New clade of silicified bolidophytes that belong to <i>Triparma</i> (Bolidophyceae, Stramenopiles)

Yamada, Kazumasa; Sato, Shinya; Yamazaki, Masashi; Kuwata, Akira; Ichinomiya, Mutsuo

doi:10.1111/pre.12413

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Two small photosynthetic protists were also recorded as indicators of Churchill River coastal waters: the Prymnesiophyceae Chyrsochromulina sp., a mixotrophic taxon reported in highly stratified or ice melt-freshened waters in the Arctic (Comeau et al, 2013;Lovejoy, 2014;Ardyna et al, 2017), and a Parmales (bolidophyte), with match closest to T. strigata (99.5%) and environmental sequences including those from the Arctic (Terrado et al, 2013). Non-silicious bolidophytes are reported to be mixotrophic, consuming bacteria (Piwosz et al, 2013), but whether the OTU represented a flagellate or silicified form cannot be stated without confirmation by electron microscopy (Yamada et al, 2020). In summary, following ice breakup about 1 month earlier (beginning of June 2018), most of the indicator species off the Churchill estuary were associated with postbloom conditions with increasing surface temperature, remaining mobile sea ice and low inorganic nutrients concentrations in the area at the time of sampling (July 4, 2018).…”

Section: Coastal Communities As An Indicator Of Regional Conditionsmentioning

confidence: 99%

Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)

Jacquemot

Kalenitchenko

Matthes

et al. 2021

Elementa: Science of the Anthropocene

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One of the most striking ecological divides on Earth is between marine and nearby freshwater environments, as relatively few taxa can move between the two. Microbial eukaryotes contribute to biogeochemical and energy cycling in both fresh and marine waters, with little species overlap between the two ecosystems. Arctic and sub-Arctic marine systems are relatively fresh compared to tropical and temperate systems, but details of microbial eukaryote communities along river-to-sea transitions are poorly known. To bridge this knowledge gap, we investigated three river-to-sea transitions (Nelson, Churchill, and Great Whale Rivers) in sub-Arctic Hudson Bay through 18S rRNA amplicon sequencing to identify microbial eukaryotes along the salinity and biogeochemical gradients. Salinity acted as the principal dispersal barrier preventing freshwater microorganisms from colonizing marine coastal waters, with microbial eukaryote communities of the three rivers clustering together. Just offshore, communities clustered by coastal regions associated with nutrient concentrations. Analysis of indicator species revealed that communities in the nitrate-depleted coastal water off the Churchill and Great Whale Rivers were dominated by heterotrophic taxa and small photosynthetic protists. In contrast, the Nelson offshore community was characterized by a high proportion of the diatom Rhizosolenia. A distinct community of heterotrophic protists was identified in the three estuarine transition zones, suggesting specialized estuarine communities. Such specialization was most marked in the Nelson River system that was sampled more intensely and showed estuarine circulation. The autochthonous community was composed of the bacterial grazers Katablepharis, Mataza, and Cryothecomonas, as well as brackish species of the diatoms Skeletonema and Thalassiosira. These findings suggest that flow regulation on the Nelson River that modifies estuarine circulation would affect estuarine community composition and distribution in the transition zone.

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Section: Coastal Communities As An Indicator Of Regional Conditionsmentioning

confidence: 99%

Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)

