Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Aussie Wasp on the Hunt for Redback Spiders

12.09.2012
University of Adelaide researchers say a small wasp that scientists had forgotten about for more than 200 years is now making a name for itself – as a predator of Australia's most common dangerous spider, the redback.

The wasp (Agenioideus nigricornis) was first described scientifically in 1775 by Danish entomologist Johan Christian Fabricius, thanks to samples collected in Australia during Captain Cook's first great voyage (1768–1771).

"Since then, scientists have largely forgotten about the wasp," says Professor Andy Austin from the University of Adelaide's Australian Centre for Evolutionary Biology & Biodiversity. "It is widespread across Australia and can be found in a number of collections, but until now we haven't known the importance of this particular species."

The wasp is now being dubbed the "redback spider-hunting wasp" after a family in Beaconsfield, Western Australia, discovered one of them with a paralyzed redback spider in their back yard.

Florian Irwin, then aged 9, spotted the wasp dragging the spider several meters to its nest, and his father, Dr Peter Irwin, photographed the event and kept the specimens. Peter, who is an Associate Professor at Murdoch University, contacted the Western Australian Museum about the discovery; the Museum alerted Professor Austin and research fellow Dr Lars Krogmann at the University of Adelaide.

"The Museum knew we were doing research into the Agenioideus, which belongs to the family Pompilidae, the spider-hunting wasps. Little is known about them, despite various species of Agenioideus being distributed throughout the world," Professor Austin says.

"We're very excited by this discovery, which has prompted us to study this species of wasp more closely. It's the first record of a wasp preying on redback spiders and it contributes greatly to our understanding of how these wasps behave in Australia."

With a body less than a centimeter in length, an adult redback spider-hunting wasp is no bigger than its prey. It stings and paralyses the redback spider and drags it back to its nest, where the wasp lays an egg on it. The spider remains alive but is paralyzed. Once the egg hatches, the larval wasp feeds on the spider.

The redback spider (Latrodectus hasselti) is an Australian relative of North America's black widow spider.

"The redback spider is notorious in Australia, and it has spread to some other countries, notably Japan and New Zealand. Redbacks are one of the most dangerous species in Australia and they're mostly associated with human dwellings, which has been a problem for many years," Professor Austin says.

"The redback spider-hunting wasp is doing its part to keep the population of redback spiders down, but it doesn't hunt all the time and is unlikely to completely eradicate the spiders."

Dr Krogmann (who is now based at the Stuttgart State Museum of Natural History) and Professor Austin have published a paper about the redback spider-hunting wasp in this month's issue of the Australian Journal of Entomology.

Professor Andy Austin
Australian Centre for Evolutionary Biology & Biodiversity
Environment Institute
The University of Adelaide
Cell phone: +61 438 378 151
andy.austin@adelaide.edu.au

Professor Andy Austin | Newswise Science News
Further information:
http://www.adelaide.edu.au

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling of PET Bottles: New Ideas for Resource Cycles in Germany
25.06.2018 | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

nachricht Dry landscapes can increase disease transmission
20.06.2018 | Forschungsverbund Berlin e.V.

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Subaru Telescope helps pinpoint origin of ultra-high energy neutrino

16.07.2018 | Physics and Astronomy

Barium ruthenate: A high-yield, easy-to-handle perovskite catalyst for the oxidation of sulfides

16.07.2018 | Life Sciences

New research calculates capacity of North American forests to sequester carbon

16.07.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>