Abstract
Although sandy coastal plains are important buffer zones to protect the coast line and maintain biological diversity and ecosystem services, these ecosystems have been endangered by anthropogenic activities. Thus, information on coastal biodiversity and forces shaping coastal biological diversity are extremely important for effective conservation strategies. In this study, we aimed to compare arbuscular mycorrhizal (AM) fungal communities from soil samples collected on the mainland and nearby islands located in Brazilian sandy coastal plain ecosystems (Restingas) to get information about AM fungal biogeography and identify factors shaping these communities. Soil samples were collected in 2013 and 2014 on the beachfront of the tropical sandy coastal plain at six sites (three island and three mainland locations) across the northeast, southeast, and south regions of Brazil. Overall, we recorded 53 AM fungal species from field and trap culture samples. The richness and diversity of AM fungal species did not differ between mainland and island locations, but AM fungal community assemblages were different between mainland and island environments and among most sites sampled. Glomeromycota communities registered from island samples showed higher heterogeneity than communities from mainland samples. Sandy coastal plains harbor diverse AM fungal communities structured by climatic, edaphic, and spatial factors, while the distance from the colonizing source (mainland environments) does not strongly affect the AM fungal communities in Brazilian coastal environments.
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Acknowledgements
The authors are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for providing a PhD scholarship to I.R. Silva, fellowship and research grants (Sisbiota Proc. 563342/2010-2, Universal Proc. 446.144/2014-2, and PQ Proc. 302.416/2010-2) to L.C. Maia and a Visiting Professor grant to F. Oehl (Proc. 491.912/2013-2). The authors also acknowledge a postdoctoral fellowship given to D.K.A. Silva by CNPq and Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE). The authors are indebted to Reginaldo Alves Ferreira Neto, Camilla Maciel Rabelo Pereira, and Maria Beatriz Barbosa de Barros Barreto for help during the field trips and collections. We are also indebt to Dr. Dorothy Araújo for helping with the plant species identification.
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Accumulation curves for observed and estimated AM fungal species richness, based on Chao 1, on the mainland and islands from field samples (TIFF 218 kb)
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Accumulation curves for observed and estimated AM fungal species richness, based on Chao 1, on the mainland and islands from trap culture samples (TIFF 43 kb)
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Venn diagram showing numbers of AM fungal species unique and shared between field and trap culture soil samples (TIFF 23 kb)
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da Silva, I.R., de Souza, F.A., da Silva, D.K.A. et al. Patterns of Arbuscular Mycorrhizal Fungal Distribution on Mainland and Island Sandy Coastal Plain Ecosystems in Brazil. Microb Ecol 74, 654–669 (2017). https://doi.org/10.1007/s00248-017-0979-x
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DOI: https://doi.org/10.1007/s00248-017-0979-x