Nutrient regulation in relation to diet breadth:: a comparison of Heliothis sister species and a hybrid
Nutrient regulation in relation to diet breadth:: a comparison of Heliothis sister species and a hybrid
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DOI：
10.1242/jeb.02253
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发表时间：
2006-06-01
影响因子：
2.8
通讯作者：
Simpson, SJ
中科院分区：
文献类型：
--
作者：
Lee, KP;Behmer, ST;Simpson, SJ
我们通过比较两种姐妹毛毛虫及其杂交种的饮食选择、营养平衡、摄入后利用和发育的模式，研究了昆虫食草动物饮食宽度的营养相关性。其中一种烟芽夜蛾 (HV) 具有广泛的寄主范围，以至少 14 个科的植物为食。另一种是Heliothis subflexa (HS)，是酸浆属（茄科）植物的专家。使用合成食物的实验表明，当毛毛虫被允许混合饮食时，通才会自行选择较高蛋白质的饮食，而专才则吃几乎等量的蛋白质和碳水化合物，这与两个物种天然饮食中营养成分的差异相符。当仅限于营养不均衡的饮食时，通才表现出比专才更大程度地过度食用高蛋白质：碳水化合物（P：C）饮食的倾向，并保持较高的发育速度。然而，通才并没有像专科医生那样过度食用低 P:C 饮食。该杂交品种选择的饮食结构与其多面手父亲（HV）没有什么区别，而它对不平衡饮食的反应则与多面手母亲（HS）非常相似。通才将摄入的养分转化为生长的效率低于专才和混合型。我们的研究结果表明，与营养调节相关的不同行为和生理特征受到遗传控制，并且可以根据两种昆虫环境中不同的生活史、摄食生态和假定的营养异质性水平来解释。
We examined the nutritional correlates of diet breadth in insect herbivores by comparing patterns of diet selection, nutrient balancing, post-ingestive utilization and development in two sister species of caterpillar and a hybrid between them. One species, Heliothis virescens (HV) has a broad host range, feeding on plants in at least 14 families. The other, Heliothis subflexa (HS), is a specialist on plants in the genus Physalis (Solanaceae). Experiments using synthetic foods showed that when the caterpillars were allowed to mix their diet, the generalist self-selected a higher-protein diet whereas the specialist ate almost equal amounts of protein and carbohydrate, which accords with differences between the two species in the nutrient content of their natural diets. When confined to nutritionally imbalanced diets, the generalist showed a propensity to over-eat high protein: carbohydrate (P:C) diets to a greater degree than did the specialist and maintained higher rates of development. The generalist did not, however, over-eat low P:C diets to the same degree as the specialist. The hybrid selected a diet composition that was indistinguishable to that of its generalist father (HV), while its response to imbalanced diets was closely similar to that of the specialist mother (HS). The generalist converted ingested nutrient to growth with lower efficiency than did the specialist and the hybrid. Our findings imply that different behavioural and physiological traits linked to nutrient regulation are under genetic control and are explicable in terms of the different life-histories, feeding ecologies and presumed levels of nutritional heterogeneity in the environments of the two insects.