老化对大鲵采食行为的影响

E. Lewis, J. Campbell, R. Gaugler
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引用次数: 19

摘要

荚膜斯坦纳虫感染幼体的行为随年龄变化。在从宿主尸体中出现后不久,具有传染性的carpocapae幼虫大部分时间都在玩耍。这种行为提高了它们寻找(伏击)宿主的成功率。在羽化后的2 - 4周,它们的活动能力增加,孵化率下降。这些行为上的变化表明,觅食策略可能发生了转变,从伏击到更灵活的模式。我们通过测量可能赋予移动觅食者成功的行为变化来验证这一假设,包括对宿主提示的反应以及对久坐与移动宿主的依恋。我们发现,伏击的成功率随着年龄的增长而下降,但在沙柱实验中,S. carpocapsae感染幼鱼作为移动搜索者的成功率没有相应的增加。我们认为昆虫病原线虫不会因为搜索失败或老化而改变它们的觅食策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effects of Aging On the Foraging Behaviour of Steinernema Carpocapsae (Rhabdita: Steinernematidae)
Steinernema carpocapsae infective juvenile behaviour changes with age. Soon after emergence from the host cadaver, S. carpocapsae infective juveniles spend most of their time nictating. This behaviour enhances their host finding (ambushing) success. Between two and four weeks after emergence, their mobility increases and their nictation rate decreases. These alterations in behaviour suggested that a shift in foraging strategy from ambushing to a more mobile mode may occur. We tested this hypothesis by measuring changes in behaviours that may confer success to mobile foragers, including response to host cues and attachment to sedentary vs mobile hosts. We found that the success rate of ambushing declined with age, but there was no corresponding increase in the success rate of S. carpocapsae infective juveniles as mobile searchers, as measured in a sand column assay. We suggest that entomopathogenic nematodes do not alter their foraging strategy in response to unsuccessful search or aging.
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