Parasitic infections by Group II Syndiniales target selected dinoflagellate host populations within diverse protist assemblages in a model coastal pond
Parasitic infections by Group II Syndiniales target selected dinoflagellate host populations within diverse protist assemblages in a model coastal pond
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II 组 Syndiniales 的寄生虫感染针对模型沿海池塘中不同原生生物组合内选定的甲藻宿主种群
DOI：
10.1111/1462-2920.15977
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发表时间：
2022
影响因子：
5.1
通讯作者：
Edgcomb, Virginia P.
中科院分区：
文献类型：
--
作者：
Sehein, Taylor R.;Gast, Rebecca J.;Pachiadaki, Maria;Guillou, Laure;Edgcomb, Virginia P.
原生生物是海洋食物网和生物地球化学循环的组成部分；然而，对于一些标记基因文库中最丰富的分类群，缺乏描述特定生态位的数据。syndiciales就是这样一个群体，通常代表了从全球海洋中浮游生物样本中恢复的大部分序列。然而，海洋环境中辛迪病的流行和影响尚不清楚。我们开始通过在一个多产的沿海池塘中生成高分辨率时间序列（2018年3月至10月）来解决这些关键的知识差距。在初级生产力较高和夏季温度驱动的分层增加期间，原生生物种群（包括寄生Syndiniales）发生了季节性变化。在7月、8月和9月，感染宿主和自由生活的寄生虫孢子的浓度几乎每个月都会升高。我们认为，在这一时期，强化分层与II群双鞭毛虫寄生的鞭毛虫患病率增加有关。一些原生生物种群的感染与先前报道的大型单分类群鞭毛藻华相当。盐池的感染动态表明，syndinian寄生虫通过混合原生生物组合繁殖，并突出了宿主/寄生虫相互作用的模式，这更好地反映了许多其他海洋环境中不常见的单分类群繁殖。
Protists are integral to marine food webs and biogeochemical cycles; however, there is a paucity of data describing specific ecological niches for some of the most abundant taxa in marker gene libraries. Syndiniales are one such group, often representing the majority of sequence reads recovered from picoplankton samples across the global ocean. However, the prevalence and impacts of syndinian parasitism in marine environments remain unclear. We began to address these critical knowledge gaps by generating a high‐resolution time series (March–October 2018) in a productive coastal pond. Seasonal shifts in protist populations, including parasitic Syndiniales, were documented during periods of higher primary productivity and increased summer temperature‐driven stratification. Elevated concentrations of infected hosts and free‐living parasite spores occurred at nearly monthly intervals in July, August, and September. We suggest intensifying stratification during this period correlated with the increased prevalence of dinoflagellates that were parasitized by Group II Syndiniales. Infections in some protist populations were comparable to previously reported large single‐taxon dinoflagellate blooms. Infection dynamics in Salt Pond demonstrated the propagation of syndinian parasites through mixed protist assemblages and highlighted patterns of host/parasite interactions that better reflect many other marine environments where single taxon blooms are uncommon.