夏季南黄海冷水团及其周边海域小型底栖动物类群组成与分布

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 夏季南黄海冷水团及其周边海域小型底栖动物类群组成与分布 DOI: 10.5846/stxb201405221061 作者: 作者单位: 中国海洋大学海洋生命学院,中国海洋大学,中国海洋大学海洋生命学院,中国海洋大学海洋生命学院,中国海洋大学海洋生命学院,中国海洋大学海洋生命学院 作者简介: 通讯作者: 中图分类号: 基金项目: 中国海洋大学中央高校基本科研业务费专项项目(201462008);国家自然科学基金项目(41006081);山东省优秀中青年科学家科研奖励基金项目(BS2013HZ008) Meiofaunal assemblage and distribution in the southern Yellow Sea Cold Water Mass and its adjacent waters in summer Author: Affiliation: College of Marine Life Sciences,Ocean University of China,College of Marine Life Sciences,Ocean University of China,College of Marine Life Sciences,Ocean University of China,College of Marine Life Sciences,Ocean University of China,College of Marine Life Sciences,Ocean University of China,College of Marine Life Sciences,Ocean University of China 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:对2011年6月南黄海冷水团及其周边海域23个站位的小型底栖动物类群组成、丰度、生物量和空间分布及其与环境因子的关系进行了研究。结果表明,调查海域共鉴定出小型底栖动物20个类群,平均丰度为(1194 ±873)个/10 cm2,平均生物量为(881±669)μg干重/10 cm2,其中自由生活海洋线虫是绝对优势类群,占小型底栖动物总丰度的89.7%,其次为底栖桡足类(5.5%)、甲壳类幼体(1.8%)、多毛类(1.2%);对生物量的贡献上依次为海洋线虫(49.0%)、多毛类(22.9%)、桡足类(13.9%)、介形类(7.8%)、涡虫(2.0%)。在垂直分布上,79.1%的小型底栖动物分布在沉积物0-2 cm的表层,16.4%分布在2-5 cm的次表层, 4.5%的小型底栖动物分布在5-8 cm的下层。与环境因子的相关性分析表明,小型底栖动物的总丰度和总生物量与沉积物叶绿素a含量显著正相关;小型底栖动物的生物量和沉积物中部分重金属(Pb、Cu、Fe、Ni、Co)含量呈显著负相关,但与Cd含量呈极显著正相关。BIOENV分析结果表明,沉积物含水量、有机质含量和分选系数组合最能解释小型底栖动物类群组成分布差异。根据小型底栖动物的类群组成可将研究海域划分为3个区域,包括:冷水团中央区域,冷水团边缘区和近岸区,其中冷水团边缘区丰度和生物量最高,冷水团区域次之,近岸区最低;整个冷水团海域小型底栖动物丰度和生物量分别是非冷水团海域的2.3倍和2.1倍。 Abstract:Meiofauna are referred to metazoans, including some protozoans, that can pass through sieves between mesh size of 1 mm (or 0.5 mm) and 0.042 mm (or 0.031 mm). Meiofauna are one of the most important components of the benthic ecosystem and serve as a key link in the benthic food web. They are ubiquitous in nature, with short generation time, small body size and high metabolic rates. Thus their metabolic activity has a direct effect on the rate of matter and nutrient recycling within the benthic ecosystem. Although there are many studies on meiofauna in Chinese seas, such as the Bohai Sea, Yellow Sea and East China Sea, there are only a few reports about meiofauna related to the southern Yellow Sea Cold Water Mass. In this paper, metazoan meiofaunal assemblage, abundance, biomass and spatial distribution in relation to benthic environmental variables at 23 stations in the southern Yellow Sea Cold Water Mass and its adjacent waters in summer 2011 were investigated. The results showed that a total of 20 taxa of meiofauna were identified. The average abundance and biomass of meiofauna were (1194±873) ind./10 cm2 and (881±669) μg dwt./10 cm2, respectively. Free-living marine nematodes were the most dominant meiofaunal group, comprising 89.7% of total abundance and 49.0% of total biomass, followed by benthic copepods (5.5%), crustacean nauplii (1.8%) and polychaetes (1.2%) in terms of abundance, and polychaetes (22.9%), benthic copepods (13.9%), ostracods (7.8%) and tubellarians (2.0%) in terms of biomass. For vertical distribution, 79.1% meiofauna were found in the surface 0-2 cm depth of the sediment, 16.4% in 2-5 cm depth and 4.5% in 5-8 cm depth. The abundance and biomass of total meiofauna showed significant positive correlation with chlorophyll a concentration, while the biomass of the total meiofauna showed significant negative correlation with the concentrations of heavy metals Pb, Cu, Fe, Ni and Co in the sediment and a significant positive correlation with Cd. BIOENV analysis showed that the combination of moisture content, organic matter content and grain size of sediment can best explain the difference of meiofaunal assemblages among the stations. Based on the abundance and biomass of meiofauna, the study area can be divided into three regions, including the centre of cold water mass, area at the perimeter of the cold water mass and the coastal waters. Among the three regions, the abundance and biomass at the perimeter of the cold water mass were the highest, followed by that in the central area of the cold water mass and the coastal water area. The average abundance and biomass of meiofauna in the cold water mass area was 2.3 and 2.1 times of the coastal waters, respectively. 参考文献 相似文献 引证文献