Chewing through challenges: Exploring the evolutionary pathways to wood-feeding in insects
Cristian F Beza-Beza1,2, Brian M Wiegmann2, Jessica A Ware3
1Department of Entomology, University of Minnesota, St Paul, Minnesota, USA.
Summary
Insects evolved to eat decaying wood (saproxylophagy) by first being detritivores. Symbiotic gut microbes are key to digesting wood, impacting nutrient cycling.
Area of Science:
- Ecology
- Evolutionary Biology
- Microbiology
Background:
- Decaying wood is a challenging food source due to its structure and low nitrogen.
- Saproxylophagy (wood-feeding) has evolved in diverse insect groups, influencing ecosystems.
- Understanding the evolution of wood-feeding is crucial for nutrient cycling and carbon sequestration.
Purpose of the Study:
- To investigate the phylogenetic distribution and evolutionary origins of saproxylophagy in insects.
- To explore the role of gut microbiomes in the adaptation to wood-feeding.
- To propose an evolutionary pathway for the development of saproxylophagy.
Main Methods:
- Phylogenetic analysis of saproxylophagy across insect orders.
- Comparative analysis of gut microbiome data from wood-feeding and non-wood-feeding insects.
- Inclusion of new microbiome data from understudied wood-feeding insect species.
Main Results:
- Saproxylophagy shows an uneven phylogenetic distribution among insects.
- Symbiotic gut microbiomes play a critical role in enabling wood digestion.
- The 'Detritivore-First Hypothesis' proposes a plausible evolutionary route to saproxylophagy.
Conclusions:
- The evolution of saproxylophagy is facilitated by symbiotic gut microbes.
- An ancestral detritivorous diet likely preceded the specialization of wood-feeding.
- Insect wood-feeding adaptations have significant ecological implications for nutrient cycling and carbon storage.
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