Aussie Native Bees Steal the Show With Unique Social and Foraging Behaviors

The head of a native bee.

Australian native bees have evolved complex social structures and foraging behaviors that help biologists answer longstanding questions, such as the origins of social behavior, and the drivers of increased biodiversity. (Image: James Dorey via Flinders University)

Australian native bees have evolved complex social structures and foraging behaviors that help biologists answer longstanding questions, such as the origins of social behavior, and the drivers of increased biodiversity. In European honeybees, the queen governs the hive with her sterile female workers. Meanwhile, the males are little more than freeloaders, or hangers-on (sorry boys).

But most Australian bees are different. Some are solitary. Others live in cooperative, egalitarian societies where individuals share and jointly defend the nest. There is no clear division into queen and worker castes. Our new research, in the journals Biology Letters and Apidologie, reveals fresh insights into the evolution and ecology of Australian bees. These creatures deserve more attention and respect, not only for the ecosystem services they provide, but also for the scientific lessons they can teach us.

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Unusual bee-havior

All bees face pressure from parasites and predators. But we discovered a unique strategy in one Australian species known as the capricious masked bee (Amphylaeus morosus).

Of the more than 2,000 species in the highly diverse Colletidae bee family, only the capricious masked bee is known to be social. Females that choose to cooperate can dramatically improve their defense against enemies such as parasitoid wasps and flies. In these cooperative groups, one female protects the developing brood while the mother is away on foraging trips. (European honeybee queens rely on workers for such tasks, while they stay home.)

The guards do not produce their own offspring. However, guarded colonies do tend to produce more offspring — and the extras are always males. However, having too many nest guards in the population can lead to an excess of males.

When males greatly outnumber females, far fewer males (compared to females) will reproduce and pass on their genes. This reduces the genetic “value” of males and in turn cooperative behavior. Eventually, the relative benefit of cooperative nesting is diminished. We suggest this limits the frequency of the nest guard strategy, putting the brakes on further social evolution.

Cutaway of a broken fern frond showing the nest of the Australian native bee Amphylaeus morosus.
Amphylaeus morosus makes its nests in the broken fern fronds of the rough tree fern Cyathea australis that are densely spread throughout the Dandenong Ranges and Central Highlands regions of Victoria, and more sporadically throughout montane habitats along the east coast of Australia. (Image: James Dorey via Flinders University)

The birds and the bees

When we took a closer look at the diet of other Australian colletid bees (also known as plasterer bees due to the way they smooth the walls of their nest cells with secretions that dry to a cellophane-like lining), we found it varied considerably.

A yellow native Australian bee Euryglossinae sp. collecting pollen from a white flower.
Plasterer bees, the most biodiverse group of bees in Australia, only exploit a limited range of native plants — mostly in the Myrtaceae family. (Image: via James Dorey)

One group in particular only visited a very restricted range of plants. This group, the euryglossines, accounts for almost a quarter of all Australian bee species. So why are they so fussy? The answer may lie in the nature of the food itself. Euryglossines clearly prefer plants in the family Myrtaceae. These include the gums, melaleucas, and tea trees that dominate Australian landscapes and provide massive amounts of pollen and nectar. Their shallow, brush-like flowers are also easy for small bees to access.

Parrots and gum trees are both iconic parts of the Australian landscape, and likely influenced the evolution of each other. (Image: via Michael Lee)

These same distinctive flowers are heavily used by parrots, such as ringnecks, lorikeets, and rosellas – who also love pollen and nectar. This floral system has likely been shaped by the co-evolution of parrots and gum trees, and we suspect it was later exploited by euryglossine bees, which helps account for their high species diversity. Clearly, they are both onto a good thing.

This research supports what many have suspected for years. Natives typically need other natives to flourish. Our native bees rely on our native plants, even if some have more flexible diets than others. Spend some time looking at a flowering gum and you’re almost certain to see some of our tiniest but hardest-working pollinators — along with some of the brightest and loudest.

How to observe Australian bees

It is all very well for expert bee nerds, like us, to tell you about the value of native species. But to really appreciate our native bees, you should try observing them for yourself: they are all around us, but often smaller and less ostentatious than European honeybees. Native bees are easy to spot, even in urban environments. Parklands, roadside verges, and even our gardens are full of them. Look for them at work pollinating flowers — they might look like little dark flies initially, but closer inspection will reveal their true bee shape.

They can be nesting in bare patches on the ground, the soft stems of tree ferns or grass trees, in the “bee hotels” made by people, or even pruned rose and hydrangea bushes. Just check for little perfectly round holes with insects buzzing around. With a bit of patience, a cold drink, and a comfy stool or cushion, you can watch these entrances and see critters hard at work.

Social Australian stem nesting bees are surprisingly complex, even though their colonies rarely contain more than four or five females. Watch for guard bees plugging the nest entrance with their red or black abdomens, while other females go to collect food. With extra patience, it is possible to see ants or tiny wasps gather around the nest entrances, waiting for an unguarded moment to attack.

A brightly colored neon cuckoo native bee, Thyreus nitidulus, roosting on a stick for the night.
A female neon cuckoo native bee, Thyreus nitidulus, roosting on a stick for the night. These cuckoo bees will follow blue-banded bees to their nests and replace their egg with one of their own. Hence the name ‘cuckoo’. (Image: via James Dorey)

Australia has more than 1,650 native bee species. We encourage you to enjoy them on flowers, in the ground, in stems, or wherever you can find them. These little animals have a lot to offer us in terms of how we understand the world, in addition to being vital parts of the ecosystem. And importantly, they are our responsibility to understand and protect.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

James B. Dorey, Adjunct Associate Professor, Flinders University; Lucas Hearn, Researcher, Flinders University; Mike Lee, Professor in Evolutionary Biology (jointly appointed with South Australian Museum), Flinders University, and Patricia S. Slattery, Postgraduate Student, Flinders University

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