Ant behavior: October 2012 Archives

Hi!

I am Natalie, I'm in 8th grade in chicago and i Am doing science fair, I am putting ibuprofen in ants food and drink. My question is: Will trace amounts of ibuprofen affect the behavioral patterns of red harvester ants? I have both on my ant farms set up, and 15 ants in each, I just would like some help along the way so i can do a great science fair!

Thanks and hope to hear from you soon.
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Dear Natalie,

We are glad to hear that you are participating in a science fair and that you are planning to include ants in your experiment. Regarding the experiment you are planning to conduct, here are a few things to consider:

- How will you measure the behavioral patterns of the ants to see if they are different? There are many ways to do this, but you will want to come up with some way to standardize your measurements. Will it be how much food they consume and how will you determine this? How often the ants are active versus not moving for specific periods of time that you are watching them? How often do the ants engage in different behaviors between the treatments (grooming themselves, grooming other ants, etc.)? There are lots of observations you could make, just be sure to decide ahead of time what you will do. One idea might be to just spend some time watching your ants before starting the experiments to get ideas.
- To insure that you are measuring the effect of the ibuprofen, you will need to have a "control", which in your case would be a group of ants that you are not feeding ibuprofen, but otherwise are treated and fed exactly the same. This will allow you to determine if the ibuprofen is what is causing the differences.
- You would ideally also like to have multiple pairs of ants that are and are not fed ibuprofen (but I realize this may not be possible for your project this year).

We hope this helps and have fun watching your harvester ants! Harvester ants from the genus Pogonomyrmex are beautiful animals (to see what they look like up close click here).

Enjoy,
Corrie Moreau & the AntAsk Team

Hi -- I was visiting Guarulhos in Brazil recently, and I found these ants in a tree or bush interacting with other insects. I suppose they are Camponotus atriceps or Camponotus mus and the insects probably a kind of cicada. I have to send the picture to a outdoor photography magazine and I need the Latin name, at least the genus. The picture was taken at the gardens of the Cesar Palace Hotel near to the international airport. One of the photos is of what looks like to be the nest. Can you get to me information about the other insect or the plant?

Thanks.

Javier Castosa, Madrid, Spain

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Dear Javier:

First, the bad news. I am sorry to say I cannot identify the plant in the pictures.

On the other hand, from the perspective of the AskAnt Team, you are really fortunate to have traveled to Brazil, one of the most ant-rich places in the world, where even an urban hotel garden can reveal fascinating aspects of ant behavior. The ants in your pictures are a species common both in the wild savannas and in gardens of that part of Brazil, namely Camponotus rufipes. (C. atriceps is a litttle smaller, and much shinier, and C. mus is considerably smaller with whiter hairs). When their nest is disturbed, C. rufipes can be very aggressive, delivering a strong bite into which they may squirt caustic formic acid. I had one draw blood from my finger one time, when I was doing field work in Brazil! It is one of the few ants that can do this.

The ants in your lovely pictures are associated with two types of sap-feeding insects, scale insects (round and featureless, Hemiptera: Coccidae) and planthoppers (colorful and cicada-like, Hemiptera: Fulgoroidea). Both of these animals excrete excess sugar and water from their plant sap diet in the form of honeydew (melaza in Spanish). Like many ants, C. rufipes is fond of sugar, and lingers around the honeydew "factory" to gather this waste product as it is produced by the sap-feeding bugs. you could say that one insect's garbage is another insect's treasure! The honeydew bugs in this relationship are sometimes referred to as ant-cattle. The ants also defend the bugs from parasites, predators, and competing ants.

This ant is known to make a nest of cut grass, a picture of which can be seen at the link in the next paragraph. Out in the savanna, this ant may nest in low, wet areas, and its nests may be suspended among grass stalks above the saturated ground, looking something like birds' nests. As your second picture shows, the ants also use bits of grass to build structures covering their "cattle", an additional way to shelter them from enemies. Partly chewed and glued-together plant fibers used by ants for construction are referred to as carton.

Here's a post about C. rufipes at one of our favorite blogs: http://myrmecos.net/2012/06/13/answer-to-the-monday-night-mystery-camponotus-rufipes/. Another post at the myrmecos blog lists this ant as the 48th most published ant species (among over 12,000 species to choose from). Your intention to publish these photos in an outdoor magazine will make them just a little bit more well-published.

James C. Trager & the AskAnt Team


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