Zootermopsis angusticollis

Zootermopsis angusticollis is a species of termite (Isoptera) in the family Archotermopsidae, a group known as the dampwood termites, or the rottenwood termites.[1] As their name suggests, the dampwood termites can only survive by living off of wood that contains high amounts of moisture. They are found along the wet environments of the Pacific coast of North America. Most are found in the states of California, Oregon, Washington, Idaho, Western Nevada and in southern British Columbia.[2] Termites are well known to be destroyers of wood, and although the dampwood termites can cause some damage, they are not as notoriously known to cause as much damage to buildings as the drywood termites. They occasionally have been carried to other parts of the country through wood shipments, but have not been able to become established in these areas due to undesirable environmental conditions.[1]

Zootermopsis angusticollis
Pacific Coast Dampwood Termite, Zootermopsis angusticollis, British Columbia
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Isoptera
Family:
Archotermopsidae
Genus:
Zootermopsis
Species:
Z. angusticollis
Binomial name
Zootermopsis angusticollis
Hagen, 1858

Identification

Z. angusticollis is a hemimetabolous, diploid species. Upon hatching from their egg, they are quite similar to adults except for their lack of genitalia. Their series of morphological instars allows them to increase in size until they reach their adult stage.[3]

Like all other termites, the dampwood termites live in eusocial colonies that contain workers, soldiers, nymphs (semi-mature young), and both male and female reproductive individuals.[4] Along with the order Hymenoptera, Isoptera is the only order to display eusocial behaviors.[4] When a colony is found, it is typically the nymphs that are observed. The winged individuals are light brown with dark brown leathery wings, whereas the nymphs are cream colored with a dark abdomen.[1] The dampwood termites are some of the largest termites in North America.[1]

An important sign to identifying dampwood termite infestations is their unique fecal pellets. They are approximately 1 mm in length and slightly hexagonal.[1]

Habitat
Fecal pellets

Unlike the more common drywood termites, the dampwood termites are very tolerant of wet conditions and build their colonies in damp wood such as rotting stumps and logs or other types of wood debris from coniferous trees.[5][6] Individuals living within the colony will live the entirety of their life within the same piece of wood. They will never leave to forage, as the wood is also their food source.[2] However, winged or alate females will leave on a mating flight in order to fulfill their primary role of the queen.[2] Winged individuals are known to be great fliers and can reach distances of up to 350 meters.[5] When the colony becomes too large for its habitat, it will swarm, however, this puts them at risk for exposure to pathogens and possible increased mortality.[7] Swarms only contain about 50-60 individuals.[1]

Behavior

Members of the colony go through a series of polymorphic instars throughout their lifetime.[8] Cannibalism is found within the termite species in order to rid the colony of dead or injured individuals that may disrupt movement.[8] Individuals warn colony members by creating sounds through convulsive movements that move their body up and down to strike the floor and ceiling of the nest.[9]

Mating Systems

Zootermopsis angusticollis are hemimetabolous, diploid insects.[4] Once a male and female have selected one another during their mating flights, they proceed to occupy a hole which they will then seal. Mating takes place within two weeks.[1] After a mated queen lays her eggs, about 15–20 days later, a colony is established.[10] Approximately 12 eggs are laid at once [1] The queen, a mated female, is monogamous, and will lay her eggs in spurts followed by periods of inactivity.[8] Egg production in termite queens is positively correlated with the size of the queen who then becomes wingless after her Nuptial flight.[2] Termite queens are able to live for decades with the longest recorded length of 28.5 years.[2] In relation to size, mature queens are on average larger than male kings, making them easier to identify within a colony.[2] Within the colony, other female workers do not reproduce or mate as their ovaries become inactive in the presence of pheromones produced by the queen.[10]

Unlike the eusocial order Hymenoptera, termite colonies inbreed which has been found to increase immunity to pathogens that may be exposed to the colony through introduction of outside members. Outbreeding studies performed with Z. angusticollis and colonies that are genetically dissimilar have resulted in higher mortality rates among the colony. Therefore, Z. angusticollis inbreeding and monogamous behaviors help them to avoid outbreeding depression.[4]

