Shifting balances in the weighting of sensory modalities are predicted by divergence in brain morphology in incipient species of Heliconius butterflies
Shifting balances in the weighting of sensory modalities are predicted by divergence in brain morphology in incipient species of Heliconius butterflies
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DOI：
10.1016/j.anbehav.2022.01.003
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发表时间：
2022-02-04
期刊：
影响因子：
2.5
通讯作者：
Montgomery, Stephen H.
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文献类型：
--
作者：
Dell'Aglio, Denise D.;McMillan, W. Owen;Montgomery, Stephen H.
整合和权衡各种感官知觉对于动物如何适应环境至关重要。大脑结构的差异通常发生在感觉处理区域，这表明投资反映了生态需求。在这里，我们使用两个parapatric密切相关的物种，Heliconius erato himera和Heliconius himera，测试的假设，即在感觉脑区的分歧影响觅食的决定。这些蝴蝶被隔离在一个生态梯度中，这与大脑形态的差异有关。e.哥伦比亚在视觉中心和H。himera投资嗅觉中心。在这里，我们证明了这两个物种在如何将视觉和嗅觉线索与积极的食物奖励联系起来方面有所不同。我们发现，当个体接受成对的嗅觉和视觉刺激训练，然后在冲突中呈现这些刺激时，他们表现出不同的行为反应。Heliconius himera比H. e.而对视觉线索的偏好则与配对刺激无关。这表明，这些物种在觅食过程中对这些不同的感觉域的重视程度有所不同，这与观察到的大脑形态学差异一致。这一结果加强了证据表明，物种形成发起的地方适应部分是由关键行为功能的神经基础的变化。?? 2022动物行为研究协会。由爱思唯尔有限公司出版。保留所有权利。
Integrating and weighting sensory perception across modalities is crucial to how animals adapt to their environment. Divergence in brain structure is often in sensory processing regions, suggesting that investment reflects ecological needs. Here, we use two parapatric closely related species, Heliconius erato cyrbia and Heliconius himera, to test the hypothesis that divergence in sensory brain regions affects foraging decisions. These butterflies are isolated across an ecological gradient, which is linked to differences in brain morphology, with H. e. cyrbia investing more in visual centres and H. himera investing in olfactory centres. Here, we demonstrate that these two species vary in how they associate visual and olfactory cues with positive food rewards. We found that when individuals were trained on paired olfactory and visual stimuli, then presented with these stimuli in conflict, they showed distinct behavioural responses. Heliconius himera was more likely to favour positive olfactory cues than H. e. cyrbia, which favoured visual cues regardless of the paired stimulus. This suggests that these species have diverged in the emphasis placed on these different sensory domains during foraging, consistent with observed differences in brain morphology. This result strengthens evidence that speciation initiated by local adaptation is partly facilitated by changes in the neural basis of key behavioural functions. ?? 2022 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.