Behavioral performance and division of labor influence brain mosaicism in the leafcutter ant Atta cephalotes
Behavioral performance and division of labor influence brain mosaicism in the leafcutter ant Atta cephalotes
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DOI：
10.1007/s00359-021-01539-6
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发表时间：
2022-02-03
影响因子：
2.1
通讯作者：
Traniello，J. F. A.
中科院分区：
文献类型：
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作者：
Muratore，I. B.;Fandozzi，E. M.;Traniello，J. F. A.
大脑进化被假设为是由对神经结构的行为选择驱动的。我们开发了一种新的指标，相对神经解剖投资参与执行任务的感觉运动和处理需求的多态性任务专门化工人的切叶机antAtta cephalotes和量化的大脑大小和结构，以检查它们与我们的计算近似的相关性。据估计，媒体工作者在任务执行方面对多感觉和运动整合的投资最大，他们的技能高度多样化，包括叶子质量辨别和叶子收获任务，这些任务可能涉及要求严格的感觉和运动过程。共聚焦成像显示，绝对脑容量增加与工人的大小和功能专门的分区缩放工人之间的差异。蘑菇体，感觉统合和学习记忆的中心，触角叶，嗅觉输入网站，在媒体比在最小的（园丁）和显着大于专业（“士兵”），这两个都有较低的分数参与嗅觉处理在其特征任务的性能。与其他工人相比，Minims有一个比例更大的中央复合体。这些结果支持这一假设，即任务表现的变化影响马赛克脑结构的选择，由不同的神经柱组成的大脑的比例的独立进化。
Brain evolution is hypothesized to be driven by behavioral selection on neuroarchitecture. We developed a novel metric of relative neuroanatomical investments involved in performing tasks varying in sensorimotor and processing demands across polymorphic task-specialized workers of the leafcutter antAtta cephalotesand quantified brain size and structure to examine their correlation with our computational approximations. Investment in multisensory and motor integration for task performance was estimated to be greatest for media workers, whose highly diverse repertoire includes leaf-quality discrimination and leaf-harvesting tasks that likely involve demanding sensory and motor processes. Confocal imaging revealed that absolute brain volume increased with worker size and functionally specialized compartmental scaling differed among workers. The mushroom bodies, centers of sensory integration and learning and memory, and the antennal lobes, olfactory input sites, were larger in medias than in minims (gardeners) and significantly larger than in majors (“soldiers”), both of which had lower scores for involvement of olfactory processing in the performance of their characteristic tasks. Minims had a proportionally larger central complex compared to other workers. These results support the hypothesis that variation in task performance influences selection for mosaic brain structure, the independent evolution of proportions of the brain composed of different neuropils.