| LIU Xiaoshou,XU Man,ZHANG Jinghuai,LIU Dan,LI Xiao. 2015. Community structure and biodiversity of free-living marine nematodes in the northern South China Sea. Acta Oceanologica Sinica, 34(6):77－85 |
| Community structure and biodiversity of free-living marine nematodes in the northern South China Sea |
| 南海北部自由生活海洋线虫的群落结构和生物多样性 |
| Received:July 07, 2014 Revised:September 21, 2014 |
| DOI：10.1007/s13131-014-0549-8 |
| Key words:free-living marine nematodes community structure biodiversity deep sea northern South China Sea |
| 中文关键词: 自由生活海洋线虫 群落结构 生物多样性 深海 南海北部 |
| 基金项目:The Fundamental Research Funds for Central Universities of the Ministry of Education of China from Ocean University of China under contract Nos 201362018 and 201462008; the National Natural Science Foundation of China under contract No. 41006081; the Scientific Research Award Foundation for Outstanding Middle-aged and Young Scientists of Shandong Province under contract No. BS2013HZ008. |
| Author Name | Affiliation | E-mail | | LIU Xiaoshou | Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China
College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China | liuxs@ouc.edu.cn | | XU Man | College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China | | | ZHANG Jinghuai | South China Sea Environmental Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | | | LIU Dan | College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China | | | LI Xiao | College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China | |
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| Abstract: |
| A quantitative study on the community structure and biodiversity of free-living marine nematodes and their relationship with environmental factors in the northern South China Sea were carried out based on the samples collected at five stations in the deep sea (from 313 to 1 600 m) and one station in shallow waters (87 m) during the cruise in September, 2010. Results showed that the abundance of marine nematodes ranged from 224 to 1 996 ind./(10 cm2). A total of 69 free-living marine nematode genera, belonging to 26 families and three orders, were identified. The most dominant genera were Sabatieria, Linhystera, Aegialoalaimus and Daptonema according to SIMPER analysis. Results of CLUSTER analysis revealed four types of marine nematode community (or station groups) in the sampling area. In terms of trophic structure, non-selective deposit feeders (1B) and selective deposit feeders (1A) were the dominant trophic types with highest genera numbers and abundances, which implied that organic detritus was the main food source of marine nematodes in the northern South China Sea. The percentage of male nematode was low, ranging from 2.22% to 17.81%, while those of juvenile individuals ranged from 36.99% to 82.09%. For genera level diversity of marine nematodes, Shannon-Wiener diversity indices (H') ranged from 3.76 to 4.57 and had highly significant negative correlation with water depth. In general, diversity indices H' at the five stations in deep sea (over 200 m) were lower than that at the station in shallow waters (87 m). BIOENV analysis showed that the most important environmental factor controlling marine nematode communities was water depth. |
| 中文摘要: |
| 利用2010年9月在南海北部海域5个深海站位(水深313-1600m)和1个浅海站位(水深87m)采集的沉积物样品,对自由生活海洋线虫的群落结构和生物多样性及其与环境因子的关系进行了定量研究。结果表明,海洋线虫的丰度为224-1996 ind./(10 cm2)。共鉴定出海洋线虫69个属,属于26个科、3个目。SIMPER分析表明,Sabatieria、Linhystera、Aegialoalaimus和Daptonema是最优势的属。CLUSTER聚类分析将采样区域的海洋线虫群落划分为4种类型(或站组)。在营养结构方面,非选择性沉积食性者(1B)和选择性沉积食性者(1A)是最优势的营养类型,具有最高的属数和丰度,这表明有机碎屑是南海北部海域海洋线虫的主要食物来源。雄性线虫的比例较低,为2.22-17.81%,而幼体比例为36.99-82.09%。在属水平上,香农-威纳多样性指数(H')为3.76-4.57,并且与水深具有极显著的负相关。总体上,在水深大于200m的5个站位的H'值低于浅海站位(水深87m)的H'值。BIOENV分析表明,影响海洋线虫群落结构的最重要的环境因子是水深。 |
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