Comanche Harvester Ant Harvests Yucca Seeds

Despite not being recognized by the Parks and associated Friends of the Southwest Nature Preserve in Arlington, Texas (And I have brought this to their attention), the Comanche harvester ant (Pogonomyrmex comanche) is an important part of the ecology of the Glen Rose Yucca Prairie.

This is a small prairie with about 60 Comanche harvester ant colonies.

This is a small prairie with about 60 Comanche harvester ant colonies

There are about 60 colonies in this 4.43 ha meadow.Comanche is generalist seed predator and when the Yucca are releasing their seeds, the ants are harvesting them. I have seen some colonies with all foragers bringing Yucca seeds. So, the ants have the potential to impact the Yucca population.

This Comanche harvester ant is harvesting a Yucca seed in the Southwest Nature Preserve.

This Comanche harvester ant is harvesting a Yucca seed in the Southwest Nature Preserve.

Comanche in SWNP

 

Here is a Comanche nest in the Yucca Meadow: typically a cone shape with a central entrance — the soil is sandy.

Comanche harvester ant nest in the Yucca Meadow

There are many grass and forb plants which have seeds Comanche will forage. Here a forager is bringing back a snake cotton seed. Because of the many hairs on this seed, Comanche appears to use it like Velcro and sometimes collects other seeds with these hairs, thus bringing back more than one seed.

Comanche harvester ant collected  a snake cotton seed

Note the spread of her jaws or mandibles and how she has curled her body around toward the seed.

There are several Comanche nests in the trails at the Southwest Preserve as well. Some of these are quite a distance from the Yucca Meadow.

Comanche harvester ants congregating at their nest

Comanche harvester ants congregating at their nest

The above nest is near the meadow.

Comanche harvester ant nest in a trail

The above nest is in a trail far away from the Yucca meadow. None of the trail nests have as distinctive a crater form.

Finally, there is at least one Barbatus harvester ant colony in a trail at the Southwest Nature Preserve, not far from the Yucca Meadow. This colony has moved it locations a few times over the past 5 years.

Barbatus harvester ant colony