Navigation Links
Invasive ants territorial when neighbors are not kin

A study led by University of California, San Diego biologists shows that invasive Argentine ants appear to use genetic differences to distinguish friend from foe, a finding that helps to explain why these ants form enormous colonies in California.

In the December issue of the journal Molecular Ecology, the biologists provide the first data on territorial interactions among Argentine ants in the field. In California, Argentine ants form expansive "supercolonies" containing millions of nests and stretching hundreds of miles. Researchers have disagreed on the reason for the lack of aggression between ants from different nests in the same colony.

"Some ecologists have hypothesized that environmental factors act to reduce aggression among Argentine ants in California," said David Holway, an assistant professor of biology at UCSD and senior author on the study. "However, we found that while ants from the same supercolony do not fight, clashes between ants from different supercolonies occur commonly along territorial borders."

The distance between nests did not play a role in ants' territorial behavior. Nor were there any obvious environmental clues to explain why ants would attack ants of the same species from one neighboring nest but not another. However, the researchers found a very close relationship between behavior and genetics. Ants that were genetically similar had peaceful relations. Ants that were genetically different attacked each other.

"Our results are strong evidence that lack of genetic diversity permits supercolonies to arise," said Melissa Thomas, who was a postdoctoral fellow working with Holway when she collected the data on territorial interactions. "Workers cannot differentiate between nestmates and non-nestmates if they all seem the same. So ants from different nests in the same colony do not fight with each other."

Five supercolonies of Argentine ants are known to occur in southern California. The largest supercolony extends about 600 miles throughout coastal California and abuts three of the four smaller colonies. At the territory borders, ants from different colonies engage in intense battles that result in the deaths of considerable numbers of workers. Thomas collected dead workers along small sections of the borders weekly. She estimated that border skirmishes around one of the smaller colonies, at Lake Hodges north of San Diego, killed at least 15 million workers over the six month study.

However, ants did not fight when placed with ants from a distant location in the same supercolony. Coauthors Christine Payne-Makrisâ and Andrew Suarez from the University of Illinois, Urbana and Neil Tsutsui from U.C. Irvine found that across the large geographical range of a supercolony ants were very genetically similar, but they were genetically distinct from ants in neighboring supercolonies. The researchers say that by keeping peace with their kin, the ants may be able to devote more resources to breeding rather than competing.

"Territory defense is expensive both in time and workers," explained Thomas, now a postdoctoral fellow at the University of Western Australia. "If nests invest this time and workforce into collecting resources and raising larvae instead of defending territories, then colonies should grow at a much faster rate."

In their native Argentina, aggressive interactions between colonies are much more common and colonies are significantly smaller. When Argentine ants were introduced to California 100 years ago, they spread widely because they did not encounter other colonies of Argentine ants. The biologists think that the distinct supercolonies in southern California arose from separate introductions of the ants, possibly in the soil of plants used in landscaping.

They hope that a better understanding of how the ants distinguish kin from non-kin, and the mechanisms that prevent gene flow between colo nies, might lead to more effective ways to control the ants. That would be good news for anyone surrounded by the pervasive creatures.

"When people saw that the ants from different supercolonies were fighting with each other, they were glad to know that things were moving in the right direction," quipped Holway.


'"/>

Source:University of California - San Diego


Related biology news :

1. Invasive parasite destroying fish species
2. Minimally Invasive Cancer Treatments Highlighted
3. Invasive species harms native hardwoods by killing soil fungus
4. Invasive exotic plants helped by natural enemies
5. Invasive species alter habitat to their benefit
6. National Academies advisory: Invasive aquatic species in the Great Lakes
7. Cultural transmission in bats: When listening for dinner, bats learn from their neighbors
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/20/2016)... , June 20, 2016 Securus Technologies, ... technology solutions for public safety, investigation, corrections and ... prisons involved, it has secured the final acceptance ... facilities for Managed Access Systems (MAS) installed. Furthermore, ... facilities to be installed by October, 2016. MAS ...
(Date:6/9/2016)... 2016 Paris Police Prefecture ... security solution to ensure the safety of people and operations ... the major tournament Teleste, an international technology group ... announced today that its video security solution will be utilised ... up public safety across the country. The system roll-out is ...
(Date:6/2/2016)... 2, 2016   The Weather Company , an IBM ... an industry-first capability in which consumers will be able to ... ask questions via voice or text and receive relevant information ... Marketers have long sought an advertising solution that ... be personal, relevant and valuable; and can scale across millions ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... 27, 2016  Global demand for enzymes is ... 2020 to $7.2 billion.  This market includes enzymes ... products, biofuel production, animal feed, and other markets) ... biocatalysts). Food and beverages will remain the largest ... consumption of products containing enzymes in developing regions.  ...
(Date:6/27/2016)... (PRWEB) , ... June 27, 2016 , ... ... to bring innovative medical technologies, services and solutions to the healthcare market. The ... implementation of various distribution, manufacturing, sales and marketing strategies that are necessary to ...
(Date:6/24/2016)... DIEGO , June 24, 2016 ... more sensitively detects cancers susceptible to PARP inhibitors ... circulating tumor cells (CTCs). The new test has ... HRD-targeted therapeutics in multiple cancer types. ... targeting DNA damage response pathways, including PARP, ATM, ...
(Date:6/23/2016)... CAMBRIDGE, Mass. , June 23, 2016 /PRNewswire/ ... the development of novel compounds designed to target ... compound, napabucasin, has been granted Orphan Drug Designation ... in the treatment of gastric cancer, including gastroesophageal ... cancer stemness inhibitor designed to inhibit cancer stemness ...
Breaking Biology Technology: