Title: A study of meiofauna in the COMRA's contracted area during the summer of 2005
Abstract: PDF HTML阅读 XML下载 导出引用 引用提醒 2005年夏季东太平洋中国多金属结核区小型底栖生物研究 DOI: 10.5846/stxb201111251801 作者: 作者单位: 国家海洋局海洋生态系统与生物地球化学重点实验室 国家海洋局第二海洋研究所,国家海洋局海洋生态系统与生物地球化学重点实验室 国家海洋局第二海洋研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 国家专项资助项目(DY125-14-E-02, DY125-14-E-01) A study of meiofauna in the COMRA's contracted area during the summer of 2005 Author: Affiliation: The Second Institute of Oceangraphy,SOA,The Second Institute of Oceangraphy,SOA Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:"大洋一号"调查船于2005年7月在太平洋结核区中国合同区东、西小区调查中共进行了12个站位的小型底栖生物的取样。研究表明:调查区域小型底栖生物共有13个类群。东、西两小区小型底栖生物平均密度分别为(104.4±20.48)个/10 cm2,(40.26±25.84)个/10 cm2,线虫平均生物量分别为(5.25±0.99)(μg·干重) /10 cm2,(1.68±0.77)(μg·干重) /10 cm2,东小区小型底栖生物平均密度、线虫生物量明显高于西小区。线虫是绝对优势类群,分别占东、西小区小型底栖生物总密度的93.13%和91.36%,其它优势类群有桡足类,多毛类,介形类等。小型底栖生物密度随着沉积物深度的增加而减少,其数量的75%以上分布在0-2 cm层,东小区深层的小型底栖生物所占比例比西小区要大。与环境因子相关分析表明:调查区域的小型底栖生物密度,线虫密度,线虫生物量,桡足类密度,多毛类密度与经、纬度呈显著负相关,与脱镁叶绿素呈显著正相关,与沉积物微型生物生物量相关性不显著。小型底栖生物密度,线虫密度,线虫生物量,多毛类密度与叶绿素a呈显著正相关,桡足类与叶绿素a相关性不显著。脱镁叶绿素与沉积物微型生物生物量呈显著正相关。 Abstract:Polymetallic nodules were discovered on the Pacific Ocean in 1891.They exist at the sediment surface, sometimes in upper layers of sediments, and cover more than 50% of the sea floor at Clarion-Clipperton fracture Zone (CCFZ) in the north Pacific.The huge economic value from nodule mining has brought to many research programs dedicated to resource evaluation and design of collecting tools in the 1970s. China has carried out surveys on polymetallic nodules and sediment in the CCFZ for many years. Since the late 1980s, China has already got 75000 km2 exclusive pioneer areas in COMRA's contracted area. One of the potential impacts of nodule mining is the destruction of the fauna attached to the partial covering of surrounding epifauna by sediment blanketing. Meiofauna, the important components of benthic ecosystem, are considered to be energetically important in benthic food web. as they play a critical role in the recycling of nutrients. In order to manage and mitigate these impacts, we need to better understand the composition and the distribution of meiofauna and its relationship to the environment. A quantitative study was carried out on "Dayang Yihao" in July 2005. The meiofauna samples were collected from 12 stations in eastern and western sub-area at COMRA’s contracted areas, Samples were collected using a multiple corer with four tubes of 9.5cm in diameter, and only undisturbed cores with clear overlying water were used. Thirteen benthic groups were found from the surveyed area,.The average density of meiofaunal were (104.4±20.48) ind/10cm2 and (40.26±25.84) ind/10cm2 in eastern and western sub-area, respectively. The average biomass of nematode were (5.25±0.99)(μg·Dry) /10cm2 and(1.68±0.77)(μg·Dry) /10cm2 in each sub-area. The analysis of spatial distribution has shown that the density of meiofauna and the biomass of nematode in eastern sub-area were substantially higher than that in western sub-area. Nematodes, copepods, polychaeta, and ostracoda were found to be the dominant taxa, and nematodes were the predominant one, constituting 93.13% and 91.36% of total density of meiofauna in eastern and western sub-area, respectively. The analysis of vertical distribution has shown that the density of meiofauna decreased with the depth in the sediment. The top 0-2cm layer of sediment accounted for over 75% of meiofauna. The proportion of meiofauna distributed in the deeper sediment was higher in eastern sub-area than that in western sub-area. In such an oligotrophic environment, low food supply may limit meiofaunal abundance, biomass,,and to a lesser extent species richness..In eastern sub-area, the average concentrations of chlorophyll a and phaeopigment in the top 6cm sediment were 0.004μg/cm2 and 0.169μg/cm2 respectively. In western sub-area, the average concentrations of chlorophyll a and phaeopigment in the top 6cm sediment were 0.002μg/cm2 and 0.082μg/cm2, respectively. There were significant positive relationships between chlorophyll a and phaeopigment in the surface sediment. The correlation between the meiofauna distribution and the environmental factors was investigated. The results indicated that (1) the density of the dominant groups (i.e. nematode, copepods, polychaetes) and the biomass of nematodes were significantly negatively correlated with the latitude and longitude; (2)but were significantly positively correlated with the amount of phaeopigment; (3) the biomass in the sediment had no significant impact on the density of meiofauna and their major groups, but was significantly positively correlated with the amount of phaeopigment; (4) the density of meiofauna, nematodes and polychaetes and the biomass of nematodes were significantly positive correlated with the amount of chlorophyll a; (5) the density of copepods has no sigifnicant correlation with the amount of chlorophyll a. 参考文献 相似文献 引证文献