Seen from a distance, the mound of an Allegheny Mound Ant,
Formica exsectoides, should display a fairly uniform curve. When it has a shape such as this, you know
there’s been a problem.
Some animal took out a 20 inch wide section clear across the
mound. There must be something awfully
tasty in there for something to invest this much effort in excavation
work. This has got to be the work of a
larger mammal, but it’s hard to imagine the reward being sufficient for this
type of exercise. In the warmth of the
afternoon sun, the ants were enthusiastically attacking me as I knelt beside
the mound. I wasn’t concerned because
the ants were only biting my clothing.
The intruder probably took the brunt of any colony defense with his hair
and didn’t care anymore than I did that he was covered with ants.
It’s hard to tell how long ago the attack occurred. Undisturbed soil on the surrounding leaves
show that it hasn’t rained since the time of excavation, but it hasn’t rained a
drop in two weeks, so that doesn’t narrow it down much. Plants uprooted from the top of the mound
were well desiccated, indicating that their roots have been exposed for several
days.
There was quite a path of destruction left by the
attack. It looked like at least 8 inches
had been removed from the top of the mound.
The mound material is full of tiny limestone crumbs that come
from the pulverized bedrock beneath the soil.
Soil depth on this site is just over half a foot, so I’m assuming the
presence of the limestone means that the colony has built its tunnels and
chambers down into the bedrock.
The ants are busy making repairs, but the mound really needs
some water to help things along. The
soil is just dust and rocks that won’t stick or stack. It’s like trying to make sand castles with
dry sand.
It may be well into summer before the mound is back in
shape. Some ants will continue with the repairs while others forage for food
and perform other colony duties. Maybe I
should pitch them a treat from time to time, so some of the food gatherers can
stay at home and help with the building.
Do you have bears?
ReplyDeleteHi James. Bears sometimes wander through this part of Ohio, but we don't have any residents near here. It would certainly be exciting to find a bear digging up an ant mound, but I doubt that will happen any time soon.
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