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Many animal species ‘play dead’ or feign death (in some cases called tonic immobility) as a defence strategy against predators, including some ants, although triggers and durations are poorly understood. We repeatedly observed such death-feigning behaviour in Polyrhachis femorata ants that occupied pygmy-possum nest boxes deployed on Kangaroo Island following the 2019–2020 bushfires that burnt half of the island. Most of the 759 bat and pygmy-possum boxes (901 cavities) were on burnt ground. In 3312 box cavity checks on 13 diverse properties during monitoring visits, 28 of 40 P. femorata records (first for South Australia) occurred in unburnt Critically Endangered Narrow-Leaf Mallee Woodland community, seven in adjacent mallee community containing narrow-leaf mallee, three in cup gum unburnt habitat, and two in one box on burnt ground. Fire may have affected the abundance and re-establishment of the species. Polyrhachis femorata engages in a surprising defensive immobility strategy in boxes, since it is not only undertaken by individuals facing a potential predator, but also by entire colonies. The death-feigning behaviours were complemented by plugging box entrances. Nest boxes may be used to study this mysterious behaviour in this poorly known species, although frequent observation could lead to nest abandonment by the ant.
References
Andersen AN (1991) ‘The Ants of Southern Australia – A Guide to the Bassian Fauna.’ (CSIRO Publishing: Melbourne, Vic., Australia)Andersen, AN, Penman, TD, Debas, N, and Houadria, M (2009). Ant community responses to experimental fire and logging in a eucalypt forest of south-eastern Australia., 188–197.| | |Australian Government (2014) Kangaroo Island Narrow-leaved Mallee () Woodland: a nationally-protected ecological community. Department of Environment, Canberra, ACT, Australia. Available at https://www.awe.gov.au/environment/biodiversity/threatened/publications/kangaroo-island-mallee-eucalyptus-cneorifolia-woodland-ecological-community-factsheet [Accessed 19 June 2022]Ayre, GL (1959). Food habits ofCreighton (Hymenoptera: Formicidae) at Westbank, British Columbia., 105–114.| | |Bourman RP, Murray-Wallace CV, Harvey N (2016) ‘Coastal Landscapes of South Australia.’ (University of Adelaide Press: Adelaide, SA, Australia)Brandão, CRF, Diniz, JLM, and Tomotake, EM (1991).strips millipedes for prey: a novel predatory behaviour in ants, and the first case of sympatry in the genus (Hymenoptera: Formicidae)., 335–344.| | |Cardoso, DC, Cristiano, MP, da Costa-Milanez, CB, and Heinze, J (2016). Agro-predation byants onfungus-growing ants., 483–486.| | |Cassill, DL, Vo, K, and Becker, B (2008). Young fire ant workers feign death and survive aggressive neighbors., 617–624.| | |Diniz, JLM, and Brandão, CRF (1993). Biology and myriapod egg predation by the Neotropical myrmicine ant(Hymenoptera: Formicidae)., 301–311.| | |Dornhaus A, Powell S (2010) Foraging and defence strategies. In ‘Ant Ecology’. (Eds L Lach, CL Parr, KL Abbot) pp. 210–230. (Oxford University Press: Oxford, UK)Heterick BE (2009) ‘A guide to the ants of South-western Australia.’ (Records of the Western Australian Museum Supplement No. 76) https://doi.org/ 10.18195/issn.0313-122x.76.2009.007-206 Humphreys, RK, and Ruxton, GD (2018). A review of thanatosis (death feigning) as an anti-predator behaviour., 22.| | |IBM Corp. (2021) ‘IBM SPSS statistics for windows, version 28.0.’ (IBM Corp.: Armonk, NY, USA)Kannowski, PB (1959). The flight activities and colony-founding behavior of bog ants in southeastern Michigan., 115–162.| | |Katayama, M (2013). Predatory behaviours of(Proceratiinae) on spider eggs., 121–124.Mbenoun Masse, PS, Kenne, M, Mony, R, Dejean, A, and Tindo, M (2011). Initial behavior in colony fragments of an introduced population of the invasive ant, 572–576.| | |Miyatake T (2021) Environmental, physiological, and genetic effects on tonic immobility in beetles. In ‘Death-feigning in Insects – Mechanism and Function of Tonic Immobility’. Entomology Monographs. (Ed. M Sakai) pp. 39–54. (Springer Nature Singapore Pte Ltd: Singapore)Miyatake, T, Nakayama, S, Nishi, Y, and Nakajima, S (2009). Tonically immobilized selfish prey can survive by sacrificing others., 2763–2767.| | |Parmentier, T, Dekoninck, W, and Wenseleers, T (2014). A highly diverse microcosm in a hostile world: a review on the associates of red wood ants (group)., 229–237.| | |Pasteur, G (1982). A classificatory review of mimicry systems., 169–199.| | |Peters B (2021) Mechanisms behind the death feigning behaviour inin the Cape Floristic Region, Western Cape, South Africa. Master’s Thesis, Stellenbosch University, South Africa.Petit S, Stonor MB (2022)feign death. (Kangaroo Island Research Station.) Available at https://www.kiresearchstation.org/publications/polyrhachis [Accessed 17 July 2022]Petit, S, Stonor, MB, Weyland, JJ, Gibbs, J, and Amato, B (2020).ants mine sand for vertebrate urine to extract nitrogen., 168–176.| | |Petit, S, Weyland, JJ, Brumley, C, Kehoe, MA, and Wang, C (2022). First record ofin Australia, tended by native ants on, 137–141.| | |Rakotonirina, JC, and Fisher, BL (2013). Revision of the-group (Hymenoptera: Formicidae) from the Malagasy region., 101–141.| | |Sakai M (2021) Freezing and tonic immobility: their definitions and naming. In ‘Death-feigning in Insects – Mechanism and Function of Tonic Immobility’. Entomology Monographs. (Ed. M Sakai) pp. 1–14. (Springer Nature Singapore Pte Ltd: Singapore)Saunders, ME, Barton, PS, Bickerstaff, JRM, Frost, L, Latty, T, Lessard, BD, Lowe, EC, Rodriguez, J, White, TE, and Umbers, KDL (2021). Limited understanding of bushfire impacts on Australian invertebrates., 285–293.| | |Schumacher, A, and Whitford, WG (1974). The foraging ecology of two species of Chihuahuan desert ants:and(Hymenoptera Formicidae)., 317–330.| | |Wilson, EO, and Brown, WL (1984). Behavior of the cryptobiotic predaceous ant, n. sp. (Hymenoptera: Formicidae: Basicerotini)., 408–428.| | |