Hi! In this video we're going to weigh how much does an ant weigh?
And tring to appraise how many workers is in this formicarium?
We will count with their weight.
The weight of ants could be different by species.
For example you can see the Camponotus nicobarensis between,
their workers around 6 - 8 mm long,
but on the top there are the Harpegnathos venator,
these workers much bigger, can reach easily the 14 mm length.
And there is the Pheidole noda,
these workers are much smaller, minors only 2 - 3 mm long,
and majors only reach the 4 - 5 mm, so their weight are much less.
Will use a petri dish,
daub it's edge with an escape-prevent oil.
Ants can't go through this, so i can put them to the scales.
First use this small scales, it shows minimum 0,03 gramm, but it not too exact, so I will count with the average of 10 measures.
After i get the average weight of the petri dish,
i start to put workers in it with a brush carefully,
and trying to count how much would be an average ant's weigh?
When i put only one worker to the scales nothing happen,
but maybe can weigh the weight of 10 workers,
and will count it for only 1 ant.
If it still not work we will count with 20, 30, 40, etc.. workers, for sure.
This average method works well,
because my scale not too exact for this tiny weigh,
and second because the weight of the workers could different.
This Camponotus nicobarensis species have minor and major workers - their weight are different,
and the worker's weight also could depend of the nutrient reserves in their stomach.
Finally i count the workers from 10 to 100, and count with the average value of 10 weighs.
Can see the results on this graph.
If you see the first column, it much higher than the others.
I weigh only 10 workers here, and it shows that 12,5 mg is the average weight of a worker.
This data too high, probably doesn't work the average method with only 10 workers, so let's delete this column.
The graph looks much better now!
Can see there are a bit different columns on left, but for the end the values goes nicely to one direction.
Let's see the next graph!
Here can see averages. The averages of the previous columns.
In the first column from 20 to 100, so this is the average of the 20, 30, 40, etc values.
Here also can see that the values goes straight to one direction.
This is show as much workers we weigh, and as many average we count - as exact number we get.
So we will use the last value.
It shows 4,38 mg is a weight of an average worker.
As i know this value could be real.
But how many workers we have then in this formicarium?
For assign it we have to weigh the difference between an empty and a full formicarium.
It's important to get out every objects from the formicarium which's weight can sabotage the weigh.
So i daub some escape-prevent oil to the top of the formicarium.
It makes easier to get out the test tubes without many ant escapers.
Also try to get out the bigger insect-remainders, as i can.
I have to watering the moister-sponge of the empty formicarium,
as the another one's sponge also moist.
This is a same formicarium, but empty.
We will subtract it's weight from the weight of the formicarium with ants inside,
so we get the weight of the workers, the queen, and the brood.
It's 12 g.
Disperse it with the average weight of a worker - from previous values,
and it is....
2740
We can estimate the worker number for 2740 in this formicarium,
but don't forget, there are also the queen, the brood, and some insect-remainders in it,
so it's a higher estimated value.
But will more workers hatch from the brood soon,
and between as much ants, doesn't matter plus-minus some hundred workers.
Hope you liked this Math lesson!
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We will produce many better and better ant videos in the future.
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