Carpenter Ants

Ants Need Work-Life Balance

By | Carpenter Ants, Fire Ants, Pests | No Comments
Credit: © corlaffra / Fotolia

Credit: © corlaffra / Fotolia

As humans, we constantly strive for a good work-life balance. New findings by researchers at Missouri University of Science and Technology suggest that ants, long perceived as the workaholics of the insect world, do the same. In fact, according to these researchers, it is imperative that some ants rest while others work to conserve food, energy and resources for the colony. And the larger the colony, the more important this work-rest balance becomes.

“It has been a long-standing question in the field as to why large colonies of ants use less per-capita energy than small colonies,” says Dr. Chen Hou, assistant professor of biological sciences at Missouri S&T and research team lead. “In this work, we found that this is because in large colonies, there are relatively more ‘lazy workers,’ who don’t move around, and therefore don’t consume energy.

“We found that the portion of inactive members of a group increases in a regular pattern with the group size,” Hou says.

The research team consistently observed that 60 percent of workers were not moving around in a 30-ant group, whereas this percentage increased to 80 percent when the group size increased to 300 ants.

“The simultaneous energetic measurements showed that the per capita energy consumption in the 300-ant group is only 50 percent of that in the 30-ant group,” Hou says.

By not consuming energy, these “lazy” ants are actually saving resources for the colony and making the colony more productive.

This realization could provide valuable insight into making our societies more productive and sustainable.

“Humans are like ants in a way that we all live together in groups, collaborating toward our own betterment,” Hou says. “Both humans and ants face similar problems of allocating resources based on tasks and energy. Understanding how ants spend their energy in relation to their group and why they do so will provide insight into conditions for individuals that allow a group to perform collective optimization of behavior, that is, in the context of sustainable use of scarce resources.”

Hou and his team, which includes two undergraduate Missouri S&T students, discuss their findings in a forthcoming issue of the journal Insect Science.

“Maximizing resource acquisition would require most individuals to be highly active, but would also result in high energy expenditure and long average foraging time. In contrast, minimizing time and energy expenditure would require most individuals to be inactive, but would also result in low resource acquisition,” Hou says. “Thus, we postulate that ant colonies balance these two optimization rules by the coordination of the forager’s interaction.”

Hou says his team came to its conclusion using a state-of-the-art computerized vision analysis program to track the motion trajectories of ants. His colleague, Dr. Zhaozheng Yin, assistant professor and Daniel C. St. Clair Fellow of computer science at Missouri S&T, developed the program.

Using Yin’s automatic algorithm, the research team was able to analyze the movements of ants over longer periods of time and higher temporal resolution than had ever previously been conducted. Previous studies had only analyzed the movements of ants in minute-long intervals. The analysis of a two-hour-long video by the research team showed a large variation in the average walking speed of ants in the colony, from .2 centimeters a second to 1.4 centimeters a second.

“This indicates it is likely that the analyses of one-minute observations give only momentary snapshots, and may not well represent the ants’ behaviors over long periods,” says Hou. “These comparisons highlight the advantage of our automatic computerized tracking technique, because it is difficult, if not possible, to manually digitize coordinates of individual ants with high temporal resolution over a long period.”

By tracking ants’ walking behaviors over longer periods of time, the researchers also determined how much energy ants consume while working as opposed to resting.

“We found that walking ants consume five times more energy than resting ants,” says Hou. “This means that energy wise, one walking ant is equivalent to five resting ants. Thus, if a group has 20 percent active members, this group would consume 180 percent more energy than a similar sized group with all inactive members.”

The research team, which also includes sophomore Nolan Ferral and junior Kyara Holloway, both biological sciences majors at Missouri S&T, and Mingzhong Li, a Ph.D. student in computer science, shared its findings in an article titled “Heterogeneous activity causes a nonlinear increase in the group energy use of ant workers isolated from queen and brood.” The article will be published in an upcoming issue of Insect Science.

“It is intuitive that colonies have inactive members, because these members may serve a backup role or buffer, which would be activated when colonies are under stress, such as an urgent need for nest maintenance or defense,” says Hou. “But it is unclear why the proportion of the inactive members is not a constant — why larger colonies have relatively more ‘lazy’ workers. Thus, our study calls for future research on ant interaction networking and behaviors.”

Article Courtesy of

The Truth About Carpenter Ant Swarms

By | Carpenter Ants, Pests | No Comments

Reproductive CAThe Pacific Northwest climate is well suited for carpenter ants.  It is not surprising that these wood nesting ants are the number one structural wood destroying insect pest in Washington State. 

So how concerned should home owners be when they see these large winged creatures each spring invading their property?

Mature carpenter ant colonies have a main nest and one or more associated satellite nests. Main nests can be found in living conifer trees, stumps, landscape timbers, firewood, and most any sizable wood debris in contact with the soil. Main nests need wood with a high moisture content to survive.  In contrast, Satellite nests can utilize dry wood such as the timbers of a structure. Most homes damaged by carpenter ants are a result of infestation by satellite nests.

Each spring, mature colonies send out thousands of new queen ants in swarms to establish new main nests.  These black swarming ants, sometimes one inch in length, are called reproductives; they fly short distances before losing their wings and begin wandering for new homes.  Only a small fraction of these winged reproductive ants survive to create new colonies. 

Since these budding queens need wood with high moisture content, most well-maintained homes due not fulfill the moisture needs and are therefore not capable of being a main nesting site.  In April and May, homeowners should not be overly alarmed when observing these large ants crawling in the landscape or occasionally in the house, especially if your home is routinely serviced for pest prevention.


In contrast, if you observe large numbers of winged ants clustering together inside your home or smaller, wingless black ants trailing in regular patterns inside or outside of your home, this may indicate an established carpenter ant satellite nest in the home, requiring an inspection by a qualified licensed pest management professional.

For those without regular pest control service, the month of May is an excellent time for an annual