A parasite-mediated life-history shift in Daphnia magna

被引：80

作者：

Chadwick, W ^{[1
]}

Little, TJ ^{[1
]}

机构：

[1] Univ Edinburgh, Sch Biol Sci, Ashworth Labs, Edinburgh EH9 3JT, Midlothian, Scotland

来源：

PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES | 2005年 / 272卷 / 1562期

关键词：

parasite-mediated selection; Glugoides intestinalis; Daphnia; microsporidian; phenotypic plasticity; life history;

D O I：

10.1098/rspb.2004.2959

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The impact of parasitism on host populations will be modulated by both genetic variation for susceptibility, and phenotypically plastic life-history traits that are altered to lessen the fitness consequences of infection. In this study we tested for life-history shifts in the crustacean Daphnia magna following exposure to the horizontally transmitted microsporidian, Glugoides intestinalis. In two separate experiments, we exposed hosts to parasite spores and measured their fecundity relative to controls. We show that hosts exposed to G. intestinalis show fecundity compensation, i.e. hosts shift their life-history strategy towards early reproduction. Our experiments included multiple host genotypes, and subtle differences among them indicated that fecundity compensation could be subject to parasite-mediated natural selection.

引用

页码：505 / 509

页数：5

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