Jacquemot

Kalenitchenko

Matthes

et al. 2021

Elementa: Science of the Anthropocene

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“…Consequently, the order Parmales was re-established under the class Bolidophyceae (Ichinomiya et al, 2016). The two forms have a phylogenetically nested relationship, and the silicified strains possess the genomic potential to form flagella, suggesting that these two forms represent different stages in the life cycle of the same organisms (Ichinomiya et al, 2016; Yamada et al, 2020; Ban et al, 2023). Currently, there are four identified morphotypes of silicified parmaleans, each distinguished by the morphological features of their silicified cell walls: Triparma , Tetraparma , ‘Scaly parma’, and Pentalamina , of which the last morphotype has not yet been isolated (Booth and Marchant, 1987; Ban et al, 2023; Sato et al, Unpublished).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we use the EukBank database, which provides by far the largest dataset for DNA metabarcodes targeting the 18S rRNA gene V4 region (Kaneko et al, 2023), and associate these data with the current knowledge of Parmales, including information from recent isolates from Triparma , Tetraparma , and ‘Scaly parma’ (Yamada et al, 2020; Ban et al, 2023). The EukBank project consolidates multiple datasets originating from various sampling projects including Tara Oceans (Pesant et al, 2015; Sunagawa et al, 2020), Malaspina (Logares et al, 2020), and Australian Microbiome (Brown et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Global distribution and diversity of marine Parmales

Ban,

Endo,

Kuwata

et al. 2023

Preprint

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Parmales (Bolidophyceae) is a minor eukaryotic phytoplankton group, sister to diatoms, that exists as two distinct forms of unicellular organisms: silicified cells and naked flagellates. Since their discovery, many field studies of Parmales have been performed, but their global distribution remains under-investigated. Here, we compile over 3,000 marine DNA metabarcoding datasets targeting the V4 region of the 18S rRNA gene from the EukBank database. By linking this large dataset with the latest morphological and genetic information, we provide updated estimates on the diversity and distribution of Parmales in the global ocean at a fine taxonomic resolution. Parmalean amplicon sequence variants (ASVs) were detected in nearly 90% of the analyzed samples. However, the relative abundance of parmaleans in the eukaryotic community is less than 0.2% on average, and the estimated true richness of parmalean ASVs is about 316 ASVs, confirming their low abundance and low diversity. Phylogenetic analysis clearly divides these algae into four clades, and three known morphotypes of silicified cells were classified into three different clades. The abundance of Parmales is generally high in the pole and decreases toward the tropics, and individual clades/subclades show further distinctions in distributions. Overall, our results suggest their clade/subclade-specific adaptation to different ecological niches.

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“…After appropriate filtering, we compiled more than 3,000 marine samples from pole-to-pole oceanic regions, including coastal areas. We associated these data with current knowledge on Parmales, including information on recent isolates from Triparma , Tetraparma , and ‘Scaly parma’ ( Yamada et al , 2020 ; Ban et al , 2023 ). The present results quantitatively describe the diversity and distribution of Parmales at a fine taxonomic resolution.…”

mentioning

confidence: 99%

Global Distribution and Diversity of Marine Parmales

Ban,

Endo,

Kuwata

et al. 2024

Microb. Environ.

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Parmales (Bolidophyceae) is a minor eukaryotic phytoplankton group, sister to diatoms, which exists as two distinct forms of unicellular organisms: silicified cells and naked flagellates. Since their discovery, many field studies on Parmales have been performed; however, their global distribution has not yet been examined in detail. We herein compiled more than 3,000 marine DNA metabarcoding datasets targeting the V4 region of the 18S rRNA gene from the EukBank database. By linking this large dataset with the latest morphological and genetic information, we provide updated estimates on the diversity and distribution of Parmales in the global ocean at a fine taxonomic resolution. Parmalean amplicon sequence variants (ASVs) were detected in nearly 90% of the samples analyzed. However, the relative abundance of parmaleans in the eukaryotic community was less than 0.2% on average, and the estimated true richness of parmalean ASVs was approximately 316 ASVs, confirming their low abundance and diversity. A phylogenetic analysis divided these algae into four clades, and three known morphotypes of silicified cells were classified into three different clades. The abundance of Parmales is generally high in the poles and decreases towards the tropics, and individual clades/subclades show further distinctions in their distribution. Collectively, the present results suggest clade/subclade-specific adaptation to different ecological niches.

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New clade of silicified bolidophytes that belong to Triparma (Bolidophyceae, Stramenopiles)

Cited by 4 publications

References 23 publications

Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)

Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)

Global distribution and diversity of marine Parmales

Global Distribution and Diversity of Marine Parmales

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