'Bone-house wasp' uses dead ants to protect their nest

Jul 02, 2014
A 'bone house' wasp nest protection overview Credit: Staab et al, doi:10.1371/journal.pone.0101592

A new species of spider wasp, the 'Bone-house Wasp,' may use chemical cues from dead ants as a nest protection strategy, according to a recent study published July 2, 2014 in the open-access journal PLOS ONE by Michael Staab from University of Freiburg, Germany, and his colleagues from China and Germany.

Wasps use a wide variety of nest protection strategies, including digging holes or occupying pre-existing cavities such as in wood. Previous studies showed that the of cavity-nesting wasps contain several brood cells separated by thin walls of plant debris, resin, or soil. Once the females have finished constructing the nest, laying eggs, and providing food, they construct an outermost vestibular cell to close the nest.

After construction, female wasps abandon the brood and do not care for their offspring anymore. Nest protection strategies play a central role in survival, and in this study, scientists interested in better understanding these strategies collected ~800 nests of cavity-nesting wasps with ~1900 belonging to 18 species in South-East China. The scientists found a nesting behavior previously unknown in the entire animal kingdom: in over 70 nests they found an outer vestibular cell filled with dead ants. The species constructing these ant-filled vestibular cell was so far unknown to science and was described in the same study as the 'Bone-house Wasp' (Deuteragenia ossarium), after graveyard bone-houses or ossuaries.

The scientists also found lower parasitism rates in "Bone-house" nests than in nests of similar cavity-nesting . The authors suggest that D. ossarium nests are less vulnerable to natural enemies, potentially supporting the outer cell's role in defense, which most likely involves emanating from the dead ants used as nest-building material.

Explore further: Birds outsmart wasps to feed young

More information: Staab M, Ohl M, Zhu C-D, Klein A-M (2014) A Unique Nest-Protection Strategy in a New Species of Spider Wasp. PLoS ONE 9(7): e101592. DOI: 10.1371/journal.pone.0101592

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