Gut Microbes Digest Cellulose

Biological Strategy

Termites

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Chemically Break Down Organic Compounds

The vast majority of biochemical assembly and breakdown processes–even by the most complex organisms–occur within cells. In fact, cells are able to perform hundreds, even thousands of chemical transformations at the same time under life-friendly conditions (ambient temperature and pressure in an aqueous environment). Part of the reason that decomposition reactions (chemical breakdown) can occur under such mild conditions is because most often, they occur in a stepwise, enzyme-mediated fashion, sipping or releasing small amounts of energy at each step. For example, the breakdown of glucose to pyruvate–and the release of energy–occurs in the 10-step enzyme catalyzed process of glycolysis.

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Insects

Class Insecta (“an insect”): Flies, ants, beetles, cockroaches, fleas, dragonflies

Insects are the most abundant arthropods—they make up 90% of the animals in the phylum. They’re found everywhere on earth except the deep ocean, and scientists estimate there are millions of insects not yet described. Most live on land, but many live in freshwater or saltwater marshes for part of their life cycles. Insects have three distinct body sections: a head, which has specialized mouthparts, a thorax, which has jointed legs, and an abdomen. They have well-developed nervous and sensory systems, and are the only invertebrate that can fly, thanks to their lightweight exoskeletons and small size.

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Guts of termites digest cellulose via microbial symbionts.

These Termites Turn Your House into a Palace of Poop

“Termites do not digest directly…instead they collect vegetation, chew it up, and leave the chemical breakdown to other organisms. There are two strategies. The most primitive termites swallow the vegetation and pass it to a fermentation chamber where anaerobic bacteria and protozoa break down the cellulose…More advanced species have a different feeding strategy. The energy source is still cellulose, but it is digested outside the termite’s body…Fungi is the only kingdom of organisms able to digest cellulose in air, though they need warmth and humidity to do the job efficiently.” (Gould and Gould 2007:132-133)

Last Updated October 5, 2016

References

“Termites do not digest cellulose directly…instead they collect vegetation, chew it up, and leave the chemical breakdown to other organisms. There are two strategies. The most primitive termites swallow the vegetation and pass it to a fermentation chamber where anaerobic bacteria and protozoa break down the cellulose…More advanced species have a different feeding strategy. The energy source is still cellulose, but it is digested outside the termite’s body…Fungi is the only kingdom of organisms able to digest cellulose in air, though they need warmth and humidity to do the job efficiently.” (Gould and Gould 2007:132-133)

Book

Animal Architects: Building and the Evolution of Intelligence

Basic Books | 06/03/2012 | James L. Gould

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