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Home , Fire ant, Honeydew (secretion), Nylanderia, Rasberry crazy ant

Invasive : Risks and Pathways Project TAWNY CRAZY UPDATED: APRIL 2020

Invasive insects are a huge biosecurity challenge. We profile some of the most harmful invaders overseas to show why we must keep them out of .

Species Tawny crazy ant / fulva. Also known as fulva, , hairy crazy ant. Main impacts Dominates ecosystems, eating invertebrates, displacing other , attacking mammals and birds, tending -sucking bugs that harm plants, and spreading plant diseases. Invades homes and gardens, causes electrical malfunctions in businesses and homes, spreads pathogens in hospitals, harms and crops. Native range .1 Invasive range Colombia, Peru, Mexico, Panama, Caribbean islands, .2,3 Main pathways of global spread Unknown.

ENVIRONMENTAL IMPACTS OVERSEAS Tawny crazy ant pupae and worker. Photo: Alex Wild and Ed Le Brun The tawny crazy ant displaces other ants ants also invade forested habitats in high eradication effort in Australia, justified – in Colombia it displaces 9 of 14 native densities, so they threaten more habitats4. partly by impacts of this nature. species1 and in colonised sites in it has attained within a year ‘densities up to The impacts of tawny crazy ants on Another problem is that tawny crazy ants 2 orders of magnitude greater than the wildlife other than ants have not been protect sap-sucking bugs from which combined abundance of all other ants’4. studied, but they are suspected to be they obtain . In Colombia this In some locations in the United States, it serious, based on observations in Texas has led to desiccation of grasslands due 7 is replacing (in much higher densities) the and Colombia. Texas A&M University to excessive numbers of bugs . In the invasive red imported ant Solenopsis( reports that the ants irritate wildlife, and Caribbean it has resulted in a coconut invicta)4. It can outcompete the that masses covering the ground and plantation producing no coconuts due to by capturing more prey and is able to trees ‘likely affect ground and tree- high densities of ant-tended bugs on the detoxify the fire ant venom1. Fire ants in nesting birds and other small flowers and young fruit causing them to 8 the United States are considered a very and cause wildlife to move out of the drop prematurely . The ants also increase serious problem for , for their area’6. On farms in Colombia the ants the incidence of diseases on crops, 8 attacks on invertebrates, reptiles and kill chickens and other small livestock by including viral and fungal infections . ground-nesting birds5, and the concern is blocking their nasal passage, and they Although the evidence is from crops, that tawny crazy ants, a far newer arrival attack cattle around the eyes, nose and there is no reason to doubt that some in the United States, could rival or exceed hoofs, blinding calves7. These match the native plants would be affected in the them as a threat1. Fire ants are restricted behaviour in the United States of fire same way. to disturbed habitats, while tawny crazy ants5, which are subject to an expensive

INVASION WATCH: Tawny crazy ant The tawny crazy ant is a 2.6-3 mm long, hairy, golden-brown to reddish-brown ant. Photo: Michael Bentley | Flickr | CC BY-NC-ND 2.0

HUMAN AND AUSTRALIAN Imported crazy ant displaces imported fire ant, reduces and homogenizes grassland ant and ECONOMIC IMPACTS CONCERNS assemblages. Biological Invasions. OVERSEAS This ant is likely to be a serious threat 15: 2429–2442. In Colombia high population densities to Australian biodiversity, given that 5. Vinson SB (1997): Invasion of the red make this species ‘a formidable climate modelling indicates high climatic imported fire ant (: Formicidae): spread, biology, and impact. American household ’7. In Texas it has become a suitability in subtropical eastern Australia Entomologist. 43: 23–39. serious pest in homes (invading kitchens, and some climatic suitability across a baths and taps) and gardens. People much larger area, including most of New 6. Texas A&M University (n.d.): Tawny 3 (rasberry) crazy ant, Nylanderia fulva. Urban and their pets are uncomfortable in their South Wales, Victoria and Tasmania . and Structural Entomology Program at Texas yards6 and pets behave abnormally9. Having invaded intact floodplain forest and native pasturelands in Texas4, this A&M University. Retrieved from https:// Unlike fire ants, these ants lack a painful urbanentomology.tamu.edu/urban-pests/ants/ ant could be expected to invade natural sting but, even so, many residents dislike rasberry/. 6 habitats in Australia. Ecological impacts them more than fire ants . They are are likely due to displacement of native 7. McDonald DL (2012): Investigation of an costly and difficult to control, with no invasive ant species: Nylanderia fulva colony 9 ant species, predation of small animals treatments proving satisfactory . extraction, management, diet preference, and protection of sap-sucking bugs. fecundity, and mechanical vector potential. Ph.D Tawny crazy ants cause costly damage These could be severe, as suggested thesis, College Station: Texas A&M University. to electrical equipment, short-circuiting by the ability of the tawny crazy ant to 8. Wetterer JW, Keularts JLW (2008): Population telephones, computers, air conditioning 1 outcompete the . explosion of the hairy crazy ant, Paratrechina units, pool pumps, electrical boxes and pubens (Hymenoptera: Formicidae), on St. 6,9 An incursion could be difficult to sewage lift pump stations . They have Croix, US Virgin Islands. Florida Entomologist. 9 eradicate. In Texas, after the species caused power outages in entire streets . 91: 423–427. was first detected by a The ants are also a medical concern. operator in 2002, new populations arose 9. Meyers JM (2008): Identification, distribution, They invade hospitals, and experiments at alarming rates, and no satisfactory and control of an invasive pest ant, Paratrechina sp. (Hymenoptera: Formicidae), in Texas. PhD showed them capable of transferring method of controlling them was found9. the bacterium Escherichia coli after thesis, College Station: Texas A&M University. acquiring it from a contaminated source7. Pyrosequencing indicated a suite of SOURCES ABOUT THIS PROJECT 518 bacteria and 135 fungi species 1. Wang Z, Moshman L, Kraus E, Wilson B, The Invasive Insects: Risks and associated with this ant, many of them Acharya N, Diaz R (2016): A review of the Pathways Project is a partnership known pathogens of plants, animals and tawny crazy ant, Nylanderia fulva, an emergent between Monash University and the Invasive 7 ant invader in the southern United States: humans . Because there is no way to Species Council. To find out more visit is biological control a feasible management keep them out of hospitals, they should invasives.org.au/risks-and-pathways. be regarded as a medically important option? Insects. 7: 77. species7. 2. Eyer P-A, McDowell B, Johnson LNL, Calcaterra LA, Fernandez MB, Shoemaker D, et In Colombia and the Caribbean these al. (2018): Supercolonial structure of invasive ants are agricultural pests, killing populations of the tawny crazy ant Nylanderia chickens, blinding calves, reducing crop fulva in the US. BMC Evolutionary Biology. 18: yields, spreading crop diseases and 209. drying pastures5,7,8. Their protection of 3. Kumar S, LeBrun EG, Stohlgren TJ, Stabach sap-sucking bugs has caused damage JA, McDonald DL, Oi DH, LaPolla JS (2015): to coffee crops in South America and Evidence of niche shift and global invasion coconut crops in the Caribbean1. In Texas potential of the tawny crazy ant, Nylanderia they have caused bees to abandon fulva. Ecology and Evolution. 5: 4628–4641. hives7. 4. LeBrun EG, Abbott J, Gilbert LE (2013):

INVASION WATCH: Tawny crazy ant