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| 南麂列岛夏季浮游植物群落演替特征及影响因子研究 |
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张喆1, 严小军1, 陈舜1,2, 雷万东3, 谢尚微4, 陈万东4
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1.浙江海洋大学 国家海洋设施养殖工程技术研究中心, 浙江 舟山 316022;2.平阳县科技创新研究院, 浙江 温州 325401;3.国家海洋局温州海洋环境监测中心站, 浙江 温州 325003;4.南麂列岛国家海洋自然保护区管理局, 浙江 温州 325400
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| 摘要: |
| 本研究系统分析了2013—2018年夏季南麂列岛海域浮游植物群落结构特征及环境驱动因素。调查期间共鉴定出浮游植物5门55属116种,其中硅藻门与甲藻门为主要类群。中肋骨条藻(Skeletonema costatum)作为硅藻的代表性优势种,在多数年份占据主导地位。氮磷营养盐对浮游植物群落演替具有关键调控作用,高氮低磷的水环境更利于甲藻生长, 2014年在高氮低磷水体条件下,甲藻细胞丰度占比达54.44%; 2017年相对低氮高磷的水体环境,为中肋骨条藻赤潮发生提供了适宜条件。特殊气候事件对群落结构影响显著,厄尔尼诺/拉尼娜事件通过改变水温、营养盐浓度,导致硅藻与甲藻细胞丰度占比及优势种结构发生明显变化。研究结果表明, 2013—2018年夏季南麂列岛浮游植物群落结构演变受赤潮事件、厄尔尼诺/拉尼娜事件及陆源输入共同作用,溶解氧、悬浮物及氮磷营养盐是影响浮游植物丰度与组成结构的关键环境因子。本研究可为南麂列岛海域生态环境保护及可持续发展提供数据支撑与科学参考。 |
| 关键词: 硅藻 甲藻 群落结构 赤潮 厄尔尼诺 冗余分析 |
| DOI：10.11759/hykx20250817001 |
| 分类号:Q89 |
| 基金项目:国家重点研发计划(2023YFD2401900) |
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| Succession characteristics and influencing factors of the phytoplankton community in Nanji Islands during summer |
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ZHANG Zhe1, YAN Xiaojun1, CHEN Shun1,2, LEI Wandong3, XIE Shangwei4, CHEN Wandong4
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1.National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China;2.Pingyang County Institute of Science and Technology Innovation, Wenzhou 325401, China;3.Wenzhou Marine Environmental Monitoring Central Station, State Oceanic Administration, Wenzhou 325003, China;4.Nanji Islands National Marine Nature Reserve Administration, Wenzhou 325400, China
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| Abstract: |
| This study systematically analyzed the structural characteristics of the phytoplankton community and their environmental drivers in the waters of the Nanji Islands during the summer months from 2013 to 2018. A total of 116 species belonging to 55 genera and 5 phyla were identified, with Bacillariophyta and Dinophyta being the dominant groups. As a representative dominant diatom species, Skeletonema costatum prevailed in most years. Nitrogen and phosphorus nutrients played a key regulatory role in the phytoplankton community succession. High nitrogen and low phosphorus conditions favored the growth of dinoflagellates. In 2014, under such conditions, dinoflagellate abundance accounted for 54.44% of the total community proportion, whereas, in 2017, the relatively low nitrogen and high phosphorus conditions provided a suitable environment for the occurrence of a Skeletonema costatum red tide. Extreme climate events substantially influenced the community structure: El Niño/La Niña events altered the water temperature and nutrient concentrations, which resulted in noticeable changes in the abundance ratios of diatoms to dinoflagellates as well as shifts in the dominant species. These results indicate that the evolution of the summer phytoplankton community structure in the Nanji Islands from 2013 to 2018 was jointly driven by the red tide events, El Niño/La Niña events, and terrestrial inputs. Furthermore, dissolved oxygen, suspended solids, and nitrogen-phosphorus nutrients were identified as the key environmental factors that influence phytoplankton abundance and composition. This study provides data support and scientific references for the ecological protection and sustainable development of the Nanji Islands' marine environment. |
| Key words: diatoms dinoflagellates community structure red tide El Niño redundancy analysis |