Experience, but not age, is associated with volumetric mushroom body expansion in solitary alkali bees
Experience, but not age, is associated with volumetric mushroom body expansion in solitary alkali bees
复制标题
DOI：
10.1242/jeb.238899
复制
发表时间：
2021-03-01
影响因子：
2.8
通讯作者：
Kapheim, Karen M.
中科院分区：
文献类型：
--
作者：
Hagadorn, Mallory A.;Johnson, Makenna M.;Kapheim, Karen M.
在社会性昆虫中，行为的变化往往伴随着大脑结构的变化。这种神经可塑性可能与经验（经验依赖）或年龄（经验预期）有关。然而，神经可塑性和社会性之间的进化关系尚不清楚，因为我们对社会物种的孤独亲属的神经可塑性知之甚少。我们用共聚焦显微镜来测量大脑的变化，年龄和经验的孤独halictid蜜蜂（Nomia melanderi）。首先，我们比较了新出现的女性，被剥夺了生殖和觅食经验的实验室女性，以及自由飞行，筑巢女性之间的单个大脑区域的体积。经验，而不是年龄，导致蘑菇体的显着扩张-与学习和记忆相关的高阶处理中心。接下来，我们研究了社会经验如何影响神经可塑性，通过比较单独或与另一名女性配对的女性的大脑。配对的女性有显着较大的嗅觉区的蘑菇机构。总之，这些实验结果表明，经验依赖的神经可塑性是共同的孤独和社会类群，而经验预期的神经可塑性可能是一种适应生活在社会群体。此外，神经可塑性对社会化学信号的反应可能促进了社会性的进化。
In social insects, changes in behavior are often accompanied by structural changes in the brain. This neuroplasticity may come with experience (experience-dependent) or age (experience-expectant). Yet, the evolutionary relationship between neuroplasticity and sociality is unclear, because we know little about neuroplasticity in the solitary relatives of social species. We used confocal microscopy to measure brain changes in response to age and experience in a solitary halictid bee (Nomia melanderi). First, we compared the volume of individual brain regions among newly emerged females, laboratory females deprived of reproductive and foraging experience, and free-flying, nesting females. Experience, but not age, led to significant expansion of the mushroom bodies - higher-order processing centers associated with learning and memory. Next, we investigated how social experience influences neuroplasticity by comparing the brains of females kept in the laboratory either alone or paired with another female. Paired females had significantly larger olfactory regions of the mushroom bodies. Together, these experimental results indicate that experience-dependent neuroplasticity is common to both solitary and social taxa, whereas experience-expectant neuroplasticity may be an adaptation to life in a social colony. Further, neuroplasticity in response to social chemical signalsmay have facilitated the evolution of sociality.