| Zuo Tao,Liu Hui. 2019. Seasonal size composition and abundance distribution of Euphausia pacifica in relation to environmental factors in the southern Yellow Sea. Acta Oceanologica Sinica, 38(2):70－77 |
| Seasonal size composition and abundance distribution of Euphausia pacifica in relation to environmental factors in the southern Yellow Sea |
| 黄海中部太平洋磷虾的大小组成和丰度分布的季节变化及其与环境因子的关系 |
| Received:May 12, 2018 |
| DOI：10.1007/s13131-019-1358-x |
| Key words:spatial distribution size composition biomass Euphausia pacifica Yellow Sea |
| 中文关键词: 空间分布 大小组成 生物量 太平洋磷虾 黄海 |
| 基金项目:The NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No. U1606404; the National Natural Science Foundation of China under contract No. 40976103; the Ministry of Science and Technology of China under contract No. 2011CB403604. |
| Author Name | Affiliation | E-mail | | Zuo Tao | Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China | zuotao@ysfri.ac.cn | | Liu Hui | Department of Marine Biology, Texas A & M University at Galveston, Galveston, TX 77553, USA | |
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| Abstract: |
| The seasonal size structure and spatial abundance distributions of Euphausia pacifica populations were investigated in the central part of southern Yellow Sea from August 2009 to May 2010. The abundance and biomass of E. pacifica were higher in spring and summer, and lower in autumn and winter. The mean abundance and biomass (calculated by carbon) were 74.94 ind./m3 and 8.23 mg/m3, respectively. Females with total length (TL) ranging between 10 and 19 mm in summer had a substantial contribution to the population biomass, whereas larvae of TL of 3-7 mm in spring were the main contributor to the population abundance. The sex ratio (female:male) showed a female bias in four seasons. Its value peaked in summer, and then decreased in autumn, spring, and winter successively. Cohort analysis revealed that the length-frequency distribution of E. pacifica could be characterized as one group with large animals (mean TL>12 mm) accompanied by one or two subgroups of small individuals (mean TL<7 mm). Regarding the spatial distribution, juveniles and adults of E. pacifica tend to concentrate in relatively deep water with low temperature (~11℃) and high salinity (>32), whereas its larvae showed more abundance in inshore water with rich chlorophyll a, low salinity (<32), and warm temperature (>11℃), especially in summer and autumn. Associations changed seasonally between stage-specific abundance and environmental factors. |
| 中文摘要: |
| 基于2009年8月至2010年5月四季调查资料，研究黄海中部的太平洋磷虾个体大小组成和丰度的空间分布季节变化。结果显示，太平洋磷虾的丰度和生物量在春季和夏季较高，秋、冬季较低，平均丰度和生物量（以碳计）分别为74.94 ind./m3和8.23 mg/m3。夏季体长介于10-19mm的雌体是种群总生物量的主要贡献者，而春季体长介于3-4mm的幼体是种群总丰度的主要贡献者。四个季节中，太平洋磷虾的成体都以雌性个体占主导；雌：雄性比值以夏季最高，之后随秋、春、冬季依次降低。体长-频数分析显示，太平洋磷虾种群可分为两个体长分布同生群，分别为平均体长>12mm的较大个体组群和平均体长<7mm的较小个体组群。丰度空间分布显示，太平洋磷虾未成体和成体多聚集于相对深水区，此区相对低温和高盐；幼体多分布于较浅的近岸区，特别是在夏秋季，此区叶绿素和水温较高，盐度较低。各发育期的个体丰度分布与环境因子间的相关关系具有季节变化。 |
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