Characteristics of zooplankton community and its influencing factors in the Tieshan Bay, Beibu Gulf of the South China Sea
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摘要: 为探究北部湾铁山港海域浮游动物群落结构特征及变化规律,根据2018年4月(春季)、7月(夏季)、10月(秋季)和2022年7月(夏季)的航次数据,分析了浮游动物的丰度、生物量、种类组成、优势种及其与环境因子的关系。研究海域共鉴定出浮游动物162种(类)。2018年浮游动物丰度和生物量表现为夏季(274.58 ± 221.15 ind./m3,152.09 ± 142.97 mg/m3)高于秋季(215.72 ± 114.81 ind./m3,87.65 ± 46.70 mg/m3)高于春季(193.75 ± 185.81 ind./m3,60.95 ± 47.96 mg/m3)的季节特征。优势种共15种,优势种组成有明显的季节变化。春季优势种有大西洋五角水母(Muggiaea atlantica)和软拟海樽(Dolioletta gegenbauri)等外海种;球型侧腕水母(Pleurobrachia globosa)仅在夏季为优势种,秋季占据主导地位的是太平洋纺锤水蚤(Acartia pacifica)和锥形宽水蚤(Temora turbinata)等近岸暖水种。对比2018年夏季,2022年夏季温度和叶绿素a浓度升高,使得水母类在浮游动物群落结构中的占比增加。铁山港海域浮游动物群落结构季节间差异和年际差异主要受温度、盐度、和叶绿素a浓度的影响。研究还表明,铁山港海域浮游动物群落结构趋于小型化,群落稳定性较差。Abstract: To explore the characteristics and changes of zooplankton community structure in Tieshan Bay area of the Beibu Gulf, the abundance, biomass, species composition, dominant species and their relationship with environmental factors were analyzed based on the investigation conducted during April 2018 (spring), July 2018 (summer), October 2018 (autumn) and July 2022 (summer). A total of 162 species (classes) of zooplankton were identified. In 2018, the abundance and biomass of zooplankton were higher in summer (274.58 ± 221.15 ind./m3, 152.09 ± 142.97 mg/m3), higher than in autumn (215.72 ± 114.81 ind./m3, 87.65 ± 46.70 mg/m3), and higher than in spring (193.75 ± 185.81 ind./m3, 60.95 ± 47.96 mg/m3). There were 15 dominant species. The dominant species had obvious seasonal variation. In spring, the dominant species were offshore species such as Muggiaea atlantica and Dolioletta gegenbauri. Pleurobrachia globosa was dominant species only in summer. Nearshore warm-water species such as Acartia pacifica and Temora turbinata dominated in autumn. Compared with the summer of 2018, the temperature and chlorophyll a concentration in the summer of 2022 increased, which increased the proportion of jellyfish in the zooplankton community structure. The seasonal and interannual differences of zooplankton community structure in Tieshan Bay were mainly affected by temperature, salinity and Chla concentration. The study also shows that the community structure of zooplankton tends to be miniaturized and the community stability is poor.
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Key words:
- zooplankton /
- community structure /
- environmental factors /
- seasonal variation /
- Tieshan Bay
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图 8 优势种与环境参数的RDA分析
注:Chla: 叶绿素a浓度;Do:溶解氧含量;Tem: 温度;Tr: 透明度;Sal:盐度;DIN: 溶解无机氮;DIP: 溶解无机磷; Si: 活性硅酸盐
Fig. 8 Redundancy analysis (RDA) results of dominant species and environmental parameters
Notes: Chla: Chlorophyll a concentration; DO: Dissolved oxygen; Tem:Temperature; Tr: Transparency; Sal: Salinity; DIN: Dissolved inorganic nitrogen; DIP: Dissolved inorganic phosphorus; Si: Soluble reactive silicate
图 10 2018年和2022年夏季浮游动物主要类群与环境因素的RDA分析
注:绿色方形代表2018年夏季站位,黄色圆形代表2022年夏季站位
Fig. 10 Redundancy analysis (RDA) results of major zooplankton groups and environmental factors in summer of 2018 and 2022
Notes: The green square represents the stations in summer 2018 and the yellow circle represents the stations in summer 2022.
