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c 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access
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diversity
Article
Diversity and Structure of Soil Fungal Communities
across Experimental Everglades Tree Islands
Brianna K. Almeida 1
, Michael S. Ross 2,3, Susana L. Stoffella 3
, Jay P. Sah 3
, Eric Cline 4
,
Fred Sklar 4 and Michelle E. Afkhami 1,*
1 Biology Department, University of Miami, Coral Gables, FL 33146, USA; [email protected]
2 Department of Earth and Environment, Florida International University, Miami, FL 33199, USA;
3
Institute of Environment, Florida International University, Miami, FL 33199, USA; [email protected] (S.L.S.);
4 South Florida Water Management District, West Palm Beach, FL 33406, USA; [email protected] (E.C.);
* Correspondence: [email protected]; Tel.: +1-305-284-1796
Received: 29 June 2020; Accepted: 19 August 2020; Published: 25 August 2020


Abstract: Fungi play prominent roles in ecosystem services (e.g., nutrient cycling, decomposition)
and thus have increasingly garnered attention in restoration ecology. However, it is unclear how most
management decisions impact fungal communities, making it difficult to protect fungal diversity and
utilize fungi to improve restoration success. To understand the effects of restoration decisions and
environmental variation on fungal communities, we sequenced soil fungal microbiomes from 96 sites
across eight experimental Everglades tree islands approximately 15 years after restoration occurred.
We found that early restoration decisions can have enduring consequences for fungal communities.
Factors experimentally manipulated in 2003–2007 (e.g., type of island core) had significant legacy
effects on fungal community composition. Our results also emphasized the role of water regime
in fungal diversity, composition, and function. As the relative water level decreased, so did fungal
diversity, with an approximately 25% decline in the driest sites. Further, as the water level decreased,
the abundance of the plant pathogen–saprotroph guild increased, suggesting that low water may
increase plant-pathogen interactions. Our results indicate that early restoration decisions can have
long-term consequences for fungal community composition and function and suggest that a drier
future in the Everglades could reduce fungal diversity on imperiled tree islands.
Keywords: hydrology; pathogens; restoration; saprotrophs; soil microbiome; tree density; understory
plant community
1. Introduction
Fungi play important roles in many ecosystem functions and services, especially those that involve
soil [1,2], where they make up an estimated 55–85% of the microbial biomass [3,4]. These fungi are
crucial for the decomposition of organic carbon, cycling of nitrogen and phosphorus, and belowground
carbon sequestration [1,5–7]. Soil fungi also indirectly contribute to ecosystem function through
their interactions with primary producers. For instance, they affect plant growth and community
composition through pathogenic attacks on particular plant taxa, changes to plant–plant competition,
and beneficial interactions that ameliorate environmental stress [8–12]. Given the important ecological
roles of fungi and their interactions with primary producers, soil fungal communities can be a valuable