Transient Microbes in Insects: Fleeting but Functional

Area of Science:

• Microbiology
• Insect Biology
• Ecology

Background:

• Insect gut microbiota are often acquired from the environment.
• These microbes can be transient, existing for short periods within the host.
• Transient microbes are frequently assumed to be non-functional commensals.

Purpose of the Study:

• To explore definitions of microbial transience in insect guts.
• To review evidence of functional roles for transient gut microbes in insects.
• To challenge the assumption that only permanent gut microbes benefit hosts.

Main Methods:

• Literature review of insect systems.
• Analysis of microbial transience definitions.
• Synthesis of studies on environmentally acquired gut microbes.

Main Results:

• Transience does not preclude beneficial functions for insect hosts.
• Environmentally acquired microbes can contribute to host fitness.
• Some transient microbes actively enable host fitness benefits.

Conclusions:

• The functional significance of transient insect gut microbes is underestimated.
• Rethinking microbial association is crucial for understanding insect gut microbiota.
• Environmentally acquired microbes play vital roles in host health and fitness.