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Accounting for environmental variation in co-occurrence modelling reveals the importance of positive interactions in root-associated fungal communities

Abrego, Nerea and Roslin, Tomas and Huotari, Tea and Tack, Ayco J. M. and Lindahl, Björn and Tikhonov, Gleb and Somervuo, Panu and Schmidt, Niels Martin and Ovaskainen, Otso (2020). Accounting for environmental variation in co-occurrence modelling reveals the importance of positive interactions in root-associated fungal communities. Molecular Ecology. 29 , 2736-2746
[Journal article]

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Abstract

Understanding the role of interspecific interactions in shaping ecological communities is one of the central goals in community ecology. In fungal communities, measuring interspecific interactions directly is challenging because these communities are composed of large numbers of species, many of which are unculturable. An indirect way of assessing the role of interspecific interactions in determining community structure is to identify the species co-occurrences that are not constrained by environmental conditions. In this study, we investigated co-occurrences among root-associated fungi, asking whether fungi co-occur more or less strongly than expected based on the environmental conditions and the host plant species examined. We generated molecular data on root-associated fungi of five plant species evenly sampled along an elevational gradient at a high arctic site. We analysed the data using a joint species distribution modelling approach that allowed us to identify those co-occurrences that could be explained by the environmental conditions and the host plant species, as well as those co-occurrences that remained unexplained and thus more probably reflect interactive associations. Our results indicate that not only negative but also positive interactions play an important role in shaping microbial communities in arctic plant roots. In particular, we found that mycorrhizal fungi are especially prone to positively co-occur with other fungal species. Our results bring new understanding to the structure of arctic interaction networks by suggesting that interactions among root-associated fungi are predominantly positive.

Authors/Creators:Abrego, Nerea and Roslin, Tomas and Huotari, Tea and Tack, Ayco J. M. and Lindahl, Björn and Tikhonov, Gleb and Somervuo, Panu and Schmidt, Niels Martin and Ovaskainen, Otso
Title:Accounting for environmental variation in co-occurrence modelling reveals the importance of positive interactions in root-associated fungal communities
Year of publishing :2020
Volume:29
Page range:2736-2746
Number of Pages:11
Publisher:Wiley
ISSN:0962-1083
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Arctic, co-occurrence, endophyte, interaction network, mycorrhiza, symbiotic network
URN:NBN:urn:nbn:se:slu:epsilon-p-106918
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-106918
Additional ID:
Type of IDID
DOI10.1111/mec.15516
Web of Science (WoS)000545103100001
ID Code:17417
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:07 Sep 2020 09:43
Metadata Last Modified:07 Sep 2020 09:43

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