Human travel and global trade have tremendously increased the spread of invasive microorganisms in new regions. Experimental and observational studies in terrestrial ecosystems are beginning to shed light on processes of microbial invasions, their ecological impacts and implications for ecosystem functioning. We provide examples of terrestrial invasive microorganisms, including bacteria, fungi, oomycetes and other protists, and viruses, and discuss the impacts of pathogenic and non-pathogenic invasive microorganisms at levels ranging from host species to ecosystems. This Review highlights that despite the recent progress in microbial invasion research, we are only beginning to understand how alien microorganisms interact with native microorganisms, and the implications of those interactions. Finally, we propose three research themes — microbial interactions, impacts and climate change — to make microbial invasion research a truly integrative discipline.
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Microbial invasion of a toxic medium is facilitated by a resident community but inhibited as the community co-evolves
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The authors thank K. Steinauer (Netherlands Institute of Ecology) for her suggestions on the manuscript. M.P.T. acknowledges funding from the German Research Foundation (TH 2307/1-1). W.H.v.d.P. acknowledges support from ERC Advanced Grants (ERC-ADV 323020, SPECIALS). S.G. acknowledges funding from the Netherlands Organization for Scientific Research (016.Veni.181.078). This is publication 6755 of the Netherlands Institute of Ecology.
The authors declare no competing interests.
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The second stage in the invasion process, when the alien species arrives in the new environment (including being kept in captivity or cultivation).
The fourth stage after the establishment, in which the alien species disperses to new locations and faces sequential establishment events.
The first stage in the invasion process, when a species is moved outside its known geographic boundary by human agency.
The third stage in the invasion process, when the alien species is able to maintain populations in the new environment over a longer period without direct help of humans.
Simplified ecological units/systems that attempt to mimic some features of ecological systems in laboratory settings.
- Spillover effects
The process in which a pathogen of one host infects another host.
The vulnerability of an environment (or a host) to invasion by alien organisms.
The ability of microorganisms to cause disease in a host.
- Propagule pressure
The initial size of the introduced population of an alien species in a new environment.
- Invasional meltdown
Positive interactions among alien species leading to their invasion success.
Reduction in disease risk due to a greater diversity of hosts.
A measure of biological diversity based on the quantification of how equal the community is in terms of abundance across species.
- Adaptive immunity
The acquired ability of an infected host to recognize and destroy the pathogen.
- Community modules
Configurations of species interactions within a community, such as predator–prey or host–pathogen pairs.
Collection of units (such as species or taxa) potentially interacting as a system (such as a community or ecosystem).
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Thakur, M.P., van der Putten, W.H., Cobben, M.M.P. et al. Microbial invasions in terrestrial ecosystems. Nat Rev Microbiol 17, 621–631 (2019). https://doi.org/10.1038/s41579-019-0236-z
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