Host-feeding and acceptance by a parasitic wasp (Hymenoptera: Ichneumonidae) as influenced by egg load and experience in a patch
Host-feeding and acceptance by a parasitic wasp (Hymenoptera: Ichneumonidae) as influenced by egg load and experience in a patch
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寄生黄蜂（膜翅目：姬蜂科）的寄主喂养和接受受卵负载和斑块经验的影响
DOI：
10.1023/a:1006582013488
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发表时间：
2004
影响因子：
1.9
通讯作者：
T. Ueno
中科院分区：
文献类型：
--
作者：
T. Ueno
基于动态规划的最佳宿主选择模型预测，觅食昆虫的生理状态，即卵负载、能量储备等，会影响行为决策。为了检验这一预测，研究了生理状态对宿主接受外寄生黄蜂 Agrothereutes lanceolatus 的影响。将塑料杯中的雌性黄蜂（视为斑块）与宿主一起呈现，并持续观察它们对宿主的反应。观察后，对黄蜂进行解剖，并计算它们携带的成熟和未成熟卵的数量。结果表明，雌性黄蜂的行为决策受到成熟卵负载的影响，但不受黄蜂大小或未成熟卵负载的影响。因此，卵量较高的黄蜂更有可能产卵。先前在某个斑块中遇到的宿主数量（即黄蜂经历）也对雌性的宿主接受度有独立影响，表明雌性信息状态在该斑块中觅食期间进行了更新。雌性黄蜂仅在成熟卵负荷接近零时才进行寄主喂养。没有观察到同时的宿主进食。当寄生蜂卵转移到被喂养的宿主上时，寄生蜂的存活率几乎为零，这表明同时寄主喂养可能会导致后代死亡率很高。这三个结果支持了最佳宿主喂养模型的假设和预测。在最近的模型中讨论了寄生蜂宿主选择和宿主喂养。
Optimal host selection models based on dynamic programming predict that the physiological state of a foraging insect, i.e. egg load, energy reserves etc., influences behavioral decisions. To test this prediction, the effect of physiological state on host acceptance of the ectoparasitic wasp Agrothereutes lanceolatus was investigated. Female wasps in plastic cups (regarded as patches) were presented with hosts, and their responses to the hosts were continuously observed. After observations, the wasps were dissected and the number of mature and immature eggs they carried were counted. The results showed that behavioral decisions by the female wasps were influenced by mature egg load, but not by wasp size or immature egg load. Hence the wasps with higher egg loads were more likely to oviposit. The number of hosts previously encountered in a patch (i.e. wasp experience) also had an independent effect on females' host acceptance, indicating that female informational state was updated during foraging in that patch. Female wasps host-fed only when mature egg load approached zero. Concurrent host-feeding was not observed. Parasitoid survival was almost zero when parasitoid eggs were transferred onto hosts that were fed upon, indicating that concurrent host-feeding could cause a high degree of offspring mortality. These three results supported the assumption and prediction of optimal host-feeding models. Parasitoid host selection and host-feeding are discussed in the context of recent models.