Kangaroo Island honey study: one pre-fire honey type vanished from harvests after 2021

A honey type once harvested on Australia's Kangaroo Island has not appeared in samples since 2021, according to a University of Western Australia study of 120 honeys collected from 2014 to 2026. The researchers say it was likely sourced from heavily burned land in the island's west, where the 2019-2020 Black Summer fires hit hard.

The study was pitched as proof of purity for one of Australia's most distinctive honeys. Its more unusual result is that the same data works as a record of what a landscape did after a fire.

A sanctuary with a chemical record

Kangaroo Island has protected its Ligurian honeybees by law since 1885, making it the world's oldest bee sanctuary, the university says. The population is genetically isolated and free of the varroa mite.

Local beekeepers supplied samples spanning the fires, which burned around 211,000 hectares, close to half the island. The team read each honey with high-performance thin-layer chromatography, a method that separates the plant compounds carried from flower to hive into what the researchers call a nectar signature.

They identified 13 distinct honey types, four of which had enough samples for a reliable fingerprint. The main types met every measure tested against the international honey standard, including moisture, sugar profile, acidity and freshness.

What changed after the fires

The harvest record itself has a hole in it. Records show a gap in extraction during a severe drought after the fires, when beekeepers left honey in the hives to keep colonies healthy.

Some long-standing types continued from unburned coastal and eastern areas. Others are new, including one linked to Kangaroo Island narrow-leaf mallee that first showed up in 2026 samples and had higher antibacterial activity, according to the university's summary of the work.

Recovery is slow on the bees' timescale. "It takes seven to 10 years for the vegetation to recover enough to provide the nectar our bees need to produce a good honey crop," said Sharon Simons, a representative of Kangaroo Island Beekeepers.

A honey jar as a vegetation monitor

The commercial use is straightforward. Lead author Liz Barbour, chief executive of Y-Trace, whose Perth lab ran the tests, and affiliated with the university, said the honey's high electrical conductivity reflects the island's eucalypts. Together with the fingerprint, she said, that gives a practical way to verify honey sold under the Kangaroo Island name.

The researchers also suggest that annual sampling could track how the island's vegetation is recovering, an approach they say could be used in other fire-affected places. That idea has not yet been tested as a monitoring program, and with only four types well characterized so far, the record is still thin for most of the 13.