Zachariah, N and Murthy, TG and Borges, RM (2020) Moisture alone is sufficient to impart strength but not weathering resistance to termite mound soil. In: Royal Society Open Science, 7 (8).
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Abstract
Soil is used for the construction of structures by many animals, at times admixed with endogenous secretions. These additives, along with soil components, are suggested to have a role in biocementation. However, the relative contribution of endogenous and exogenous materials to soil strength has not been adequately established. Termite mounds are earthen structures with exceptional strength and durability including weathering resistance to wind and rain. With in situ and laboratory-based experiments, we demonstrate that the fungus-farming termite Odontotermes obesus which builds soil nest mounds, when given a choice, prefers soil close to its liquid limit for construction. At this moisture content, the soil-water mixture alone even in the absence of termite handling undergoes self-weight consolidation and upon drying attains a monolithic, densely packed structure with compressive strength comparable to the in situ strength of the mound soil; however, the soil-water mixture alone has lower resistance to water erosion than the in situ mound samples, suggesting that termite secretions impart weathering resistance and thereby long-term stability to the mound. Therefore, weathering resistance and compressive strength are conferred by different aspects of termite soil manipulation. Our work provides novel insights into termite mound construction and strength correlates for earthen structures built by animals. © 2020 The Authors.
| Item Type: | Journal Article |
|---|---|
| Publication: | Royal Society Open Science |
| Publisher: | Royal Society Publishing |
| Additional Information: | The copyright for this article belongs to the Author(S). |
| Keywords: | biocementation; ease of handling; extended phenotype; secretions; self-weight consolidation; weathering resistance |
| Department/Centre: | Division of Biological Sciences > Centre for Ecological Sciences Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 13 Jan 2023 06:45 |
| Last Modified: | 13 Jan 2023 06:45 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79109 |
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