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Titre :
|
Fitness comparison between clones differing in their ability to produce sexuals in the aphid Rhopalosiphum padi
|
|
Auteurs :
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C. Rispe ;
J. Simon ;
J. Pierre
|
|
Type de document :
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article/chapitre/communication
|
|
Année de publication :
|
1996
|
|
Format :
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469-474
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Langues:
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= Anglais
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Mots-clés:
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aphid
;
Rhopalosiphum padi
;
rate of increase
;
fitness
;
clone
;
parthenogenesis
;
sex
;
cost of polyphenism
|
|
Résumé :
|
This study aimed at evaluating the intrinsic rate of increase (r(m)) of clones of the cereal aphid Rhopalosiphum padi (L.) that differ in their ability to produce sexuals. The value of r(m) was measured for wingless parthenogenetic females in experiments conducted at two temperatures (15 degrees C and 20 degrees C). We studied six holocyclic clones, five androcyclic clones and five anholocyclic clones and showed that life-cycle has no significant effect on the age at first reproduction, on fecundity nor on longevity. As a result there is no influence on (summer) fitness: on the one hand, holocyclic clones do not compensate their lower fitness in mild winters by a higher fitness during the summer. On the other hand, anholocyclic and androcyclic clones do not seem to obtain any advantage from living on a more restricted range of hosts: there appears to be no cost of polyphenism for holocyclic clones.
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Source :
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Entomologia Experimentalis et Applicata - 0013-8703, vol. 80, n° 3
|
