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Evolution of reduced pre-adult viability and larval growth rate in laboratory populations of Drosophila melanogaster selected for shorter development time

Published online by Cambridge University Press:  18 January 2001

N. G. PRASAD
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India
MALLIKARJUN SHAKARAD
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India
VISHAL M. GOHIL
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India Present address: Department of Biological Sciences, Wayne State University, Detroit MI 48202, USA.
V. SHEEBA
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India
M. RAJAMANI
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India
AMITABH JOSHI
Affiliation:
Evolutionary Biology Laboratory, Evolutionary & Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, PO Box No. 6436, Jakkur, Bangalore 560 064, India
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Abstract

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Four large (n > 1000) populations of Drosophila melanogaster, derived from control populations maintained on a 3 week discrete generation cycle, were subjected to selection for fast development and early reproduction. Egg to eclosion survivorship and development time and dry weight at eclosion were monitored every 10 generations. Over 70 generations of selection, development time in the selected populations decreased by approximately 36 h relative to controls, a 20% decline. The difference in male and female development time was also reduced in the selected populations. Flies from the selected populations were increasingly lighter at eclosion than controls, with the reduction in dry weight at eclosion over 70 generations of selection being approximately 45% in males and 39% in females. Larval growth rate (dry weight at eclosion/development time) was also reduced in the selected lines over 70 generations, relative to controls, by approximately 32% in males and 24% in females. However, part of this relative reduction was due to an increase in growth rate of the controls populations, presumably an expression of adaptation to conditions in our laboratory. After 50 generations of selection had elapsed, a considerable and increasing pre- adult viability cost to faster development became apparent, with viability in the selected populations being about 22% less than that of controls at generation 70 of selection.

Type
Research Article
Copyright
© 2000 Cambridge University Press