Interannual dynamics of putative parasites (Syndiniales Group II) in a coastal ecosystem

Christaki, Urania; Skouroliakou, Dimitra-Ioli; Jardillier, Ludwig

doi:10.1111/1462-2920.16358

Cited by 6 publications

(4 citation statements)

References 64 publications

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“…Seasonal effects on Syndiniales may be minimized in the mixed layer due to their ubiquity, host range, and tolerance for variable physical and chemical conditions. Others have noted seasonality among Syndiniales in coastal time series with weekly resolution (43,44). Sampling intervals were less resolved (monthly) at BATS, which may have masked temporal effects.…”

Section: Spatiotemporal Variability and Environmental Drivers Of Synd...mentioning

confidence: 99%

Syndiniales parasites drive species networks and are a biomarker for carbon export in the oligotrophic ocean

Anderson

Blanco-Bercial

Carlson

et al. 2023

Preprint

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Microbial associations that result in phytoplankton mortality are important for carbon transport in the ocean. This includes parasitism, which in microbial food webs, is dominated by the marine alveolate group, Syndiniales. Parasites are expected to contribute to carbon recycling via host lysis; however, knowledge on host dynamics and correlation to carbon export remain unclear and limit the inclusion of parasitism in biogeochemical models. We analyzed a 4-year 18S rRNA metabarcoding dataset (2016-2019), performing network analysis for twelve discrete depths (1-1000 m) to determine Syndiniales-host associations in the seasonally oligotrophic Sargasso Sea. Analogous water column and sediment trap data were included to define environmental drivers of Syndiniales and their correlation with particulate carbon flux (150 m). Syndiniales accounted for 48-74% of network edges, most often associated with Dinophyceae and Arthropoda (mainly copepods) at the surface and Rhizaria (Polycystinea, Acantharea, and RAD-B) in the aphotic zone. Unlike other major groups, Syndiniales were significantly (and negatively) correlated with particulate carbon flux, suggesting parasites may drive flux attenuation through remineralization. Examination of Syndiniales amplicons revealed a range of depth patterns, including specific ecological niches and vertical connection among a subset (19%) of the community, the latter implying sinking of parasites (infected hosts or spores) on particles. Our findings point to the use of Syndiniales as biomarkers of carbon export, highlighting their importance for marine food webs and biogeochemistry.

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Section: Spatiotemporal Variability and Environmental Drivers Of Synd...mentioning

confidence: 99%

Syndiniales parasites drive species networks and are a biomarker for carbon export in the oligotrophic ocean

Anderson

Blanco-Bercial

Carlson

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Seasonal effects on Syndiniales may be minimized in the mixed layer due to their ubiquity, wide host range, and tolerance for variable physical and chemical conditions. Others have noted seasonal patterns among Syndiniales in coastal time series with weekly resolution [ 43–45 ]. Sampling intervals were less resolved (monthly) at BATS, which may have masked temporal effects.…”

Section: Resultsmentioning

confidence: 99%

“…In general, future work to enhance our understanding of Syndiniales population dynamics and biological relationships will hinge on integrating metabarcoding and other omics methods (metabolomics, transcriptomics, and proteomics) with quantitative approaches [ 43 , 56 , 68 ]. For instance, methods such as microscopy and flow cytometry can be used for cell counts and to monitor the percent of infected hosts, as parasites emit natural green autofluorescence under blue-violet excitation [ 69 , 70 ].…”

Section: Resultsmentioning

confidence: 99%

Role of Syndiniales parasites in depth-specific networks and carbon flux in the oligotrophic ocean

