| 摘要: |
| 近年来,海月水母在我国沿海大量出现,其水螅体横裂生殖是种群扩增的关键环节,对种群数量变动具有重要影响,温度为该过程的核心调控因子。现有研究多采用静态或简单阶梯式温度处理,难以反映动态变化下的横裂生殖特征。本研究以2018–2020年渤海辽东湾红沿河近岸海域春季至夏季逐日水温为依据,设置三个温度动态变化处理组,通过室内受控实验,模拟野外实际温度日变化过程,量化温度波动特征,分析自然温度波动对海月水母水螅体横裂生殖过程及碟状体释放量的影响。研究结果表明,温度波动幅度大的2020年处理组水螅体横裂启动较早,进入横裂期释放碟状体速率最快。温度波动特征(标准差、绝对温度变化率、波动频次和升温速率)显著影响碟状体释放总量,其中2018年温度波动最大,碟状体释放量最多；2020年温度波动次之,但仍处于较高水平,碟状体释放量次高；而2019年温度相对平稳,碟状体释放量最少。根据本实验结果,红沿河近岸海域海月水母水螅体横裂生殖活跃的温度范围为12–16 ℃,与该海域野外采集到碟状体的水温区间一致,碟状体出现集中在15-18 ℃,20-25 ℃碟状体释放速度减缓。本研究揭示了温度波动对海月水母横裂生殖过程的影响,为深入理解水母灾害发生机制、提高水母灾害预测能力提供科学依据。 |
| 关键词: 海月水母 温度日变化 横裂生殖 碟状体释放量 红沿河近岸海域 |
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| EFFECTS OF SPRING–SUMMER DAILY TEMPERATURE VARIATIONS ON STROBILATION OF THE MOON JELLYFISH AURELIA COERULEA |
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liutingting1, zhangjing1, guodongjie2, xuboya2, jinxin2, wangnan2, zhangfang2
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1.Tianjin University of Science and Technology;2.Institute of Oceanology, Chinese Academy of Sciences
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| Abstract: |
| In recent years, the moon jellyfish (Aurelia coerulea) has appeared in large numbers along the coasts of China. Strobilation of polyps is a key link in population proliferation and plays an important role in population dynamics, with temperature serving as a core regulatory factor in this process. Studies often employ static or simple stepwise temperature treatments, which cannot reflect characteristics of strobilation under dynamic variations. Based on daily seawater temperature data from the Hongyanhe coastal area during spring and summer from 2018 to 2020, this study established three treatment groups with dynamic temperature changes. Through laboratory experiments simulating actual daily temperature fluctuations in the field, the temperature fluctuation characteristics and analyzed the effects of natural temperature variations on the strobilation process and ephyrae release of A. coerulea polyps were quantified. The results showed that polyps in the 2020 treatment group initiated strobilation earlier and exhibited a faster ephyra release rate upon entering the strobilation stage. Temperature fluctuation characteristics (standard deviation, absolute temperature change rate, fluctuation frequency and heating rate) significantly affected the total number of ephyrae released. Among the three years, the 2018 treatment group exhibited the highest temperature fluctuation frequency and the largest number of ephyrae released, followed by the 2020 treatment group which also had a relatively high fluctuation frequency and the second highest ephyra release, whereas the 2019 treatment group had relatively stable temperatures and the lowest ephyra release. The active temperature range for strobilation of A. coerulea polyps in the Hongyanhe coastal area was 12–16 ℃, with ephyrae release concentrated at 15–18 ℃, ephyra release rate decreasing at 20–25 ℃. This study reveals the effects of temperature fluctuations on the strobilation process of the moon jellyfish, providing scientific basis for understanding the mechanisms underlying jellyfish blooms and improving the capacity for jellyfish bloom prediction. |
| Key words: Aurelia coerulea daily temperature variation strobilation ephyrae release Hongyanhe coastal area |