Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ants create united Europe

16.04.2002


Argentine ants are a serious agricultural and domestic pest in Europe.
© Charles König


Cooperation is a better strategy than conflict for expat Argentine ants.
© Charles König


Invading insect empire stretches 6,000 kilometres.

An invading empire has conquered Europe. One super-colony of South American ants, with millions of nests and billions of individuals, stretches 6,000 kilometres around the Mediterranean and Atlantic coasts, researchers have found.

Every ant in the colony treats every other as its nest-mate - even though they may be quite unrelated. The nests have buried their differences to create the largest cooperative unit ever discovered, say Laurent Keller of the University of Lausanne, Switzerland, and his colleagues1.



"You can mix Spanish and Italian ants and there’s no aggression," says Keller. "We were extremely surprised to find this."

"This is really amazing and exciting," says entomologist Terrence McGlynn of the University of San Diego. The cooperative powers of Argentine ants (Linepithema humile) have made them a serious agricultural and domestic pest, and a threat to native species worldwide. But the scale of their super-colonies, and how they came about, was previously unknown, says McGlynn.

Other invasive ants, such as the troublesome fire ants of the southern United States, cooperate, although not on the same scale. "To understand how they do it is practically, as well as biologically, important," says geneticist Pekka Pamilo of the University of Oulu, Finland.

The Argentine ant has invaded every continent except Antarctica, and has reached islands including Hawaii and New Zealand, by hitchhiking with humans. Its arrival is bad news for the residents - it’s very hard to find native ants in invaded areas, says McGlynn.

In the long term, Keller suggests, chemicals could be devised that jam the ants’ communication systems so that they turn on one another.

Suspension of hostilities

Keller and his colleagues collected Argentine ants from the northwest corner of Italy, along the south coast of France, and around the Iberian peninsula, ending at the northwest corner of Spain.

In South America, ants from nests a few metres apart fight to the death. Most European ants showed no aggression towards each other, even when their homes were thousands of kilometres apart.

This suspension of hostilities allows nests to crowd together, the team speculates. Freed from the predators and parasites of their homeland, populations reach higher densities. Cooperation becomes a better strategy than conflict, even though the ants are not related, and so share no evolutionary interest in each other’s wellbeing.

Ants use chemical badges to recognize nest-mates. Keller speculates that after the ants arrived in Europe in the 1920s, they teamed up with unrelated ants that happened to share a badge in order to achieve domination.

Argentine ants have not quite achieved European unification, however. The researchers found that the nests they collected fell into two blocs that cooperated amongst themselves but showed each other no quarter. The second, smaller super-colony lives in Catalonia, Spain.

References

  1. Giraud, T., Pedersen, J.S. & Keller, L. Evolution of supercolonies: the Argentine ants of southern Europe. Proceedings of the National Academy of Sciences, 412, 708 - 712, (2002).

JOHN WHITFIELD | © Nature News Service

More articles from Life Sciences:

nachricht Nanoparticle Exposure Can Awaken Dormant Viruses in the Lungs
16.01.2017 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Cholera bacteria infect more effectively with a simple twist of shape
13.01.2017 | Princeton University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Energy-Efficient Building Operation: Monitoring Platform MONDAS Identifies Energy-Saving Potential

16.01.2017 | Trade Fair News

Designing Architecture with Solar Building Envelopes

16.01.2017 | Architecture and Construction

Sensory Stimuli Control Dopamine in the Brain

13.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>