Regional microbiome differentiation of the invasive<i>Sargassum muticum</i>(Fucales, Phaeophyceae) follows the generalist host hypothesis across the North East Atlantic

Aires, Tánia; Kläui, Anita; Engelen, Aschwin H.

doi:10.1080/09670262.2022.2103738

Cited by 4 publications

(4 citation statements)

References 60 publications

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“…Such relationships, termed phylosymbiosis, are increasingly found throughout the tree of life (Kohl, 2020; Lim & Bordenstein, 2020) and have previously been identified in seaweeds (Lachnit et al, 2009; Lemay et al, 2021; Marzinelli et al, 2015; Menaa et al, 2020). Seaweeds may actively modulate the composition of their microbiomes using chemical signals (Seymour et al, 2017), which may cause such a tight association that geographical structure becomes relatively unimportant (Marzinelli et al, 2015), and even forced translocation of an individual to another environment may have virtually no effects on its microbiome composition (Aires et al, 2023). A particularly intriguing observation in our data was that the eukaryomes of brown algae appeared co‐diverged with host phylogeny only when measuring symbiont phylogenetic structure (UniFrac distance) but not symbiont abundances (Bray–Curtis distance), whereas the opposite was observed for red algae.…”

Section: Discussionmentioning

confidence: 99%

“…For example, in Arctic inshore waters, macroalgae account for 23% of local primary production (Küpper et al, 2016). Conversely, other seaweed species are highly invasive, accounting for as much as 80% of local invasions among other marine organisms and thus posing a net negative impact on marine ecosystems (Aires et al, 2023; Küpper & Kamenos, 2018; Schaffelke & Hewitt, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Macroalgal eukaryotic microbiome composition indicates novel phylogenetic diversity and broad host spectrum of oomycete pathogens

Timanikova,

Fletcher,

Han

et al. 2024

Environmental Microbiology

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Seaweeds are important components of marine ecosystems with emerging potential in aquaculture and as sources of biofuel, food products and pharmacological compounds. However, an increasingly recognised threat to natural and industrial seaweed populations is infection with parasitic single‐celled eukaryotes from the relatively understudied oomycete lineage. Here we examine the eukaryomes of diverse brown, red and green marine macroalgae collected from polar (Baffin Island), cold‐temperate (Falkland Islands) and tropical (Ascension Island) locations, with a focus on oomycete and closely related diatom taxa. Using 18S rRNA gene amplicon sequencing, we show unexpected genetic and taxonomic diversity of the eukaryomes, a strong broad‐brush association between eukaryome composition and geographic location, and some evidence of association between eukaryome structure and macroalgal phylogenetic relationships (phylosymbiosis). However, the oomycete fraction of the eukaryome showed disparate patterns of diversity and structure, highlighting much weaker association with geography and no evidence of phylosymbiosis. We present several novel haplotypes of the most common oomycete Eurychasma dicksonii and report for the first time a cosmopolitan distribution and absence of host specificity of this important pathogen. This indicates rich diversity in macroalgal oomycete pathogens and highlights that these pathogens may be generalist and highly adaptable to diverse environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Macroalgal eukaryotic microbiome composition indicates novel phylogenetic diversity and broad host spectrum of oomycete pathogens

Timanikova,

Fletcher,

Han

et al. 2024

Environmental Microbiology

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“…Indeed, studies of macroalgal grazers in Portugal indicated preference for feeding on native seaweed compared with S. muticum (Engelen et al ., 2011). Furthermore, recent studies of the microbiome associated with S. muticum reveal this species may benefit by being a generalist host (Aires et al ., 2022). Ready replacement of its microbiome in new geographic regions may be another means by which S. muticum is able to spread so effectively.…”

Section: Impacts On Local Biodiversity and Potential Economic Impactsmentioning

confidence: 99%

“…Over the past half a century or so, reports of S. muticum in European waters form arguably the most complete record of the geographic spread of an invasive non-native aquatic species (Deysher and Norton, 1982; Critchley et al ., 1983; Knoepffler-Peguy et al ., 1985; Rueness, 1989; Harries et al ., 2007; Kraan, 2008; Engelen et al ., 2015). Since the 1980s, this species has been recorded in the Atlantic from Morocco to Norway (Rueness, 1989; Aires et al ., 2022), including the Mediterranean Sea (Engelen et al ., 2015).…”

Section: The Spread Of S Muticum In Europe and The Ukmentioning

confidence: 99%

The establishment of the invasive non-native macroalgaSargassum muticumin the north of Scotland

Want,

Matejusova,

Kakkonen

2023

J. Mar. Biol. Ass.

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The spread of the brown seaweed Sargassum muticum is one of the best documented invasions of a non-native marine species. Observation of a potentially established population of S. muticum in the Orkney Islands archipelago, located off the northern coast of Scotland, was reported by recreational snorkellers in 2019 and 2020. The present study summarises a focussed investigation to confirm its presence and current local distribution, using data from 46 survey sites monitored as a part of the Orkney Islands Council Harbour Authority monitoring programme. Findings in this study represent the most northerly record of an established population of S. muticum in the United Kingdom, extending the latitudinal range in this country by 1.44° (159 km) northwards, and indicate only localised presence of this species. Analysis of a partial cytochrome oxidase I gene sequence confirmed the visual species identification. Possible vectors of introduction, gaps in the geographic range, local ecological and economic impacts, and the potential ameliorating factor of deep rockpools on wave exposed shores for S. muticum are discussed.

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Seasonal cycles in a seaweed holobiont: A multiyear time series reveals repetitive microbial shifts and core taxa

Mudlaff,

Weinberger,

Düsedau

et al. 2024

Preprint

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Seasonality is an important natural feature that drives cyclic environmental changes. Seaweed holobionts, inhabiting shallow waters such as rocky shores and mud flats, are subject to seasonal changes in particular, but little is known on the influence of seasonality on their microbial communities. In this study, we conducted a bi-monthly, three-year time series to assess the seasonality of microbial epibiota in the seaweed holobiont Gracilaria vermiculophylla. Our results reveal pronounced seasonal shifts that are both taxonomic and functional, oscillating between late winter and early summer across consecutive years. While epibiota varied taxonomically between populations, they were functionally similar, indicating that seasonal variability drives functional changes, while spatial variability is more redundant. We also identified seasonal core microbiota that consistently (re)associated with the host at specific times, alongside a permanent core that is present year-round, independent of season or geography. These findings highlight the dynamic yet resilient nature of seaweed holobionts and demonstrate that their epibiota undergo predictable changes. Therewith, the research offers important insights into the temporal dynamics of seaweed-associated microbiota, and demonstrates that the relationship between seaweed host and its epibiota is not static, but naturally subject to an ongoing seasonal succession process.

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Regional microbiome differentiation of the invasiveSargassum muticum(Fucales, Phaeophyceae) follows the generalist host hypothesis across the North East Atlantic

Cited by 4 publications

References 60 publications

Macroalgal eukaryotic microbiome composition indicates novel phylogenetic diversity and broad host spectrum of oomycete pathogens

Macroalgal eukaryotic microbiome composition indicates novel phylogenetic diversity and broad host spectrum of oomycete pathogens

The establishment of the invasive non-native macroalgaSargassum muticumin the north of Scotland

Seasonal cycles in a seaweed holobiont: A multiyear time series reveals repetitive microbial shifts and core taxa

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