Sunday, November 12, 2006

More native bees


These tiny reed bees (Exoneura sp), are commonly found in the garden quite early in the season and all through summer into autumn. They really are small, hence the dodgy photo, only about 5mm. Obviously of an easy going and opportunistic nature as they are delighted with anything flowering, native or exotic (polylectic).
They are a long tongued bee, in the family Apidae, and enjoy visiting the Hebe flowers especially, where they can get the (very small) lion's share as the thin tubular Hebe flowers are largely inaccessible to honeybees.

Knowing that they like to nest in pithy stems I've carefully pruned everything in the garden so that plenty of likely nest sites are in the offing. Every year they've spurned my efforts with the local species of Kangaroo Paw, Anigozanthus flavidus, and I've never managed to sight them nesting anywhere. Not even in grasstree flowering stems, which I'm assured are their standard site.

Until this year - and true to their form (in the eastern states they like to nest in Lantana), they've chosen an introduced species, the very beautiful and luckily non-weedy South African Dierama sp. Every stem diligently left after pruning away last years' very tall fairy fishing rod flowers has been neatly drilled out and swept clean of sawdust, and occupied by one or more resident bees.
Exoneura are one of the semi-social (or semi-solitary, depending on your preference) bees, and two or more may occupy a nest and share chores. The larvae are tended and fed with pollen.

These were actually struggling for possession of this stem, sharing wasn't remotely on their minds. Short of ear tagging the bees I couldn't say which was the rightful possessor of the nest.

The other thing that's different about Exoneura is that they survive the winter, unlike most other native bees. Both the male and female spend the winter in the nest. And the cooler days, by the look of things, as they are only out and about when the temperatures are relatively balmy. So I can afford to get attached to these appealing little characters. Hurrah!

A nice article here
Aussie bees abuzz



4 comments:

Snail said...

I must go and check the Hebe in the front garden.

Do you know how I could entice them to nest in my garden? Could I bundle up some straws or something?

amegilla said...

Could I bundle up some straws or something?

Sadly, this doesn't seem to do the trick with this lot. They are very fussy about their nests, appearing only to accept sticks or stems they've drilled out to exact dimensions themselves.
So the nesting offerings have to be the right size and consistency, and I'm assuming most importantly, durability, since they're going to overwinter in them.
The resin bees, Megachile sp. will happily accept offerings of bamboos and drilled wood etc, as they will use ready made holes and plaster them to the right size with their resin/cellulose mix.

Anonymous said...

And here I am, with Hebes in the garden ... which I have always disliked and yet, never looked at closely.

Why is it that some plants appeal to us and some don't?
I will look more closely as of now.

I was astonished to see them treasured in Auckland, New Zealand as one of their indigenous plants under assault from so very, very many weeds.

http://www.hebesoc.vispa.com/Where/Where.htm

jj

amegilla said...

G'day jj.
In this area, any plant that isn't monopolized by honeybees gives the locals a chance. As long as it isn't weedy, it's welcome.
:)

 
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