Rhythmicity of coastal marine picoeukaryotes, bacteria and archaea despite irregular environmental perturbations
Rhythmicity of coastal marine picoeukaryotes, bacteria and archaea despite irregular environmental perturbations
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DOI：
10.1038/s41396-018-0281-z
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发表时间：
2019-02-01
期刊：
影响因子：
11
通讯作者：
Galand, Pierre E.
中科院分区：
文献类型：
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作者：
Lambert, Stefan;Tragin, Margot;Galand, Pierre E.
海洋微生物的季节性通常在浮游植物的繁殖中观察到，最近在原核生物的群落水平上进行了研究，但很少在单个微生物类群的规模上进行研究。在这里，我们测试特定的海洋真核浮游植物、细菌和古菌类群是否在受不规则环境扰动影响的沿海地区表现出年度节律。我们在巴纽尔斯湾（地中海西北部）进行的为期七年的研究表明，尽管环境条件存在一些波动，但许多微生物类群仍表现出显着的年度节律。在自养生物（超微核生物和蓝细菌）和异养原核生物中都发现了强大的节律性。然而，零星的气象事件和不规则的营养供应确实引发了不太常见的非节律类群的出现。在测量的环境参数中，节律性的主要驱动因素是温度和日照长度。因此，季节性自养生物可能正在为节律性异养生物设定步伐。类似的环境利基也可能推动季节性。观察到的小单胞菌和 SAR11 之间的强烈关联（两者都需要硫胺素前体来生长）可能是第一个迹象，表明共享的营养生态位可以解释一些共现的节律模式。
Seasonality in marine microorganisms has been classically observed in phytoplankton blooms, and more recently studied at the community level in prokaryotes, but rarely investigated at the scale of individual microbial taxa. Here we test if specific marine eukaryotic phytoplankton, bacterial and archaeal taxa display yearly rhythms at a coastal site impacted by irregular environmental perturbations. Our seven-year study in the Bay of Banyuls (North Western Mediterranean Sea) shows that despite some fluctuating environmental conditions, many microbial taxa displayed significant yearly rhythms. The robust rhythmicity was found in both autotrophs (picoeukaryotes and cyanobacteria) and heterotrophic prokaryotes. Sporadic meteorological events and irregular nutrient supplies did, however, trigger the appearance of less common non-rhythmic taxa. Among the environmental parameters that were measured, the main drivers of rhythmicity were temperature and day length. Seasonal autotrophs may thus be setting the pace for rhythmic heterotrophs. Similar environmental niches may be driving seasonality as well. The observed strong association between Micromonas and SAR11, which both need thiamine precursors for growth, could be a first indication that shared nutritional niches may explain some rhythmic patterns of co-occurrence.