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Adaptive significance of changes in morph production during the transition from parthenogenetic to sexual reproduction in the aphid Rhopalosiphum padi (Homoptera: Aphididae)

Published online by Cambridge University Press:  10 July 2009

A.B.M. Austin ,
G.M. Tatchell ,
R. Harrington  and
J.S. Bale
A.B.M. Austin*
Affiliation:
Department of Pure and Applied Biology, University of Leeds, UK
G.M. Tatchell
Affiliation:
Department of Entomology and Nematology, Rothamsted Experimental Station, Harpenden, UK
R. Harrington
Affiliation:
Department of Entomology and Nematology, Rothamsted Experimental Station, Harpenden, UK
J.S. Bale
Affiliation:
Department of Pure and Applied Biology, University of Leeds, UK
*
Dr A.B.M. Austin, School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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Abstract

Many aphid species have life cycles which alternate between asexual reproduction during spring and summer and sexual reproduction in autumn. This paper describes the sequences of morphs produced by clones of Rhopalosiphum padi (Linnaeus) in response to a range of photoperiods and temperatures in the laboratory, and under semi-natural conditions at the time of year when the transition from parthenogenetic to sexual reproduction occurs. By using similarities in the order in which the various morphs were born, clones of R. padi were found to produce eight progeny sequence types. A clone of R. padi will produce these sequence types sequentially as it changes from parthenogenetic to fully sexual reproduction. The progeny sequence produced by clones under conditions corresponding to those of spring and summer consist of parthenogenetic females only. During late summer, production of parthenogenetic females is followed by males. Later in the year, a clone produces progeny sequences consisting of parthenogenetic females, gynoparae and males. The asexual phase of reproduction is terminated in late autumn when only gynoparae and males are born. A minority of clones terminate parthenogenetic reproduction by producing only gynoparae. The function of these changes in progeny sequence in maximizing the reproductive success of a clone of R. padi is discussed.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 86 , Issue 2 , April 1996 , pp. 93 - 99
Copyright
Copyright © Cambridge University Press 1996

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