Proceedings of the fourth meeting of the International Union of Forest Research Organizations (IUFRO) Working Party S07.02.09: Phytophthoras in forests and natural ecosystems

Goheen, E. M.; Frankel, Susan J.

doi:10.2737/psw-gtr-221

Cited by 8 publications

(1 citation statement)

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“…They dominate terrestrial habitats (Urich et al, 2008;Voss et al, 2019) and harbor important plant pathogens, such as the Endomyxa, which have recently been elevated from the Cercozoa into a separate phylum (Cavalier-Smith et al, 2018). Another protistan taxon, the Oomycetes (Stramenopiles), contain important parasites of forest trees, and many lineages produce caducous sporangia for dissemination (Goheen & Frankel, 2009;Robideau et al, 2011;Lang-Yona et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

To the canopy and beyond: Air samples reveal wind dispersal as a driver of ubiquitous protistan pathogen assembly in tree canopies

Jauss

Nowack

Walden

et al. 2020

Preprint

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We analyzed air dispersal of the protistan phyla Cercozoa and Oomycota with an air sampler near the ground (~2 m) and in tree crowns (~25 m) of three tree species (oak, linden and ash) in a temperate floodplain forest in March (before leafing) and May (after leaf unfolding) with a cultivation-independent high throughput metabarcoding approach. Both, Cercozoa and Oomycota, contain important pathogens of forest trees and other vegetation. We found a high diversity of Cercozoa and Oomycota in air samples with 122 and 81 OTUs, respectively. Especially oomycetes showed a high temporal variation in beta diversity between both sampling dates. Differences in community composition between air samples in tree canopies and close to the ground were however negligible, and also tree species identity did not affect communities in air samples, indicating that the distribution of protistan propagules through the air was not spatially restricted in the forest ecosystem. OTUs of plant pathogens, whose host species that did not occur in the forest, demonstrate wind dispersal of propagules from outside the forest biome. Overall, our results lead to a better understanding of the stochastic processes of wind dispersal of protists and protistan pathogens, a prerequisite to understand the mechanisms of their community assembly in forest ecosystems.

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