Dispersal limitations and historical factors determine the biogeography of specialized terrestrial protists

Singer, David; Mitchell, Edward A. D.; Payne, Richard J.; Blandenier, Quentin; Duckert, Clément; Fernández, Leonardo; Fournier, Bertrand; Hernández, Cristián E.; Granath, Gustaf; Rydin, Håkan; Bragazza, Luca; Koronatova, Natalia G.; Goia, Irina; Harris, Lorna I.; Kajukało, Katarzyna; Kosakyan, Anush; Lamentowicz, Mariusz; Kosykh, Natalia P.; Vellak, Kai; Lara, Enrique

doi:10.1111/mec.15117

Cited by 40 publications

(40 citation statements)

References 82 publications

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“…3, Supplementary Figs 11 and 12), indicating that anagenetic processes (range expansion/contraction) alone do not account for all changes in species distributions. Withinregion speciation was at least as important as founder events, as was also observed in soil amoebae 5 . Considering the large spatial scale of our modelled geographic regions, in which some areas separated by thousands of kilometers of open ocean were merged ( Fig.…”

Section: Resultsmentioning

confidence: 66%

“…However, an increasing body of work indicates that micro-organisms instead display distinct biogeographies 2 . Although cosmopolitan species exist 3 , geographically restricted species have been found in aquatic 4 and terrestrial 5 environments. In addition, the introduction of high-throughput DNA sequencing has identified previously undocumented diversity in multiple groups 6 , most of which are present at low (<0.1%) abundances 7 .…”

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confidence: 99%

“…Although crucial to ecosystem functioning in aquatic 10 and terrestrial 11 environments, they are often omitted from microbiome surveys due to costs and complications arising from the necessity of having to use different primer sets. Nonetheless, recent studies of protists have revealed the existence of (pseudo)cryptic diversity in presumably cosmopolitan taxa 5,12 indicating that their global diversity is almost certainly underestimated. In particular, diatoms, a group of Stramenopile microalgae, represent one of the most species-rich and abundant protist groups 12 .…”

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confidence: 99%

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Global radiation in a rare biosphere soil diatom

et al. 2020

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Soil microorganisms drive the global carbon and nutrient cycles that underlie essential ecosystem functions. Yet, we are only beginning to grasp the drivers of terrestrial microbial diversity and biogeography, which presents a substantial barrier to understanding community dynamics and ecosystem functioning. This is especially true for soil protists, which despite their functional significance have received comparatively less interest than their bacterial counterparts. Here, we investigate the diversification of Pinnularia borealis, a rare biosphere soil diatom species complex, using a global sampling of >800 strains. We document unprecedented high levels of species-diversity, reflecting a global radiation since the Eocene/ Oligocene global cooling. Our analyses suggest diversification was largely driven by colonization of novel geographic areas and subsequent evolution in isolation. These results illuminate our understanding of how protist diversity, biogeographical patterns, and members of the rare biosphere are generated, and suggest allopatric speciation to be a powerful mechanism for diversification of microorganisms .

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Section: Resultsmentioning

confidence: 66%

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Global radiation in a rare biosphere soil diatom

et al. 2020

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“…Of ecological relevance, some closely related and morphologically similar (pseudo-cryptic) species (e.g., Nebela guttata Kosakyan et Lara 2012 and Nebela gimlii Singer et Lara 2015) were shown to occupy different ecological niches (Singer et al, 2018). Hyalosphenia papilio Leidy, 1874, a common species in northern Sphagnum peatlands was found to be a species complex comprising at least 13 distinct genetic lineages with geographically limited distributions (Heger et al, 2013;Singer et al, 2019).…”

Section: Testate Amoeba Molecular Variability Vs Trait Variabilitymentioning

confidence: 99%

Testate Amoeba Functional Traits and Their Use in Paleoecology

et al. 2020

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This review provides a synthesis of current knowledge on the morphological and functional traits of testate amoebae, a polyphyletic group of protists commonly used as proxies of past hydrological changes in paleoecological investigations from peatland, lake sediment and soil archives. A trait-based approach to understanding testate amoebae ecology and paleoecology has gained in popularity in recent years, with research showing that morphological characteristics provide complementary information to the commonly used environmental inferences based on testate amoeba (morpho-)species data. We provide a broad overview of testate amoeba morphological and functional traits and trait-environment relationships in the context of ecology, evolution, genetics, biogeography, and paleoecology. As examples we report upon previous ecological and paleoecological studies that used trait-based approaches, and describe key testate amoebae traits that can be used to improve the interpretation of environmental studies. We also highlight knowledge gaps and speculate on potential future directions for the application of trait-based approaches in testate amoeba research.

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“…Several large-scale studies have tried to identify environmental drivers of protistan diversity and community assembly [6,24,25,[42][43][44]. However, the complexity of their diverse sizes, morphotypes, and diverse feeding modes complicates the detection of specific environmental drivers for a group of taxa.…”

Section: Discussionmentioning

confidence: 99%

What Drives the Diversity of the Most Abundant Terrestrial Cercozoan Family (Rhogostomidae, Cercozoa, Rhizaria)?

et al. 2020

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Environmental sequencing surveys of soils and freshwaters revealed high abundance and diversity of the Rhogostomidae, a group of omnivorous thecate amoebae. This is puzzling since only a few Rhogostomidae species have yet been described and only a handful of reports mention them in field surveys. We investigated the putative cryptic diversity of the Rhogostomidae by a critical re-evaluation of published environmental sequencing data and in-depth ecological and morphological trait analyses. The Rhogostomidae exhibit an amazing diversity of genetically distinct clades that occur in a variety of different environments. We further broadly sampled for Rhogostomidae species; based on these isolates, we describe eleven new species and highlight important morphological traits for species delimitation. The most important environmental drivers that shape the Rhogostomidae community were soil moisture, soil pH, and total plant biomass. The length/width ratio of the theca was a morphological trait related to the colonized habitats, but not the shape and size of the aperture that is often linked to moisture adaption in testate and thecate amoebae.

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Dispersal limitations and historical factors determine the biogeography of specialized terrestrial protists

Cited by 40 publications

References 82 publications

Global radiation in a rare biosphere soil diatom

Global radiation in a rare biosphere soil diatom

Testate Amoeba Functional Traits and Their Use in Paleoecology

What Drives the Diversity of the Most Abundant Terrestrial Cercozoan Family (Rhogostomidae, Cercozoa, Rhizaria)?

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