From owner-drosophila@net.bio.net Tue Oct 24 22:00:00 1995 Newsgroups: bionet.drosophila Path: biosci!CS.Arizona.EDU!news.Arizona.EDU!hamblin.math.byu.edu!acs2.byu.edu!news.cuny.edu!caen!spool.mu.edu!howland.reston.ans.net!EU.net!uknet!newsfeed.ed.ac.uk!leeds.ac.uk!news From: PAB5RDJC@leeds.ac.uk (R.D.J. Catchpole) Subject: pupal development and sub-optimal diets Message-ID: <46igo7$7so_001@leeds.ac.uk> NNTP-Posting-Host: pab_pc74.leeds.ac.uk Organization: University of Leeds Date: Tue, 24 Oct 1995 12:55:33 +0100 (BST) X-Newsreader: News Xpress Version 1.0 Beta #4 Lines: 17 Dear All, Does anyone know of a reason why the length of pupal development should change in response to a sub-optimal larval diet? I've been looking at two species, D.virilis and D.melanogaster which respond in totally different ways. When the same number of larvae are placed on the same amount of food, larval development increases in D.melanogaster while pupal and total development time decreases. D.virilis does the reverse. The cause of changes in larval development are obvious but I cannot find any references to changes in pupal development, the accepted opinion appears to be that this doesn't happen. Any suggestions????? Thanks in advance. Roger .