Novel Widespread Marine Oomycetes Parasitising Diatoms, Including the Toxic Genus Pseudo-nitzschia: Genetic, Morphological, and Ecological Characterisation
Andrea Garvetto,Elisabeth Nézan,Yacine Badis,Gwenael Bilien,Paola Arce,Eileen Bresnan,Claire M. M. Gachon,Raffaele Siano +7 more
TLDR
Using single-cell techniques, morphologically and molecularly, intracellular parasitoids infecting four potentially toxin-producing Pseudo-nitzschia and one Melosira species on the North Atlantic coast are characterise and called for investigation of their phenology, evolution, and potential contribution in controlling their host spatial-temporal dynamics.Abstract:
Parasites are key drivers of phytoplankton bloom dynamics and related aquatic ecosystem processes. Yet, the dearth of morphological and molecular information hinders the assessment of their diversity and ecological role. Using single-cell techniques, we characterise morphologically and molecularly, intracellular parasitoids infecting four potentially toxin-producing Pseudo-nitzschia and one Melosira species on the North Atlantic coast. These sequences define two, morphologically indistinguishable clades within the phylum Oomycota, related to the genera of algal parasites Anisolpidium and Olpidiopsis and the diatom parasitoid species Miracula helgolandica. Our morphological data are insufficient to attribute either clade to the still unsequenced genus Ectrogella; hence it is proposed to name the clades OOM_1 and OOM_2. A screening of global databases of the barcode regions V4 and V9 of the 18S rDNA demonstrate the presence of these parasitoids beyond the North Atlantic coastal region. During a biweekly metabarcoding survey (Concarneau Bay, France), reads associated with one sequenced parasitoid coincided with the decline of Cerataulina pelagica bloom, whilst the other parasitoids co-occurred at low abundance with Pseudo-nitzschia. Our data highlight a complex and unexplored diversity of the oomycete parasitoids of diatoms and calls for the investigation of their phenology, evolution, and potential contribution in controlling their host spatial-temporal dynamics.read more
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Intracellular Infection of Diverse Diatoms by an Evolutionary Distinct Relative of the Fungi.
Aurélie Chambouvet,Adam Monier,Finlay Maguire,Finlay Maguire,Sarah Itoïz,Javier del Campo,Philippe Elies,Bente Edvardsen,Wenche Eikreim,Thomas A. Richards +9 more
TL;DR: It is suggested that such interactions can play a key role in diatom associated ecosystem functions, such as the marine carbon pump through necrotrophic-parasitism, facilitating the export of diatoms to the sediment.
Journal ArticleDOI
Chytrid infecting the bloom-forming marine diatom Skeletonema sp.:: Morphology, phylogeny and distribution of a novel species within the Rhizophydiales
Andrea Garvetto,Yacine Badis,Marie-Mathilde Perrineau,Cecilia Rad-Menéndez,Eileen Bresnan,Claire M. M. Gachon +5 more
TL;DR: A novel chytrid parasite of the dominant diatom genus Skeletonema is characterised, providing a first investigation of the global distribution of this organism by screening the Ocean Sampling Day (OSD) dataset, highlighting a northern transatlantic dissemination.
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Current distribution and potential expansion of the harmful benthic dinoflagellate Ostreopsis cf. siamensis towards the warming waters of the Bay of Biscay, North-East Atlantic
Kévin Drouet,Kévin Drouet,Cécile Jauzein,Dominique Herviot-Heath,Saeed Hariri,Aitor Laza-Martínez,Cyrielle Lecadet,Martin Plus,Sergio Seoane,Marc Sourisseau,Rodolphe Lemée,Raffaele Siano +11 more
TL;DR: In this paper, the authors used Lagrangian particle dispersal simulations to establish the current colonization of Ostreopsis cf. siamensis in the Bay of Biscay, assess the spatial connectivity among sampling zones, and identify the sentinel zones to monitor future expansion.
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Different community compositions between obligate and facultative oomycete plant parasites in a landscape-scale metabarcoding survey
TL;DR: A baseline of the diversity and distribution of soil oomycetes, classified by lifestyles (biotrophy), at the landscape scale in temperate grassland and forest, is provided, suggesting different ecological requirements of these two lifestyles.
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Host-parasitoid associations in marine planktonic time series: Can metabarcoding help reveal them?
Laura Käse,Katja Metfies,Stefan Neuhaus,Maarten Boersma,Maarten Boersma,Karen Helen Wiltshire,Alexandra Kraberg +6 more
TL;DR: In this paper, the authors created a dataset of a continuous three-year 18S metabarcoding survey to identify eukaryotic parasitoids, and potential connections to hosts at the Long-Term Ecological Research station Helgoland Roads.
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