Researchers have shown for the first time how Golden orb web spiders (Nephila antipodiana) add a chemical to their web silk to repel invading ants.
The finding adds a chemical defense to the impressive properties of spider silk, already known to be very strong, elastic and adhesive, and may provide new opportunities for pesticide design.
The study was led by researchers from the National University of Singapore (NUS) and the University of Melbourne, and is published in the journal Proceedings of the Royal Society B today [Wednesday, 23 November 2011].
Associate Professor Daiqin Li, who led the team at the National University of Singapore, said that ants rarely occur on the web of orb web spiders, despite their abundance, so his team set out to discover why.
"We found that large Golden orb web spiders add a defensive alkaloid chemical onto the silk, which stops the ants from walking onto the web when they come into contact with it," said Assoc Prof Li from the Department of Biological Sciences, NUS.
Professor Mark Elgar from the University of Melbourne's Department of Zoology said the team was impressed by the strength of the ant repellent in the web silk.
"The type of chemical deterrent found in the spider silk is known as a pyrrolidine alkaloid, which acts as a predator deterrent in many species of ants, moths and caterpillars," Prof Elgar said.
The team found that only large Golden orb web spiders produce the defensive compound, suggesting that the younger, smaller spiders could rely on their thinner web silk to physically prevent ants being able to climb into their webs.
They made the discovery by allowing the Golden orb web spider to spin webs in the lab and then analyzing the compounds in the silk. Once the defensive alkaloid compound was identified, the researchers observed the behaviour of ants in its presence.
"The orb spider is potentially vulnerable to attack from groups of ants while sitting in its web waiting for prey, so the chemical defense in web silk may have evolved to not only protect the spider, but to reduce the time and energy that would otherwise be required to chase away invading ants," said Prof Elgar.
The Golden orb web spider is typically found in the forests of Australia, Asia, Africa and America.
Pictures of orb spiders are available upon request.
For more information:
National University of Singapore:
Mr Ng Swee Kang, NUS Office of Corporate Relations
P:65-65165125; M: 65-98431651; E: sweekang@nus.edu.sg
Assoc Prof Daiqin Li:
P:65-6516 4372 M:65-9622 5256 E: dbslidq@nus.eud.sg
University of Melbourne:
Dr Nerissa Hannink, UoM Media Office
P: 613-8344-8151 M: 61-430-588-055 E: nhannink@unimelb.edu.au
Prof Mark Elgar:
P:613-8344-4338 M: 61-417-545-889 E: m.elgar@unimelb.edu.au
About National University of Singapore (NUS)
A leading global university centred in Asia, the National University of Singapore (NUS) is Singapore's flagship university which offers a global approach to education and research, with a focus on Asian perspectives and expertise.
NUS has 16 faculties and schools across three campuses. Its transformative education includes a broad-based curriculum underscored by multi-disciplinary courses and cross-faculty enrichment. Over 36,000 students from 100 countries enrich the community with their diverse social and cultural perspectives.
NUS has three Research Centres of Excellence (RCE) and 21 university-level research institutes and centres. It is also a partner in Singapore's 5th RCE. NUS shares a close affiliation with 16 national-level research institutes and centres. Research activities are strategic and robust, and NUS is well-known for its research strengths in engineering, life sciences and biomedicine, social sciences and natural sciences. It also strives to create a supportive and innovative environment to promote creative enterprise within its community.
For more information, please visit http://www.nus.edu.sg
About University of Melbourne
The University of Melbourne has been an international leader in research, teaching and learning for more than 150 years. Ranked 37th in the world by the Times Higher Education's World University Rankings, Melbourne is the highest ranked university in Australia. At Melbourne, more than 6500 staff support a vibrant student community of more than 49,000, including about 12,200 international students from 129 countries.