Anderson,

Blanco-Bercial,

Carlson

et al. 2024

ISME Communications

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Microbial associations that result in phytoplankton mortality are important for carbon transport in the ocean. This includes parasitism, which in microbial food webs is dominated by the marine alveolate group, Syndiniales. Parasites are expected to contribute to carbon recycling via host lysis; however, knowledge on host dynamics and correlation to carbon export remain unclear and limit the inclusion of parasitism in biogeochemical models. We analyzed a 4-year 18S rRNA gene metabarcoding dataset (2016–2019), performing network analysis for twelve discrete depths (1–1000 m) to determine Syndiniales-host associations in the seasonally oligotrophic Sargasso Sea. Analogous water column and sediment trap data were included to define environmental drivers of Syndiniales and their correlation with particulate carbon flux (150 m). Syndiniales accounted for 48–74% of network edges, most often associated with Dinophyceae and Arthropoda (mainly copepods) at the surface and Rhizaria (Polycystinea, Acantharea, and RAD-B) in the aphotic zone. Syndiniales were the only eukaryote group to be significantly (and negatively) correlated with particulate carbon flux, indicating their contribution to flux attenuation via remineralization. Examination of Syndiniales amplicons revealed a range of depth patterns, including specific ecological niches and vertical connection among a subset (19%) of the community, the latter implying sinking of parasites (infected hosts or spores) on particles. Our findings elevate the critical role of Syndiniales in marine microbial systems and reveal their potential use as biomarkers for carbon export.

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“…The present study was conducted in the coastal waters of the meso‐eutrophic Eastern English Channel (EEC), dominated by blooms of two phylogenetically distant and competing groups, Haptophytes (i.e., Phaeocystis globosa ) and Bacillariophyta (diatoms). Specifically, the phytoplankton succession in this area is characterized by a rich diatom winter community, recurrent P. globosa bloom in spring (e.g., Breton et al, 2006 ; Christaki et al, 2023 ), and transient diatom blooms in summer (Skouroliakou et al, 2022 ). We hypothesized that the bacterial seasonal community structure was associated with different seasonal phytoplankton communities but was also affected by P. globosa and transient summer diatom blooms.…”

Section: Introductionmentioning

confidence: 99%

Phaeocystis globosa and diatom blooms promote distinct bacterial communities and associations in a coastal ecosystem

Skouroliakou,

Breton,

Christaki

2024

Environ Microbiol Rep

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Phytoplankton and bacteria form the foundation of marine food webs. While most studies on phytoplankton bloom influence on bacteria dynamics focus on diatom‐dominated blooms due to their global ecological significance, it is unclear if similar patterns extend to other species that compete with diatoms like Phaeocystis spp. This study aimed to contribute to the understanding of associations between phytoplankton and bacteria in a temperate ecosystem. For this, we studied the dynamics of phytoplankton and bacteria, combining 16S metabarcoding, microscopy, and flow cytometry over 4 years (282 samples). Phytoplankton and bacterial communities were studied throughout the year, particularly during contrasting phytoplankton blooms dominated by the Haptophyte Phaeocystis globosa or diatoms. We applied extended local similarity analysis (eLSA) to construct networks during blooming and non‐blooming periods. Overall, the importance of seasonal and species‐specific interactions between phytoplankton and bacteria is highlighted. In winter, mixed diatom communities were interconnected with bacteria, indicating a synergistic degradation of diverse phytoplankton‐derived substrates. In spring, despite the intensity variations of P. globosa blooms, the composition of bacterial communities remained consistent over several years, suggesting establishing a stable‐state environment for bacterial communities. Specific associations between monospecific diatom blooms and bacteria were evidenced in summer.

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Interannual dynamics of putative parasites (Syndiniales Group II) in a coastal ecosystem

Cited by 6 publications

References 64 publications

Syndiniales parasites drive species networks and are a biomarker for carbon export in the oligotrophic ocean

Syndiniales parasites drive species networks and are a biomarker for carbon export in the oligotrophic ocean

Role of Syndiniales parasites in depth-specific networks and carbon flux in the oligotrophic ocean

Phaeocystis globosa and diatom blooms promote distinct bacterial communities and associations in a coastal ecosystem

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