Model Species for Hindgut Ecology

Zootermopsis angusticolis  are known to contain many different species of symbiont microbials within their hindgut that help to digest the wood they primarily consume. It can be argued that this species may be one of the best studied of the lower termites in terms of hindgut symbionts. The symbionts and the termite are thought to have co-evolved with one another. This specific species of termite has been studies for almost 100 years. Protists found within the termites hindgut include many species from the genus Trichonympha such as : Hexmastix temopsidis, Tricercomitus termopsidis, Trichomitopsis termopsidis, Trichonypha campanula, Trichonympha collaris, Trichonympha sphaerica and Streblomastis strix.[11]

References
  1. Nepper, W (2016). "Pacific dampwood termite". Pest Management Professional. 84: 66.
  2. Thorne, B.L.; Breisch, N.L.; Haverty, M.I. (2002). "Longevity of kings and queens and first time of production of fertility progeny in dampwood termite (Isoptera; Termopsidae; Zootermopsis) colonies with different reproductive structures". Journal of Animal Ecology. 71 (6): 1030–1041. doi:10.1046/j.1365-2656.2002.00666.x.
  3. Carlini, D.B.; Makowski, M. (2015). "Codon bias and gene ontology in holometabolous and hemimetabolous insects". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 324 (8): 686–699. doi:10.1002/jez.b.22647.
  4. Rosengaus, R.B.; Traniello, J.F.A. (1993). "Disease risk as a cost of outbreeding in the termite Zootermopsis anugsticollis". Proceedings of the National Academy of Sciences of the United States of America. 90 (14): 6641–6645. doi:10.1073/pnas.90.14.6641.
  5. Booth, W.; Brent, C.S.; Calleri, D.V.; Rosengaus, R.B.; Traniello, J.F.A.; Vargo, E.L. (2012). "Population genetic structure and colony breeding system in dampwood termite (Zootermopsis angusticollis and Z. nevadensis nuttingi)". Insectes Sociaux. 59 (1): 127–137. doi:10.1007/s00040-011-0198-2.
  6. Geib, S.M.; Filley, T.R.; Hatcher, P.G.; Hoover, K.; Carlson, J.E.; Jimenez-Gasco, M.M.; Nakagawa-Izumi, A.; Sleighter, R.L.; Tien, M. (2008). "Lignin degradation in wood-feeding insects". Proceedings of the National Academy of Sciences of the United States of America. 105 (35): 12932–12937. Bibcode:2008PNAS..10512932G. doi:10.1073/pnas.0805257105. PMC 2529026. PMID 18725643.
  7. Rosengaus, R.B.; James, L.; Hartke, T.R.; Brent, C.S. (2011). "Mate preference and disease risk in Zootermopsis angusticollis (Isoptera: Termopsidae)". Environmental Entomology. 40 (6): 1554–1565. doi:10.1603/en11055.
  8. Rosengaus, R.B.; Traniello, J.F.A. (2001). "Disease susceptibility and the adaptive nature of colony demography in the dampwood termite Zootermopsis angusticollis". Behavioral Ecology and Sociobiology. 50 (6): 546–556. doi:10.1007/s002650100394.
  9. Howse, P.E. (1964). "The significance of the sound produced by the termite Zootermopsis angusticollis (Hagen)". Animal Behaviour. 12 (2–3): 284–300. doi:10.1016/0003-3472(64)90015-6.
  10. Brent, C.S.; Schal, C.; Vargo, E.L. (2005). "Endocrine changes in maturing primary queens of Zootermopsis angusticollis". Journal of Insect Physiology. 51 (11): 1200–1209. doi:10.1016/j.jinsphys.2005.06.009.
  11. Tai, V.; James, E.R.; Perlman, S.J.; Keeling, P.J. (2013). "Single-cell DNA barcoding using sequences from the small subunit rRNA and internal transcribed spacer region identifies new species of Trichonympha and Trichomitopsis from the hindgut of the termite Zootermopsis". PLOS One. 8 (14): 1–12. doi:10.1371/journal.pone.0058728. PMC 3594152. PMID 23536818.
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