Unoccupied mounds of soil-feeding termites host diverse soil fauna both in primary and logged tropical forests.

Tuma, Jiri; Yusah, Kalsum M.; Fayle, Tom M.

Unoccupied mounds of soil-feeding termites host diverse soil fauna both in primary and logged tropical forests.

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Tuma, Jiri

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Yusah, Kalsum M.

Fayle, Tom M.

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Date published

June 26, 2025

Abstract

Many termite species create conspicuous, aboveground soil nest mounds. Once the resident termite colony disappears, the mound structure gradually disintegrates. The now empty mound, which is rich in nutrients, and stable in microclimate, potentially provides an important microhabitat for a different range of species. However, the communities in unoccupied termite mounds remain poorly explored, and the relative importance of these mounds in anthropogenically modified habitats is completely unknown. Here we quantify the invertebrate communities in unoccupied mounds of the soil-feeding termites spp. in primary and logged lowland tropical rain forest in Malaysian Borneo and compare them to communities found in control soil. We also quantify the introgression of plant roots into the mounds. We found the unoccupied mounds support a range of invertebrate groups, with ants (Formicidae) having the highest abundances of any group across both habitats. Mounds supported significantly higher abundances of invertebrates overall in both primary forest (nine times more) and logged forest (five times more). However, the number of invertebrate taxa did not differ between mounds and control soils. Plant root mass was higher in control soils than in unoccupied mounds, possibly due to dominance of fine roots in the latter microhabitat. Using previous estimates of mound densities, we estimate that unoccupied spp. mounds support >340 000 invertebrate individuals in primary forest and >17 000 individuals in logged forest per hectare. Our results indicate that unoccupied mounds are an important, although ephemeral, microhabitat for a range of invertebrate groups, in both pristine and anthropogenically disturbed habitats.