A smaller spring bee with her small cell reared sisters.

Large cell comb generates large bees. Right? And small cell comb generates small bees. Right? That's what I thought when regressing my bees. When the first spring brood hatched from the small cell comb, those bees were smaller than the over wintered bees raised on the larger cell sized comb. These small cell bees were visibly smaller and had a more tapered abdomen.

By midsummer, those over wintered, large cell bees had perished. Hives consisted of bees raised only on the small cell comb. These bees should be easy to spot in the field. Yet, when searching for them, I couldn't find a single small cell appearing bee. Barry Birkey had both large and small cell colonies. His small cell colonies contained fully regressed lusbees. But, he couldn't see any size difference between his foraging bees either.

That winter, I monitored a small cell hive in my backyard using a plexiglass inner cover. The small cell bees gradually got larger through the winter. When the first brood hatched in the spring, the difference in their size was apparent. The typical small cell sized bee was easy to recognize when compared to their over wintered small cell sisters. Did I have genetically large cell bees squeezed into a small cell comb? Such was the suggestion.

Next March, I obtained several lusbee nucs from southern Arizona. They contained fully regressed bees. These bees looked like the typical spring bees I had seen in my hives. They were noticeably smaller than my own over wintered small cell bees. It was summer in Arizona and late winter in Wyoming.

One month later, I couldn't see any size difference between my over wintered small cell bees and the Lusbees. I joked that the Lusbees had filled up their canteens. :>) It appeared the Lusbees got larger or that my own bees got smaller. Maybe, both!

This small spring bee is several days old. She's much smaller
than her small cell over wintered sisters.

Oh..No...

After the first season's regression, I had extra large cell frames filled with granulated honey. Four years of severe drought had decimated the spring bee forage. And summer bee forage was looking rather bleak. The bees were decreasing brood rearing. So, I fed my small cell bees. A super of large cell feed was placed beneath an excluder, at the hive's bottom. The bees began moving the honey upward. The queens started laying more brood.

Then, those queens promptly squeezed through the excluder. They filled the bottom super with perfect wall to wall worker brood, not the drone brood that was speculated. Again, I moved the queens above the excluder. Yet, most returned to the bottom box. It appeared the queens actually preferred to lay in the larger cell sized comb, even when open small cell comb existed above the excluder. I removed the excluders.

Yikes! My small cell hives had a full box of large cell brood! Had I wrecked my small cell hives? Would I've to treat them and contaminate the newly drawn comb?

Not all was lost. I had the opportunity to compare large and small cell bees from the same hive, at the same time.

When the larger cell brood emerged, I returned expecting to see some fat, long, large cell sized bees. I couldn't find a single one! All the bees looked the same. What was going on?

Expansion

Next season, I decided to expand my hive count. Lacking enough small cell comb, I used both large cell and small cell comb in each hive. I put six small cell comb in the center of each super and two large cell comb toward each outside edge. These hives prospered. No discernable size differences existed between the bees in each hive. Natural mite drop remained very low, about 1 mite/week.

Contraction

Lives change. Expansion was out. Contraction was in. I reduced my hive count and restructured my hives. I kept those hives with all small cell comb. I planned to fill my empty large cell equipment with bees and sell it.

Large or Small Cell Comb?

A top bar hive was established from one small cell hive. By season's end, it was no longer large or small cell comb. Nor, was it large and small cell comb. But a full range of cell sizes grading from large to small. It was natural sized comb.

The natural broodnest structure indicated the bees use the smaller cell sizes from fall through the early spring. When the broodnest expands during the summer, larger cell sizes are used to rear brood. And they comprise over half of it.

Large or Small Cell Bees?

If it isn't large or small cell comb, is it large or small cell bees? Test time. Three all large cell hives were started in clean equipment. Once established, I attempted to visually compare bee size difference between the all large cell hives and the all small cell hives.

Different bee races displayed some size differences. But little size difference was seen between large cell hives and small cell hives. I could not tell, by looking at the bees, whether a hive was large or small cell. Maybe the old wrangler needs new glasses, huh :>)

The Test

So, new glasses it was! Digital ones. I monitored and measured seasonal bee size. Bee photos were taken at each hive entrance. A scale was included in each shot. At least three shots were taken per month. Nine suitable bees were picked, per hive, per month, for measurements.

Some basic measurements were obtained. Bee length, wing length, thorax width, and abdominal width were chosen. The first three measurements are obvious. Abdominal width was measured at the front end of the third abdominal segment, in front of the tomenta.

These measurements were averaged for each hive. Then, they were compiled and averaged for all large cell hives. And again for all small cell hives.

Results

The first five months of data are in. Here's a summary of what I've measured so far:

Here are some measurements for a 'typical' large and a 'typical' small cell hive.

In September, large cell bees average larger than the small cell bees. By November, both the small and large cell bees are essentially the same size even though they were raised on different size cell sized comb!

It's also interesting to note the abdomen width increased, slightly, from October to November for both large and small cell bees. Maybe both the bees and beekeepers picked up a little width during the winter. :>)

I had trouble getting enough bees for a good sample in December. I measured a few bees and have included the data, but don't think it's a random or a representative sample.

January's sample was better than Decembers. Obtaining shots, of enough flying bees, during the winter, is difficult.

Enough is Enough

It's February and new bees are hatching out in my large cell hives. They look like the early spring bees did in my small cell hives. I've measured enough. About 300 measurements were taken in a good round of samples. That's about 1500 measurements over all. I don't need to numerically quantify these observations for myself. I hope they give you something to think about.

I see some differences in bee size, in a hive, through time. Probably because I've taken so many measurements. The differences are subtle, but visible. But I still can't tell the difference between the small cell and large cell bees without my records. There's as much variation, throughout the year, within a hive, as there's between different cell size hives. It's obvious when different size bees occupy the same hive! Drifting isn't a factor as one large cell hive is over 2 miles from the nearest known hive.

By May, many of the larger over wintered bees are gone. All bees are more uniformly sized and smaller.

By July, Most bees are slightly larger than they were in May. All of the typical spring small cell sized bees are gone. And it appears the large cell bees are slightly larger overall than the small cell bees. The differences are discernible by measuring but not by looking at bees at the hive entrance. Bee sizes between the large cell hive and the small cell hives are beginning to diverge and result in somewhat different sized bees as measured in September.

I'll leave a parting thought. Below are some scaled photos of bees from a large cell and a small cell hive in March, July and November. The photos are at the same scale. Which are the small cell bees? Are you sure? The size is in the name. Right click a photo. Click Properties. It's name contains the info.

March large and small cell bees. Which one is which?

July large and small cell bees. Who is who?

November large and small cell bees. Getting any better?

I wasn't very tricky, was I? But if you are a small cell beekeeper, the results should surprise you. :>)

It's also interesting to compare spring versus fall bees. See any size differences?