Clutch size manipulations in the chestnut weevil, Curculio elephas:: fitness of oviposition strategies

被引:51
作者
Desouhant, E [1 ]
Debouzie, D [1 ]
Ploye, H [1 ]
Menu, F [1 ]
机构
[1] Univ Lyon 1, CNRS, UMR Biometrie & Biol Evolut 5558, F-69622 Villeurbanne, France
关键词
natural population; insect; clutch size; fitness; egg-time limitation;
D O I
10.1007/s004420050971
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We test the adaptive value of clutch size observed in a natural population of the chestnut weevil Curculio elephas. Clutch size is defined as the number of immatures per infested chestnut. In natural conditions, clutch size averages 1.7 eggs. By manipulating clutch size in the field, we demonstrate that deviations from the theoretical "Lack clutch size", estimated as eight immatures, are mainly due to proximate and delayed effects of clutch size on offspring performance. We show the existence of a trade-off between clutch size and larval weight. The latter a key life-history trait, is highly correlated with fitness because it is a strong determinant of larval survival and potential fecundity of offspring females. The fitness of different potential oviposition strategies characterized by their clutch sizes, ranging from one to nine immatures, was calculated from field-estimated parameters. Chestnut weevil females obtain an evolutionary advantage by laying their eggs singly, since, for instance, fitness of single-egg clutches exceeds fitness of two-egg clutches and four-egg clutches by 8.0% and 15.1% respectively.
引用
收藏
页码:493 / 499
页数:7
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