Hodotermitidae
Hodotermitidae Temporal range: Early Cretaceous to present
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H. mossambicus worker and soldier | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Blattodea |
Infraorder: | Isoptera |
Parvorder: | Euisoptera |
Family: | Hodotermitidae Desneux, 1904 |
Genera | |
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The Hodotermitidae (from
General
The family consists of three extant genera and some 18 or 19 species.
Although they were once considered a part of
Nests
They nest by excavating in the soil, unlike the Archotermopsidae and Kalotermitidae.[2] In the case of Hodotermes mossambicus, the diffuse subterranean system of spherical hives may be located from near the surface to more than 6 m deep.[2][3] The hives may be 60 cm wide and are interconnected by galleries. Loose particles of excavated soil are brought to the surface and dumped at various points around the nest.[2] Colonies of Microhodotermes viator produce initially small,[6] conical mounds on soil with sufficient clay content.[3] Sociotomy, or the mass movement of representatives of all castes in a colony in order to found a new colony, is unknown in Hodotermitidae.[7][8]
Reproduction
Soon after rain showers, swarms of flying termites, alates or winged reproductives, emerge from their underground nests during summer evenings. When sufficiently distant from the parent nest, they land, shrug off their wings, and scout about for a mate. The pair then excavates a burrow to start a new colony. A week after swarming, the female lays her first eggs, which are tended by the couple, a task soon taken over by the maturing workers. After some four months, the nest is sufficiently developed to send foraging workers to the surface. For the next few years, most of the eggs develop into workers and a small number of soldiers. When the nest is sufficiently large, winged reproductives again develop.[9]
Diet and feeding
The workers of M. viator collect mostly woody material, with Pteronia and vygie species being favoured.[3] To the contrary, the diet of H. mossambicus consists primarily of ripe and/or frost- or drought-killed grass, though tree and shrub material is consumed to a lesser degree. In a stable isotope study of H. mossambicus, the grass component was found to constitute upwards of 94% of their food intake.[10] In this species, the sixth instar larvae digest and distribute food within the colony[10] by means of stomodeal trophallaxis. The mutual feeding also reinforces the colony's integrity, as the feeders discriminate against individuals with unfamiliar intestinal microbiota.[11]
Predators
Harvester termites form the main component in the diet of the diurnal bat-eared fox in east and southern Africa.[12] For this unusual diet, these foxes have 48 small teeth compared to the 42 teeth of all other dogs. They also have large ears to hear the insects in their underground chambers, before they are dug up. Similarly, the nocturnal fennec fox procures termites by digging.[12] Though the aardwolf is a specialized predator of certain Trinervitermes, they may assume a partially diurnal habit in winter to obtain harvester termites.[13] Widespread foraging and burrowing activities of aardvarks are associated with heuweltjies inhabited by M. viator.[6]
Economic impact
They can deplete grass in pastures and contribute to soil erosion, but are less effective when grasslands are not overgrazed or disturbed.[2][3] Over the long term, however, their decomposing and recycling of plant material contribute to soil fertility and the global cycling of carbon, nitrogen, and other elements.[10]
References
- ^ ISBN 978-0-7923-6361-3.
- ^ ISBN 978-0409-10487-5.
- ^ ISBN 978-1-77007-061-5.
- ^ "harvester termites". biolib.cz. Retrieved 18 October 2012.
- ISSN 0307-6970.
- ^ PMID 28312932.
- .
- ^ Grassé P. P.; Noirot, J. C. 1951. La Sociotomie: migration et fragmentation de la termitiere chez les Anoplotermes et les Trinervitermes. Behaviour 3: 146-166
- ^ Bell, R. A. (1999). "Insect Pests: Harvester Termites". Veld in KwaZulu-Natal 11.1. KwaZulu-Natal Department of Agriculture and Environmental Affairs. Archived from the original on 10 January 2011. Retrieved 21 October 2012.
- ^ .
- ^ Minkley, Nina; et al. "Nestmate discrimination in the harvester termite Hodotermes mossambicus". IUSSI. Archived from the original on 13 May 2008. Retrieved 18 October 2012.
- ^ a b Ewer, R. F. (1973). The Carnivores. New York: Cornell University Press. p. 161.
- ^ Holekamp, Kay E.; et al. "Aardwolf: Diet and Foraging". The extant (living) hyaena species. IUCN, Hyaena Specialist Group. Archived from the original on 15 April 2013. Retrieved 18 October 2012.
External links
- Data related to Hodotermitidae at Wikispecies
- Media related to Hodotermitidae at Wikimedia Commons
- Ecology of harvester termites discussed in Mystery of the Fairy Circles – The Secrets of Nature (21:50 – 25:30), YouTube