South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China.
Guangdong Center for Marine Development Research, Guangzhou 510220, China.
Sci Total Environ. 2022 Nov 25;849:157627. doi: 10.1016/j.scitotenv.2022.157627. Epub 2022 Jul 28.
To understand zooplankton community changes in the context of climate change and anthropogenic disturbances, we analyzed mesozooplankton samples from four seasons in the subtropical Daya Bay, which is susceptible to perceived disturbances in the South China Sea. The zooplankton community was found to be divided into two clusters, namely the Outer-bay Cluster (OC) comprising Noctiluca scintillans, Temora turbinata, and Paracalanus spp., and the Inner-bay Cluster (IC) which was dominated by Pseudevadne tergestina, Oikopleura rufescens, and Paracalanus spp. The OC was recorded in waters with low Chl a concentrations and high salinity, coinciding with open seawater intrusion. The IC occurred in waters with high Chl a concentrations, low salinity, with terrestrial inputs from the Dan'ao River. The dominant cladoceran species has changed in spring from Penilia avirostris to Pseudevadne tergestina owing to suitable temperature conditions and the low wind speed in this region. Most of the keystone species recorded during all seasons were found to be copepods based on co-occurrence network analysis. Numbers of keystone jellyfish (cnidaria) species, such as Geryonia proboscidalis, Chelophyes contorta, and Aeginura grimaldi were significantly higher in summer than in other seasons due to a low-temperature seawater intrusion, which can result in the highest stability of community structures and affect coastal food webs and fishery resources. Our results highlight that zooplankton community succession may occur with long-term temperature changes in the subtropical Daya Bay under global climate change conditions.
为了理解在气候变化和人为干扰背景下的浮游动物群落变化，我们分析了南海受人为干扰影响较大的亚热带大亚湾四个季节的中型浮游动物样本。浮游动物群落分为两个聚类，即外湾聚类（OC），包含夜光藻、旋口虫和拟哲水蚤属；内湾聚类（IC），主要由中华哲水蚤、红酣海鞘和拟哲水蚤属组成。OC 在外湾聚类中记录到的水体内 Chl a 浓度低、盐度高，与开阔海水入侵有关。IC 出现在 Chl a 浓度高、盐度低、丹灶河陆地输入的水域中。由于该地区温度条件适宜且风速较低，春季优势枝角类物种已从无节幼体变为中华哲水蚤。基于共生网络分析，在所有季节记录到的大多数关键物种都是桡足类。由于低温海水入侵，夏季刺胞动物（腔肠动物）物种（如海月水母、腔肠盘虫和吉氏红酣海鞘）的数量明显高于其他季节，这可能导致群落结构的最高稳定性，并影响沿海食物网和渔业资源。我们的研究结果表明，在全球气候变化条件下，亚热带大亚湾的浮游动物群落可能会随着长期温度变化而发生演替。
