repectively;the substrate change from the sea mouth to the northern coast shows a trend of sand to clay.A total of 32 genera and 39 species of ostracods were identified,dominated by Sinocytheridea impressa,Neomonoceratina delicata,Loxoconcha zhejiangensis,and Aurila cymba.Multivariate statistical analysis results showed that salinity and copper were the key factors affecting the ostracods.Salinity promotes an increase in the abundance of ostracods species.For example,euryhaline species(S.impressa,L.zhejiangensis,B.bisanensis,and S.quadriaculeata)increased significantly from the sea mouth to the coast.As the copper content increased,the concentration of ostracods decreased,and only a few pollution-tolerant species(S.impressa,L.zhejiangensis)were able to survive The study figured out the individual ecological characteristics of the dominant ostracods species that appeared in Pinqing Lake,laying the foundation for future paleoenvironmental reconstruction:in particular,A.cymba is sensitive to salinity change and can indicate a water salinity above 30‰;L.zhejiangensis which can tolerate high copper content has the potential to be used as a bioindicator of heavy metal pollution in lagoon environments.

关 键 词：介形类 潟湖 盐度 生态特征 环境指示 

分 类 号：Q915[天文地球—古生物学与地层学] X143[生物学—古生物学] X174[环境科学与工程—环境科学]