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View Thread :: Identification queries :: Diptera (adults)
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flies on oak tree sap
#1 Print Post
Posted on 30-07-2005 20:55

Location: Rotterdam, Netherlands
Posts: 120
Joined: 21.03.05

On an oak tree I saw a lot of wasps in a frenzy over the trees' sap.
On closer observation I also saw these flies.
In extreem dark circumstances so I had to spike the pictures considerably.
Any ideas?
Edited by elck on 30-07-2005 23:39
Paul Beuk
#2 Print Post
Posted on 30-07-2005 23:14
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Location: Netherlands
Posts: 19208
Joined: 11.05.04

They are Drosophilidae, belonging to the Drosophila genera complex. I will try to find out which one it is.

- - - -

Paul Beuk on
#3 Print Post
Posted on 30-07-2005 23:40

Location: Rotterdam, Netherlands
Posts: 120
Joined: 21.03.05

thanks, is it known behaviour?
Paul Beuk
#4 Print Post
Posted on 31-07-2005 09:32
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Numerous species may come to fermenting substances of any kind. Several seem to prefer fermenting tree sap, among others the species of the (former sub-)genus Scaptodrosophila, including the species S. deflexa and S. rufifrons. Moreover, some other (morphologically different) genera can be found near sapruns as well, for example Amiota, Leucophenga and Stegana.

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Paul Beuk on
#5 Print Post
Posted on 31-07-2005 11:28

Location: Rotterdam, Netherlands
Posts: 120
Joined: 21.03.05

Apart from the wasps vespula vulgaris I also observed Atalanta butterflies vanessa atalanta .
It's always a good place to see insects from near by.
Thanks for the reply.

Edited by elck on 31-07-2005 11:29
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