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Sensory system plasticity in a visually specialized, nocturnal spider

机译:感觉系统可塑性在视觉上专业,夜间 蜘蛛

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摘要

The interplay between an animal’s environmental niche and its behavior can influence the evolutionary form and function of its sensory systems. While intraspecific variation in sensory systems has been documented across distant taxa, fewer studies have investigated how changes in behavior might relate to plasticity in sensory systems across developmental time. To investigate the relationships among behavior, peripheral sensory structures, and central processing regions in the brain, we take advantage of a dramatic within-species shift of behavior in a nocturnal, net-casting spider (Deinopis spinosa), where males cease visually-mediated foraging upon maturation. We compared eye diameters and brain region volumes across sex and life stage, the latter through micro-computed X-ray tomography. We show that mature males possess altered peripheral visual morphology when compared to their juvenile counterparts, as well as juvenile and mature females. Matching peripheral sensory structure modifications, we uncovered differences in relative investment in both lower-order and higher-order processing regions in the brain responsible for visual processing. Our study provides evidence for sensory system plasticity when individuals dramatically change behavior across life stages, uncovering new avenues of inquiry focusing on altered reliance of specific sensory information when entering a new behavioral niche.
机译:动物的环境利基与其行为之间的相互作用会影响其感觉系统的进化形式和功能。虽然已经在远处的分类群中记录了感官系统的种内变化,但很少有研究调查行为变化可能与整个发育时期的感官系统的可塑性相关的研究。为了研究行为,大脑周围感觉结构和中央处理区域之间的关系,我们利用了夜行性网播蜘蛛(Deinopis spinosa)中行为的剧烈物种内转移,男性停止了视觉介导的活动成熟时觅食。我们比较了性别和生命阶段(通过微计算机X射线断层扫描)的眼睛直径和大脑区域体积。我们显示,与少年同龄人以及少年和成年女性相比,成年男性拥有改变的周围视觉形态。匹配外围感觉结构的修改,我们发现负责视觉处理的大脑的低阶和高阶处理区域的相对投资存在差异。我们的研究为个体在生命周期中显着改变行为时的感觉系统可塑性提供了证据,从而揭示了新的研究途径,侧重于进入新的行为利基市场时对特定感觉信息的依赖度的改变。

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