Manipulation of natal host modifies adult reproductive behaviour in the butterfly Heliconius charithonia

D. Kemp
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引用次数: 5

Abstract

Advances in understanding non-genetic inheritance have prompted broader interest in environmental effects. One way in which such effects may influence adaptation is via the transmission of acquired habitat biases. Here I explore how natal experience influences adult host orientation in the oligophagous passion vine butterfly Heliconius charithonia. As an exemplar of the ‘pupal mating' system, this species poses novelty among diurnal Lepidoptera for the extent to which male as well as female reproductive behaviours are guided by olfactory host cues. I sampled wild adult females breeding exclusively upon Passiflora incarnata, assigned their offspring to develop either upon this species or its local alternative Passiflora suberosa, and then assessed the behaviour of F1 adults in a large rainforest enclosure. Despite the fact that juvenile performance was superior upon P. incarnata, females oviposited preferentially upon their assigned natal species. Mate-seeking males also indicated a bias for the proximity of their natal host, and there was evidence for assortative mating based upon host treatment, although these data are less robust. This study is, to my knowledge, the first to support Hopkins' hostplant principle in butterflies, and points to inducible host preferences capable of reinforcing ecological segregation and ultimately accelerating evolutionary divergence in sympatry.
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对出生寄主的操纵改变了蝴蝶Heliconius charithonia成虫的生殖行为
在了解非基因遗传方面的进展促使人们对环境影响产生了更广泛的兴趣。这种影响可能影响适应的一种方式是通过后天生境偏见的传播。在这里,我探讨了出生经历如何影响寡食西番莲蝴蝶的成虫寄主取向。作为“蛹交配”系统的典范,该物种在昼夜活动的鳞翅目中具有新颖性,因为雄性和雌性的生殖行为都是由嗅觉宿主提示引导的。我选取了仅以西番莲为食的野生成年雌性,将它们的后代分配给该物种或其当地替代品西番莲,然后评估了大型雨林圈地中F1成年的行为。尽管幼鱼的产卵表现优于红腹虫,但雌鱼更倾向于产卵于它们指定的出生物种。寻求配偶的雄性也表现出对其出生宿主的接近性的偏见,并且有证据表明基于宿主治疗的选型交配,尽管这些数据不太可靠。据我所知,这项研究是第一个在蝴蝶中支持霍普金斯寄主植物原理的研究,并指出诱导寄主偏好能够加强生态隔离,并最终加速同属生物的进化分化。
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