Rhizaria in the oligotrophic ocean exhibit clear temporal and vertical variability

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
Alex Barth , Leocadio Blanco-Bercial , Rod Johnson , Joshua Stone
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引用次数: 0

Abstract

Recently studies have shown that Rhizaria, a super-group of marine protists, have a large role in pelagic ecosystems. They are unique in that they construct mineral tests out of silica, calcium carbonate, or strontium sulfate. As a consequence, Rhizaria can have large impacts on the ocean’s cycling of carbon and other elements. However, less is known about Rhizaria ecology or their role in the pelagic food-web. Some taxa, like certain Radiolarians, are mixotrophic, hosting algal symbionts. While other taxa are flux-feeders or even predatory carnivores. Some prior research has suggested that Rhizaria will partition vertically in the water column, likely due to different trophic strategies. However, very few studies have investigated their populations over extended periods of time. In this study, we present data investigating Rhizaria abundance and vertical distribution from over a year of monthly cruises in the Sargasso Sea. This study represents the first quantification of Rhizaria throughout the mesopelagic zone in an oligotrophic system for an extended period of time. We use this data to investigate the hypothesis that Rhizaria taxonomic groups will partition due to trophic mode. We also investigate how their abundance varies in accordance with environmental parameters. Rhizaria abundance was quantified using an Underwater Vision Profiler (UVP5), an in-situ imaging device. Ultimately, we show that different Rhizaria taxa will have unique vertical distribution patterns. Models relating their abundance to environmental parameters have mixed results, yet particle concentration is a common predictive variable, supporting the importance of heterotrophy amongst many taxa.

寡营养海洋中的根瘤菌表现出明显的时间和垂直变异性
最近的研究表明,根瘤菌是海洋原生动物的一个超级类群,在浮游生态系统中发挥着重要作用。它们的独特之处在于能用二氧化硅、碳酸钙或硫酸锶构建矿物试验。因此,根瘤菌对海洋中碳和其他元素的循环有很大影响。然而,人们对根瘤菌的生态学及其在浮游食物网中的作用却知之甚少。有些类群,如某些放射虫,是混养型的,寄生于藻类共生体。而其他类群则是通量摄食者,甚至是捕食性食肉动物。之前的一些研究表明,根瘤菌会在水体中垂直分区,这可能是由于不同的营养策略造成的。然而,很少有研究对其种群进行长时间的调查。在本研究中,我们展示了在马尾藻海一年多的月度巡航中调查根瘤菌丰度和垂直分布的数据。这项研究首次对低营养系统中层水区的根瘤菌进行了长时间的量化研究。我们利用这些数据研究了根瘤菌分类群会因营养模式而分化的假设。我们还研究了它们的丰度如何随环境参数而变化。我们使用水下视觉剖面仪(UVP5)(一种现场成像设备)对根瘤菌的丰度进行了量化。最终,我们发现不同的根瘤菌类群会有独特的垂直分布模式。将它们的丰度与环境参数相关联的模型结果不一,但颗粒浓度是一个常见的预测变量,支持了许多分类群之间异养的重要性。
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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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