When planning your next picnic, make sure you leave the tuna
at home. University of Georgia entomologists have found several
ant species prefer tuna over other foods they tested.

“We did this study to find out what food products native
ants like best,” said Mark Brinkman, a research scientist
with the UGA College of Agricultural and Environmental
Sciences.

Unlike picnickers, entomologists want to attract ants.
“We want to find out how many species of ants are present in
Georgia,” Brinkman said. “Using food baits to collect ants is the
first step in this project.”

Tuna and Honey: The Top
Choices

For the study, Brinkman narrowed down the ant menu to tuna
in oil, uncooked eggs, honey and peanut oil. “Peanut oil
is a fat, honey is a sugar, egg is a protein and tuna is a
protein in oil,” he said. “I chose these foods to represent
several food groups.”

Brinkman said he decided to test eggs as a food bait because
of his observations in nature. “I have often seen them
eating bird eggs that have fallen out of nests,” he said.

After testing the food baits last summer, Brinkman found tuna
in oil to be the top choice of ants in Georgia. Of the more than
5,000 ants collected during the study, 4,594 were caught using
the tuna bait. Honey was the second favorite food bait attracting
some 355 ants and egg was the third choice attracting some 294
ants. Only 50 ants were caught in the peanut oil baits.

“The majority of the ants collected with tuna baits were
fire ants,” Brinkman said. “It’s not that other species
don’t like tuna, too. Once fire ants show up, they monopolize
a food bait.”

There’s More Than One Way to Catch
Ants

Brinkman’s study helps UGA entomologists lighten their load
when collecting ant species for research. “Now instead of
taking all these different food baits along, we take the tuna
baits,” he said.

Food baits, like the tuna one used by UGA researchers, may
prove to be very effective tools for attracting ants, but UGA
entomologists can’t rely on it alone. “We attracted 13
species of ants with the food baits and there may be a couple of
hundred species in Georgia,” Brinkman said.

To collect as many species as possible, UGA entomologists also
use pitfall traps to collect ants. “Basically, you drill
a hole in ground, insert a vial and the ants fall in,”
Brinkman said.

Researchers actively search for ants in nature, too, and
collect them in leaf litter samples. “We collect leaf litter, put
it in the top of a large funnel and heat it up,” he said.
“The ants fall down into a collecting station.”