Linking reproductive and feeding strategies in the parasitoid Ibalia leucospoides: does feeding always imply profit?
Linking reproductive and feeding strategies in the parasitoid Ibalia leucospoides: does feeding always imply profit?
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DOI：
10.1007/s10682-012-9608-9
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发表时间：
2013-05
影响因子：
1.9
通讯作者：
D. Fischbein;C. Bernstein;J. Corley
中科院分区：
文献类型：
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作者：
D. Fischbein;C. Bernstein;J. Corley
在生命过程中，资源的获取和分配对动物的生殖成功具有重要意义。动物在其一生中经历不同的环境条件，这可能在塑造其生活史和资源分配策略中起重要作用。本研究研究了拟寄生蜂白蠓（ibbalia leucospoides）的幼虫和成虫资源分配对其繁殖和生存功能的影响。幼虫资源分配模式是根据成虫体型与产卵指数（OI）之间的关系推断出来的，OI是一种早期繁殖投资的相对衡量标准，由初始卵量与潜在终身繁殖力之间的比率决定。通过室内实验，探讨成虫取食对繁殖、维持和代谢的影响，探讨成虫资源配置。还研究了这种寄生蜂在野外的食物获取。大小与OI之间的关系是恒定的，表明初始卵载量和潜在终身繁殖力的资源分配与大小没有差异。这一发现与原生卵子成熟策略的适应性模型预测一致（OI = 1）。尽管如此，我。leucospoides的OI值为0.77，属于弱同生物种（OI < 1）。成虫摄食对羽化后卵成熟无影响。然而，黄蜂通过进食来延长寿命，尽管只有在食物是免费提供的情况下。虽然我们获得的关于自由觅食黄蜂摄食行为的信息有限，但我们的结果表明，在野外，尽管可能，这种寄生蜂的摄食可能并不频繁。我们讨论了环境因素的相关结果，如繁殖机会和食物供应，这些因素可能驱动了寄生蜂幼虫和成虫资源分配模式的进化。
Resource acquisition and allocation to different biological functions over the course of life have strong implications for animal reproductive success. Animals can experience different environmental conditions during their lifetime, and this may play an important role in shaping their life-history and resource allocation strategies. In this study we investigate larval and adult resource allocation to reproductive and survival functions in the parasitoid waspIbalia leucospoides(family Ibaliidae). The pattern of larval resource allocation was inferred from the relationship between adult body size and ovigeny index (OI; a relative measure of investment in early reproduction determined as the ratio between the initial egg load and the potential lifetime fecundity); and adult resource allocation was explored through the influence of adult feeding on reproduction, maintenance and metabolism, in laboratory experiments. Food acquisition by this parasitoid in the wild was also examined. The relationship between size and OI was constant, suggesting no differential resource allocation to initial egg load and potential lifetime fecundity with size. This finding is in line with that predicted by adaptive models for the proovigenic egg maturation strategy (OI = 1). Despite of this,I. leucospoidesshowed a high OI of 0.77, which places this species among the weakly synovigenic ones (OI < 1). Adult feeding had no effect on post-emergence egg maturation. However, wasps extended their lifespan through feeding albeit only when food was provided ad libitum. Although the information we obtained on the feeding behaviour of free-foraging wasps is limited, our results suggest that food intake in the wild, while possible, may not be frequent in this parasitoid. We discuss the results relative to the environmental factors, such as reproductive opportunities and food availability, which may have driven the evolution of larval and adult pattern of resource allocation in parasitoids.