Island biogeography of soil bacteria and fungi: similar patterns, but different mechanisms

Shao peng Li, Pandeng Wang, Yongjian Chen, Maxwell C. Wilson, Xian Yang, Chao Ma, Jianbo Lu, Xiao yong Chen, Jianguo Wu, Wen sheng Shu, Lin Jiang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Microbes, similar to plants and animals, exhibit biogeographic patterns. However, in contrast with the considerable knowledge on the island biogeography of higher organisms, we know little about the distribution of microorganisms within and among islands. Here, we explored insular soil bacterial and fungal biogeography and underlying mechanisms, using soil microbiota from a group of land-bridge islands as a model system. Similar to island species-area relationships observed for many macroorganisms, both island-scale bacterial and fungal diversity increased with island area; neither diversity, however, was affected by island isolation. By contrast, bacterial and fungal communities exhibited strikingly different assembly patterns within islands. The loss of bacterial diversity on smaller islands was driven primarily by the systematic decline of diversity within samples, whereas the loss of fungal diversity on smaller islands was driven primarily by the homogenization of community composition among samples. Lower soil moisture limited within-sample bacterial diversity, whereas smaller spatial distances among samples restricted among-sample fungal diversity, on smaller islands. These results indicate that among-island differences in habitat quality generate the bacterial island species-area relationship, whereas within-island dispersal limitation generates the fungal island species-area relationship. Together, our study suggests that different mechanisms underlie similar island biogeography patterns of soil bacteria and fungi.

Original languageEnglish (US)
Pages (from-to)1886-1896
Number of pages11
JournalISME Journal
Volume14
Issue number7
DOIs
StatePublished - Jul 1 2020

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

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