Haptophyte communities along the Kuroshio current reveal their geographical sources and ecological traits
Haptophyte communities along the Kuroshio current reveal their geographical sources and ecological traits
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DOI：
10.1111/mec.16734
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发表时间：
2022-10
影响因子：
4.9
通讯作者：
Hisashi Endo;Y. Umezawa;S. Takeda;Koji Suzuki
中科院分区：
文献类型：
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作者：
Hisashi Endo;Y. Umezawa;S. Takeda;Koji Suzuki
触生植物是现代海洋中生态上最成功的浮游植物类群之一，在各种环境中往往保持平衡和稳定的群落。然而，人们对社区稳定和生态成功的机制知之甚少。为了揭示群落特征和触生植物之间的相互作用，我们从黑潮的上游到下游进行了全面的观测。用定量聚合酶链式反应和18S rRNA序列的MetabarCoding分别对触藻丰度和分类学进行评估。中国东海陆架坡表层浮游植物群落结构发生突变，表明高浮游植物生物量的陆架水域对下游群落有较强的影响。相关网络分析结合系统发育分析表明，触生植物可以与其近亲共存，这可能是由于它们的营养灵活性，从而避免了资源竞争。一些具有高混合营养能力的非钙化触生植物属，如金色蘑菇，构成了共生网络的主要组成部分，而球藻，如Emily iania/Gephy rocapsa，则很少被观察到。我们的研究结果表明，在黑潮生态系统中，非钙化的触生植物在群落多样性和稳定性以及维持食物网络结构方面发挥着至关重要的作用。
Haptophytes are one of the most ecologically successful phytoplankton groups in the modern ocean and tend to maintain balanced and stable communities across various environments. However, little is known about the mechanisms that enable community stability and ecological success. To reveal the community characteristics and interactions among haptophytes, we conducted comprehensive observations from the upstream to downstream regions of the Kuroshio Current. Haptophyte abundance and taxonomy were assessed using quantitative polymerase chain reaction and metabarcoding of 18S rRNA sequences, respectively. The haptophyte community structure changed abruptly at sites on the shelf‐slope of the East China Sea, indicating the strong influence of shelf waters with high phytoplankton biomass on downstream communities. Correlation network analysis combined with the phylogeny suggested that haptophytes can coexist with their close relatives, possibly owing to their nutritional flexibility, thereby escaping from resource competition. Consistently, some noncalcifying haptophyte genera with high mixotrophic capacities such as Chrysochromulina constituted a major component of the co‐occurrence network, whereas coccolithophores such as Emiliania/Gephyrocapsa were rarely observed. Our study findings suggest that noncalcifying haptophytes play crucial roles in community diversity and stability, and in sustaining the food web structure in the Kuroshio ecosystems.