表 1 铁山港浮游动物的种类组成和相对丰度(%)
Tab. 1 Species composition and relative abundance (%) of zooplankton in Tieshan Bay
类群
Taxa春季 夏季 秋季 2022夏季 种类 相对丰度(%) 种类 相对丰度(%) 种类 相对丰度(%) 种类 相对丰度(%) 水螅水母类 Hydromedusae 15 8.61 8 1.05 15 2.01 16 1.29 管水母类 Siphonophorae 2 6.95 / / / / / / 钵水母类 Scyphozoa / / 1 0.09 / / 1 0.04 栉水母类 Ctenophores 1 0.04 1 4.19 1 0.43 1 7.15 浮游多毛类 Polychaeta 1 0.29 1 0.04 / / / / 腹足类 Gastropoda 2 0.16 / / 3 0.51 / / 枝角类 Cladocera 1 0.18 1 2.39 2 3.49 2 0.97 介形类 Ostracoda 1 0.88 1 0.13 1 3.26 / / 桡足类 Copepoda 23 6.13 24 25.72 36 38.89 19 21.64 端足类 Amphipoda / / / / 1 0.01 2 0.10 樱虾类 Decapoda 1 0.27 / 5.27 3 8.30 2 14.11 等足类 Isopoda 1 0.14 / / / / / / 歪尾类 Anomura / / / / / / 1 0.07 糠虾类 Mysids 1 0.04 / / 1 0.07 / / 毛颚类 Chaetognatha 7 2.39 7 7.71 11 13.64 10 10.90 被囊类 Tunicata 3 4.48 1 0.49 1 0.36 2 0.09 浮游幼虫类 Planktonic larvae 14 69.43 15 52.91 14 29.03 17 43.65 总计 Total 73 100.00 60 100.00 89 100.00 73 100.00 注:“/”表示该类群未出现 表 2 铁山港浮游动物优势种的丰度(ind./m3)和优势度(Y)
Tab. 2 Abundance (ind./m3) and dominance (Y) of dominant species of zooplankton in Tieshan Bay
优势种 2018年春季 2018年夏季 2018年秋季 2022年夏季 平均丰度
/(ind./m3)优势度 平均丰度
/(ind./m3)优势度 平均丰度
/(ind./m3)优势度 平均丰度
/(ind./m3)优势度 大腺拟杯水母 Phialella macrogona 3.89 ± 7.43 0.02 — — — — — — 双生水母 Diphyes chamissonis 6.88 ± 14.91 0.04 — — — — — — 大西洋五角水母 Muggiaea atlantica 6.59 ± 15.49 0.05 — — — — — — 软拟海樽 Dolioletta gegenbauri 7.70 ± 15.46 0.04 — — — — — — 球型侧腕水母 Pleurobrachia globosa — — 11.51 ± 18.08 0.08 — — 28.51 ± 60.25 0.06 肥胖三角溞 Pseudevadne tergestina — — 6.57 ± 11.71 0.03 — — — — 太平洋纺锤水蚤 Acartia pacifica — — 29.43 ± 59.36 0.15 22.27 ± 40.30 0.11 41.12 ± 60.21 0.12 强额孔雀哲水蚤 Pavocalanus crassirostris — — 5.41 ± 9.82 0.03 — — 亚强次真哲水蚤 Subeucalanus subcrassus — — 13.25 ± 24.48 0.06 7.81 ± 9.91 0.04 — — 锥形宽水蚤 Temora turbinata — — 7.59 ± 10.10 0.03 19.26 ± 34.41 0.09 — — 亨生莹虾 Lucifer hanseni — — 13.05 ± 28.78 0.04 14.20 ± 21.39 0.05 43.66 ± 44.07 0.13 肥胖箭虫 Flaccisagitta enflata — — 13.88 ± 24.59 0.07 20.68 ± 33.29 0.14 30.35 ± 44.28 0.08 瘦形歪水蚤 Tortanus gracilis — — — — 6.45 ± 9.49 0.03 — — 红纺锤水蚤 Acartia erythraeus — — — — — — 12.06 ± 17.04 0.03 针刺真浮萤 Euconchoecia aculeata — — — — 7.03 ± 12.03 0.02 — — 注: “—”:物种在对应季节不是优势种 表 3 浮游动物群落结构差异的累积贡献度分析
Tab. 3 Analysis of the cumulative contribution of differences in zooplankton community structure
种类 平均不相似性 累计贡献度(%) 2018年春季和
2018年秋季肥胖软箭虫 0.73 19.0 太平洋纺锤水蚤 0.71 25.3 锥形宽水蚤 0.68 42.3 亨生莹虾 0.65 55.9 亚强次真哲水蚤 0.76 58.4 2018年春季和
2022年夏季亨生莹虾 0.93 34.3 太平洋纺锤水蚤 0.66 41.6 球形侧腕水母 0.34 48.7 肥胖软箭虫 0.82 54.5 中型莹虾 0.35 67.0 表 4 铁山港海域浮游动物群落与其它海湾的比较
Tab. 4 Comparisons of zooplankton between the Tieshan Bay and other coastal embayments
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