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New Phytol. 2018 Nov;220(3):824-835. doi: 10.1111/nph.15120. Epub 2018 Apr 2.

Biocrust-forming mosses mitigate the impact of aridity on soil microbial communities in drylands: observational evidence from three continents.

Author information

1
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, 80309, USA.
2
Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, 2751, Australia.
3
Departamento de Biología y Geología, Física y Química Inorgánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, c/Tulipán s/n, 28933, Móstoles, Spain.
4
Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, 2052, Australia.
5
School of Forestry, Northern Arizona University, 200 S. Pine Knoll Drive, Box 15018, Flagstaff, AZ, 86011, USA.
6
Global Centre for Land-Based Innovation, Western Sydney University, Penrith, NSW, 2751, Australia.

Abstract

Recent research indicates that increased aridity linked to climate change will reduce the diversity of soil microbial communities and shift their community composition in drylands, Earth's largest biome. However, we lack both a theoretical framework and solid empirical evidence of how important biotic components from drylands, such as biocrust-forming mosses, will regulate the responses of microbial communities to expected increases in aridity with climate change. Here we report results from a cross-continental (North America, Europe and Australia) survey of 39 locations from arid to humid ecosystems, where we evaluated how biocrust-forming mosses regulate the relationship between aridity and the community composition and diversity of soil bacteria and fungi in dryland ecosystems. Increasing aridity was negatively related to the richness of fungi, and either positively or negatively related to the relative abundance of selected microbial phyla, when biocrust-forming mosses were absent. Conversely, we found an overall lack of relationship between aridity and the relative abundance and richness of microbial communities under biocrust-forming mosses. Our results suggest that biocrust-forming mosses mitigate the impact of aridity on the community composition of globally distributed microbial taxa, and the diversity of fungi. They emphasize the importance of maintaining biocrusts as a sanctuary for soil microbes in drylands.

KEYWORDS:

aridity; bacteria; biodiversity; drylands; fungi; microbial composition

PMID:
29607501
DOI:
10.1111/nph.15120

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