| 摘要: |
| 根据2007—2011年每年春季在珠江口中东部水域6个站位的调查数据, 对该水域的水母种类组成及其数量变化进行了研究。结果表明: 调查水域春季水母种类组成上以软水母为主, 总种类数在2007—2009年略有下降(平均为13种), 2010年下降明显, 仅为7种, 而2011年大幅增至18种。软水母和栉水母在水母总丰度中占有较大比例, 2007—2010年水母平均丰度为91.77ind/m3, 2011 年水母数量急剧上升, 高达1185.07ind/m3, 其中河口半咸淡水种弗洲指突水母(Blackfordia virginica)和近岸暖水种球型侧腕水母(Pleurobrachia globosa)增加尤为明显; 浮游动物总丰度中水母所占比例从2007年的0.5%上升至2011年的51.1%。地理分布上, 水母密集区主要位于调查区域的中北部; 环境因素如表层叶绿素a、桡足类丰度、地形和潮汐等对水母的集群现象有影响。 |
| 关键词: 珠江口, 水母, 种类组成, 数量分布 |
| DOI：10.11693/hyhz201203027027 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)项目, 2011CB403604 号; 海洋公益性行业科研专项, 201005018 号 |
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| ECOLOGICAL STUDIES ON THE MEDUSAE IN THE MID-EASTERN PEARL RIVER ESTUARY DURING THE SPRINGS OF 2007—2011 |
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GUO Dong-Hui1,2, LI Gang3, HE Jing1
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1.College of Ocean & Earth Sciences, Xiamen University;2.State Key Laboratory of Marine Environmental Science;3.Shenzhen Key Laboratory for Coastal and Atmospheric Research
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| Abstract: |
| Based on the data of ecological survey in the mid—eastern Pearl River estuary during the springs of 20077—2011, the results showed that: The dominant species of medusa were belonged to Leptomedusa, the species number of medusa slightly declined during 2007—2009, but decreased significantly in 2010, and sharply increased to 18 species in 2011. The average abundance of medusa was 91.77ind/m3 during the springs of 2007—2010, while it dramatically increased to 1185.07ind/m3 in 2011, which is dominated with estuarine species Blackfordia virginica and warm water species Pleurobrachia globosa. The relative abundance of medusa was increased from 0.5% in 2007 to 51.1% in 2011. Medusa mainly aggregated in the upper part of the survey area. The environmental factors that influenced the aggregation of me-dusa were surface chlorophyll a, copepod abundance, topography and tidal. |
| Key words: Pearl River estuary, Medusa, Species composition, Abundance distribution |
