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Fitness comparison between clones differing in their ability to produce sexuals in the aphid Rhopalosiphum padi
Author(s) -
Rispe Claude,
Simon JeanChristophe,
Pierre JeanSébastien
Publication year - 1996
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/j.1570-7458.1996.tb00961.x
Subject(s) - rhopalosiphum padi , biology , aphid , parthenogenesis , fecundity , aphididae , longevity , alate , polyphenism , homoptera , rhopalosiphum maidis , population dynamics , reproduction , botany , ecology , pest analysis , genetics , larva , demography , population , embryo , sociology
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 °C and 20 °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.