Why different bees make different honey

Four things the bee does to nectar

Nectar arriving at a nest is a dilute sugar solution — typically 20 to 40 per cent sugar, mostly sucrose, with traces of the flower's own aromatics. Honey is 80 per cent sugar, mostly inverted into fructose and glucose, and stable for years. Everything between those two states is done by the bee, and the details differ by species.

1. 1Enzymatic inversionInvertase from the hypopharyngeal glands splits sucrose into fructose and glucose. How completely this happens, and how much glucose oxidase comes with it, varies between species — and glucose oxidase is what generates the hydrogen peroxide behind honey's antibacterial activity.
2. 2DehydrationWater is driven off by fanning and by repeated regurgitation across the tongue. A honey bee colony takes nectar to 17-18 per cent water and caps it. A stingless bee colony stops around 25-30 per cent and frequently does not cap at all.
3. 3StorageHoney bees store in pure wax comb, which is chemically inert. Stingless bees store in cerumen — wax mixed with plant resin — and compounds leach from the resin into the honey.
4. 4Ripening in placeSealed honey continues to change slowly. Unsealed honey at high moisture is instead colonised by yeasts, which is why the two groups have opposite failure modes.

Why moisture is the master variable

Almost every practical difference between honey bee and stingless bee honey follows from water content. At 17 per cent, water activity sits around 0.5 to 0.6 — below what any microbe can use — and the honey is preserved by concentration alone. It also sits above its solubility limit for glucose, so it crystallises.

At 28 per cent, water activity is closer to 0.75. Concentration is no longer doing the preserving, so acidity and resin-derived compounds have to. And the sugars stay in solution, so the honey does not granulate — it ferments instead. Same word on the label, opposite behaviour in the cupboard.

Foraging radius makes a honey local or regional

A honey bee colony forages over several kilometres and can recruit precisely to a rich patch through the waggle dance, so its honey averages a landscape. A Melipona colony works a few hundred metres and recruits by scent trail, so its honey samples a circle you could walk across in two minutes.

That is why a monofloral stingless bee honey is nearly impossible and why two hives in the same village can produce noticeably different honey. It is also why stingless bees are poor at servicing large monocultures and good at diverse smallholdings — the same fact seen from the farmer's side.

What does not vary