Dietary effects on life history traits in a terrestrial isopod: the importance of evaluating maternal effects and trade-offs
Dietary effects on life history traits in a terrestrial isopod: the importance of evaluating maternal effects and trade-offs
复制标题
DOI：
10.1007/s00442-003-1447-5
复制
发表时间：
2004-02-01
期刊：
影响因子：
2.7
通讯作者：
Bozinovic, F
中科院分区：
文献类型：
--
作者：
Lardies, MA;Carter, MJ;Bozinovic, F
生命史研究的目的是解释生殖投资、生长和生存的进化模式。特征之间的权衡是生活史理论的基本组成部分。在草食节肢动物中，生活史特征通常对许多环境因素的变化做出反应，尤其是饮食质量。我们在受控实验室条件下使用三种人工饲料，研究了普通土鳖（陆生等足类动物）Porcellio laevis 的生活史性状（即生长速率、后代数量、后代大小、孵化期）的变化、性状之间的权衡以及母体对后代生长速率的影响。高蛋白饮食对后代的生产有重大影响，导致后代体型较小，并证明了最后两个性状之间的权衡。高碳水化合物饮食很少对潜伏期产生显着影响。饮食质量显然对母亲的生活史以及后代的生长有重要影响。然而，这些影响的方向是相反的。喂养高蛋白质浓度饮食的母亲表现出显着的母体效应，以个体发育后期的后代生长率来衡量。我们的研究结果支持这样的观点，即饮食中的蛋白质而不是碳水化合物的浓度限制了草食节肢动物，并对生活史性状具有显着影响，正如在非洲对虾中所看到的那样。显然，潜伏期和后代数量之间的表型相关性从负到正的变化是生活史性状权衡的背景依赖性的经验证明。
Studies of life history aim to explain patterns in the evolution of reproductive investment, growth, and survival. Trade-offs between traits are a fundamental component of life history theory. In herbivorous arthropods life history traits are often responsive to variation in numerous environmental factors, especially diet quality. Using three artificial diets under controlled laboratory conditions, we examined changes in life history traits (i.e. growth rate, offspring number, offspring size, incubation period), trade-offs between traits, and maternal effect on the growth rate of offspring, in the common woodlouse (terrestrial isopod), Porcellio laevis. The high protein diet had significant impacts on offspring production, triggering a smaller-sized offspring, and demonstrating a trade-off between these last two traits. The high carbohydrate diet seldom exerted a significant effect on incubation period. The quality of dietary items evidently has important consequences on the life history of the mother and, thus, on offspring growth; the directions of these effects, however, were opposite. Mothers fed diets with high protein concentrations presented significant maternal effects, measured as offspring growth rate during later ontogeny. Our results support the notion that protein, rather than carbohydrate, concentrations in the diet limit herbivorous arthropods, and have significant consequences on life history traits, as was seen for P. laevis. Clearly, the change in phenotypic correlations between incubation period and offspring number from negative to positive is an empirical demonstration of the context dependence of life history trait trade-offs.