News

Meat ants may curb cane toad population


31 March 2009

A meat ant dines on a cane toad.
A meat ant dines on a cane toad.

Ecologists in Australia have discovered that cane toads are far more susceptible to being killed and eaten by meat ants than native frogs. Their research - published in the British Ecological Society's journal Functional Ecology - reveals a chink in the cane toad's armour that could help control the spread of this alien and invasive species in tropical Australia.

Professor Rick Shine and his colleagues Georgia Ward-Fear, Matt Greenlees and Greg Brown, from the University of Sydney's Team Bufo (from the Latin name for the toxic toad), compared habitat use and activity patterns in meat ants, metamorph cane toads and seven native Australian frog species. They found that, unlike the native frogs, cane toads are poorly equipped to escape the meat ants.

According to Shine: "The spread of cane toads through tropical Australia has created major ecological problems. The ideal way to control toad numbers would be to find a predator that kills and eats toads but leaves native frogs alone. However, bringing in a predator from overseas might have catastrophic consequences, like those that occurred when cane toads themselves were brought in. So we've explored an alternative approach - to see if we could use a native predator. Meat ants are abundant around tropical water bodies, and we often see them eating small toads, so we suspected that there might be some kind of mismatch between the invader and its newly invaded range, for example something about the toads' behaviour that makes them vulnerable to a predator that poses little danger to native frogs."

Through a series of laboratory experiments, Team Bufo looked at when the ants, frogs and toads were most active, where they chose to live, and how good the frogs and toads were at escaping attacking meat ants. They found cane toads opt to live in open microhabitats and are active during the day, patterns that match those of meat ants. By contrast, native frogs are nocturnal and are safely ensconced in vegetation or other shelters during the day, when meat ants are on the hunt.

Cane toads are also less well-equipped to escape attacking meat ants, Team Bufo found. Using a specially built runway, they tested the frogs' and toads' sprint speed and endurance. They found that compared with the quick and nimble native frogs, cane toads' hops are shorter and slower due to their shorter shin bones. Native frogs were also more vigilant for meat ants than cane toads, they discovered.

The results are interesting not only because they reveal the cane toad's Achilles' heel - a weakness that could be exploited to help control the spread of the toxic toad - but because the same "evolutionary trap" could be used to snare invasive species elsewhere.

"The end result of this mismatch between traits of metamorph cane toads, which evolved in the Americas, and the ecological interaction between metamorph toads and meat ants in tropical Australia, is an 'evolutionary trap'. That is, characteristics that increased toad survival where they evolved in the Americas are now a disadvantage, because the toads are facing different challenges in Australia - challenges they have not evolved to deal with. Such evolutionary traps should be especially common for invasive species, because so many aspects of their environment differ from those in which the traits of that species evolved," says Shine.

Georgia Ward-Fear et al (2009). Maladaptive traits in invasive species: in Australia, cane toads are more vulnerable to predatory ants than are native frogs, Functional Ecology, doi: 10.1111/j.1365-2435.2009.01556.x, is published online on 31 March 2009.

Notes for editors

1. For further information and photos, please contact Professor Rick Shine, University of Sydney, tel: + 61 (02) 9351 3772, mob: + (61) 0417 247 573, email: rics@bio.usyd.edu.au.

2. Copies of the paper are available. For Australian media, contact Jacob O'Shaughnessy, Media Officer, University of Sydney, tel: +(61) 2 9351 4312, mob: +(61) 421 617 861, email: jacob@media.usyd.edu.au.
For other media, contact Becky Allen, British Ecological Society Press Officer, tel: +(44) 0 1223 570 016, mob: +(44) 0 7949 804 317, email: beckyallen@ntlworld.com.

3. The study was funded by the Australian Research Council, and was Georgia Ward-Fear's honours research project.

4. Cane toads (Bufo marinus) are large, highly toxic toads native to Central and South America. Since being introduced to north-eastern Australia in 1935 for biological control of beetles threatening sugar cane crops, they have spread across most of tropical Australia. As native predators cannot tolerate their toxins, cane toads kill carnivorous marsupials, lizards, snakes, crocodiles and frogs. For more information on cane toads, and Professor Rick Shine's research group Team Bufo, see www.canetoadsinoz.co m

5. Functional Ecology is published by Wiley-Blackwell for the British Ecological Society. Contents lists are available at Wiley Interscience.

6. The British Ecological Society is a learned society, a registered charity and a company limited by guarantee. Established in 1913 by academics to promote and foster the study of ecology in its widest sense, the Society has 4,000 members in the UK and abroad. Further information is available at the British Ecological Society.