| 摘要: |
| 采用现场调查和实验室分选的方法，对在南海东北部海域（2017年8月）采集的7个站位点的小型底栖生物沉积物样品进行了分选分析研究。通过对样品的类群组成、丰度、生物量以及空间分布等方面的分析结果表明，南海东北部海域7个站位点小型底栖动物的平均丰度为（224.3±52）ind./10cm2，分选出小型底栖动物三个大类群，其中线虫占整个小型底栖生物总丰度的95.7%，其次为底栖桡足类（4.1%），多毛类（0.2%）。本次研究中线虫的平均个体干质量为0.15μg/个；在生物量上，线虫为（32.2±12.96）μg/10cm2，占小型底栖生物总生物量的58.7%。垂直分布上65.7%的小型底栖动物以及其中最优势的线虫（64.8%）都分布在沉积物表层0-2cm处。本航次样品中共鉴定出海洋线虫293种或分类实体，隶属于105属，26科，4目，其中发现并描述了2个新种和5个新纪录。主要优势属有Halalaimus、Sabatieria、Cervonema、Molgolaimus和Acantholaimus等。在摄食类型上，沉积食性者（1A+1B）占优势（物种数占70.3%，个体数占72%）；雌雄比例为1︰0.45，幼龄个体占线虫群落个体总数的32.5%。通过分析研究小型底栖动物各个类群的丰度和生物量以及与其他海域相关研究进行对比，结果显示，南海相较其他海域整体丰度偏低。就目前已有的南海相关研究资料中，本文研究的南海东北部海域的丰度也偏低；南海东北部海域的研究为南海小型底栖生态学研究补充数据，为以后我国线虫的研究提供基础资料。 |
| 关键词: 小型底栖动物 自由生活海洋线虫 底栖生态学 南海东北部 |
| DOI：10.11693/hyhz20191100216 |
| 分类号:Q19 |
| 基金项目:国家自然科学基金资助项目，41676146号。 |
附件 |
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| STUDY ON SUMMER MEIOFAUNA IN THE NORTHEASTERN SOUTH CHINA SEA |
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JIA Su-Su, QIAO Chun-Yan, HUANG Yong
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College of Life Sciences, Liaocheng University, Liaocheng 252000, China
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| Abstract: |
| Meiobenthos were sampled in seven stations in the northeastern part of the South China Sea in August 2017. The group composition, abundance, biomass and spatial distribution were analyzed. Three small benthic groups, i.e., Nematode, Copepod and Polychaete, were selected in the seven stations. Results show that the average abundance of small benthic animals were (224.3±52)ind./10cm2. Nematode accounted for 95.7% of the total abundance of all meiofauna, followed by Copepod (4.1%) and Polychaete (0.2%). The average individual dry mass of nematode was 0.15μg. The biomass of Nematode was (32.2±12.96)ind./10cm2, accounting for 58.7%. About 65.7% of the meiofauna, including dominant nematodes (64.8%), were found in the top 0-2cm sediment. In total, 293 species were identified, belonging to 105 genera, 26 families, and 4 orders, including 2 new species and 5 new records. The major dominant genera were Halalaimus, Sabatieria, Cervonema, Molgolaimus, and Acantholaimus. In feeding type, the deposit feeders (1A+1B) were the dominants (70.3% of species and 72% of individuals). The average ratio of males to females was 1︰0.45, and the young individuals accounted for 32.5% of the total population of nematodes. In addition, the abundance and biomass of various groups of meiofauna were analyzed and compared with the cases of other sea areas. It was found that the overall abundance of meiobenthos in the South China Sea was low, and was even lower in the northeastern part of the South China Sea. This study enriched the data of small benthic ecology in the South China Sea for future studies on nematodes in China. |
| Key words: meiofauna marine nematode benthic ecology northeastern South China Sea |
