From owner-drosophila@net.bio.net Thu Feb 15 22:00:00 1996
Path: biosci!pobox.ruu.nl!g.e.w.thorig
From: g.e.w.thorig@pobox.ruu.nl ("g.e.w. thorig")
Newsgroups: bionet.drosophila
Subject: re:pupae
Date: 16 Feb 1996 03:24:46 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
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February 1996=0A=
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Dear Dr. Martin Feder=0A=
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Natural pupation sites are investigated by someone, somewhere in the =
Netherlands, sorry for you, but I forgot the details. Try Leiden =
University, Biology Department.=0A=
Under laboratory conditions pupation sites are affected, as you probably =
know, by factors such as light intensity, yeast concentration and acetic =
acid (DIS 75:92, 1994).=0A=
Photonegative behavior is usually correlated with danger of overheating =
and desiccation. However, photonegative behavior (of flies) probably is =
also correlated with photodegradation of the essential vitamin =
riboflavin. This is very significant under laboratory conditions. It =
makes the food medium highly unsuitable to support survival of larvae. =
Antioxidants, such as vitamin C prevent photodegradation, whereas acetic =
acid enhances photodegradation.=0A=
Suitablity depends on the relative concentrations of vitamin C and =
acetic acid (I hope to publish these results soon). This is found under =
laboratory conditions.=0A=
I wonder whether suitability of the food under natural conditions is =
also affected by light intensity and consequently of pupation site =
behavior. I do not know whether this is the case. I hope you can use =
this information, best wishes,=0A=
=0A=
=0A=
Berd G. Bruins,=0A=
Dep. Plant Ecology and Evolutionary Biology=0A=
Utrecht University=0A=
Padualaan 8=0A=
3584 CH Utrecht=0A=
The Netherlands=0A=


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