| 摘要: |
| 尖笔帽螺是一种分布广泛的翼足类生物，在食物网与生物地球化学循环中起着重要作用。2020年7月，大亚湾出现高密度尖笔帽螺，给当地生态安全带来潜在风险。文章利用浮游生物成像仪（PlanktonScope），以定点的方式对大亚湾西南海域的环境因子与尖笔帽螺密度进行采样，并对大亚湾高密度尖笔帽螺的分布特征进行研究。结果显示：在水平方向上，尖笔帽螺主要分布于西部湾口及长湾附近海域，其他海域分布相对较少；在垂向上，尖笔帽螺多分布于高温低盐的表层，低温高盐的下层水体分布较少；体长分布方面，湾口西部及其北侧海域尖笔帽螺体长较长，小辣甲西侧、北侧海域尖笔帽螺体长偏短，湾口中部海域体长远小于其他区域。通过分析结果发现，此次大亚湾湾内高密度尖笔帽螺存在随外海海流输入的可能；温盐分布结果表明，尖笔帽螺多出现在海水表层，其垂直分布可能也受海水分层及海流的影响。通过对尖笔帽螺分布特征的归纳与讨论，可以为后续该种生物的进一步溯源提供参考。 |
| 关键词: 大亚湾 尖笔帽螺 分布特征 浮游生物成像仪 水下成像系统 近海生物暴发 |
| DOI：10.11693/hyhz20210400086 |
| 分类号:Q959.2 |
| 基金项目:国家重点研发计划项目,2017YFC1403601号,2020ZLHY0403号,2018YFC1407501号;山东省重大科技创新工程项目,2019JZZY020708号;中国水产科学研究院基本科研业务费项目,2020TD15号。 |
附件 |
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| OUTBURST OF CRESEIS ACICULA IN SOUTHWEST DAYA BAY IN JULY 2020 |
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LIU Dai1, YING Ke-Zhen2, CAI Zhong-Hua1, HUANG Hong-Hui3, BI Hong-Sheng4
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1.Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China;2.Oasis Photobio Tech LTD., Shenzhen 518057, China;3.South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China;4.University of Maryland Center for Environmental Science, Maryland 20688, USA
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| Abstract: |
| Creseis acicula is a widely distributed pteropod and an important link of food web in biogeochemical cycle. In July 2020, high-density C. acicula occurred in the Daya Bay, Hainan, South China Sea, which likely had considerable impact on local food web structure. In this study, an in-situ optical underwater plankton imaging systems, the PlanktonScope was deployed to determine C. acicula density and environmental parameters in the bay. Spatial distribution of C. acicula was investigated. Results show that C. acicula was distributed in greater density mainly in the west bay mouth and Changwan than in other areas. In vertical direction, C. acicula was distributed mainly in the surface layer with higher temperature and lower salinity than those in deeper water columns. The body length of C. acicula was greater in the west bay mouth than those in the north and west area of Xiaolajia, and that in the middle of bay mouth was much shorter than other areas'. Therefore, the high-density C. acicula outburst in Daya Bay might come from an outside source through current. The T-S diagram shows that C. acicula was more likely to appear in the surface water and affected by the stratification of seawater and current. This study provided a reference for further tracing of the species. |
| Key words: Daya Bay Creseis acicula distribution feature PlanktonScope underwater imaging system coastal organism outburst |
