College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China.
College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China; Marine Engineering Research and Development Center of Jinjiang Science and Education Park, Fuzhou University, Fuzhou 350108, China.
Mar Pollut Bull. 2024 Nov;208:117059. doi: 10.1016/j.marpolbul.2024.117059. Epub 2024 Oct 3.
Dinoflagellate blooms have negative adverse effects on marine ecosystems. However, our knowledge about the spatiotemporal distribution of dinoflagellate communities and their correlations with micro-eukaryotic and bacterial communities is still rare. Here, the sediment micro-eukaryotic and bacterial communities were explored in the Taiwan Strait (TWS) by 16S and 18S rRNA gene high-throughput sequencing. We found that the dinoflagellates were the most abundant algal group in TWS, and their relative abundance was higher in spring and autumn than in summer. Moreover, the species richness and community composition of dinoflagellates showed strong seasonal patterns. NO-N and NH-N had the strongest correlations with the spatiotemporal dynamics of community composition of dinoflagellates. The dinoflagellates had a significantly wider niche breadth than other algal groups for NH-N, NO-N and NO-N, and therefore potentially contributed to a wider distribution range and high abundance in TWS. In addition, the dinoflagellates had stronger impacts on microeukaryotes than on bacteria for both community composition and species richness. However, the dinoflagellates showed close coexistence with bacteria but loose coexistence with microeukaryotes in spring co-occurrence networks. This close coexistence suggests the potentially strong synergy effects between dinoflagellates and bacteria in spring dinoflagellate blooms in TWS. Overall, this study revealed the distribution mechanisms of dinoflagellates in TWS based on niche breadth and also unveiled the different effects of dinoflagellates on micro-eukaryotic and bacterial communities.
甲藻水华对海洋生态系统有负面影响。然而，我们对甲藻群落的时空分布及其与微真核生物和细菌群落的相关性的了解仍然很少。本研究通过 16S 和 18S rRNA 基因高通量测序，探讨了台湾海峡（TWS）的沉积物微真核生物和细菌群落。结果表明，甲藻是 TWS 中最丰富的藻类群，其相对丰度在春季和秋季高于夏季。此外，甲藻的物种丰富度和群落组成表现出强烈的季节性模式。NO-N 和 NH-N 与甲藻群落组成的时空动态具有最强的相关性。甲藻对 NH-N、NO-N 和 NO-N 的生态位宽度明显大于其他藻类群，因此可能有助于其在 TWS 中分布范围更广、丰度更高。此外，甲藻对微真核生物的群落组成和物种丰富度的影响大于对细菌的影响。然而，在春季共现网络中，甲藻与细菌紧密共存，而与微真核生物松散共存。这种紧密共存表明，在 TWS 的春季甲藻水华期间，甲藻和细菌之间可能存在强烈的协同作用。总之，本研究揭示了基于生态位宽度的 TWS 中甲藻的分布机制，并揭示了甲藻对微真核生物和细菌群落的不同影响。
