摘要
对普里兹湾16个表层沉积物样品中的放射虫动物群进行了全属种鉴定和分析,共检出放射虫2目66属107种,其中罩笼虫目40属71种,泡沫虫目26属36种,前者的属种多样性和个体数量都显著高于后者。研究结果显示:普里兹湾放射虫多样性程度较低,但丰度较高,平均可达3.36万枚/g,呈现出陆架区>湾口区>冰架前缘的趋势,且湾西部高于东部,可能主要受研究区表层生产力、环流结构、沉积物类型和冷水团分布等海洋环境要素的影响。以Antarctissa strelkovi、Antarctissa denticulata为代表的Antarctissa group是该区最典型的优势种组合,平均百分含量高达42.43%,其分布主要受控于水体温度,其高含量具有指示冷水团分布的潜力,而该组合丰度的分布主要受环流和地形的影响;由Phormacantha hystrix、Plectacantha oikiskos和Rhizoplegmaboreale组成的特征种组合平均百分含量为12.54%,其丰度和含量的分布模式主要表征的是与环流结构有关的水团混合作用的强弱,对水深或离岸距离的指示作用并不明显。
Radiolarian faunas from 16 surface sediment samples of Prydz Bay are studied by the authors. A total of 2 orders, 66 genera and 107 species are identified, which consists of 71 Nasseillaria species(40 genera) and 36 Spumellaria species(26 genera),of which the former is obviously higher in genus-species diversity and quantity of individuals. Radiolarians in the surface sediments of Prydz Bay are low in diversity but high in abundance, which may reach 3.36×10~4ind/g(dry sample)on average. The distribution of abundance is in a descending order from the shelf zone, to the mouth of bay and to the front of ice shelf in general,and higher in the west but lower in the east, affected by such environmental factors as surface biological productivity, circulation pattern, sediment type and distribution of cold water mass. The Antarctissa group, mainly composed of Antarctissa strelkovi and Antarctissa denticulata, is the dominating assemblage in Prydz Bay, which may be as high as 42.43% on average depending upon water temperature.Therefore, the high percentage of this assemblage could be used as an indicator of cold water mass. The abundance of the assemblage is also affected by water circulation and subsurface topography. The typical assemblage, which is composed of Phormacantha hystrix,Plectacantha oikiskos and Rhizoplegma boreale, occupies 12.54% in samples. Its distribution pattern of abundance is an indicator to the mixing degree of water mass of concerned circulating currents, but not water depth or the distance to the coast in the bay.
作者
朱林林
张海峰
潘建明
胡佶
朱秋红
张海生
ZHU Linlin;ZHANG Haifeng;PAN Jianming;HU Ji;ZHU Qiuhong;ZHANG Haisheng(Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;State Key Laboratory of Marine Geology,Tongji University, Shanghai 200092, China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2019年第4期96-106,共11页
Marine Geology & Quaternary Geology
基金
国家自然科学基金青年项目“南极普里兹湾放射虫对现代海洋环境变化的生态响应”(41506223),“利用生物标志化合物研究西太平洋雅浦海沟沉积有机碳的来源、分布和保存”(41606090)
自然资源部第二海洋研究所基本科研业务专项“南极普里兹湾放射虫的现代沉积过程研究”(JG1404),“近二百年南极半岛海洋浮游生态系统演变的沉积记录”(JG1805),“雅浦海沟沉积有机碳的来源和保存”(JG1516)
南北极环境综合考察与评估专项“南极环境综合分析与评价”CHINARE04-01),“南极周边海域海洋化学与碳通量考察”CHINARE01-04)
关键词
表层沉积物
放射虫
优势种组合
特征种组合
普里兹湾
surface sediment
radiolarian
dominant assemblage
characteristic assemblage
Prydz Bay
