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The Structure And Sensitivity Of The Eye Of Different Life History Stages Of The Ontogenetic Migrator Gnathophausia Ingens

机译:个体遗传迁移器Gnathophausia Ingens不同生活史阶段的眼睛的结构和敏感性

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The structure and ultrastructure of the photore-ceptors of several life history stages of the ontogenetically migrating lophogastrid crustacean Gnathophausia ingens were examined. The younger instars of this species live in a much brighter light field than the older instars, and this difference is reflected in differences in their visual systems. The shallowest free living individuals (instars 3 and 4) possess a superposition eye with almost no clear zone, which minimizes the light shared between ommatidia and reduces the sensitivity of the eye. A progression to superposition optics with a large clear zone, usually associated with night-active or deep-living species, occurs as the animals move deeper in the water column. Regional differences within the eye are also evident, with a largely nonexistent clear zone in the dorsal region and a large clear zone in the ventral region in the eyes of instar 5 animals, the first instar to move to deeper depths. The deepest living instars (10-12) possess superposition optics with a large clear zone throughout the eye, and are significantly more sensitive to light than the younger, shallower instars.
机译:检查了个体发育的胃gas胃甲壳动物Gnathophausia ingens的几个生活史阶段的光感受器的结构和超微结构。与该年龄较大的幼虫相比,该物种的早期幼虫所处的光场要明亮得多,这种差异反映在它们的视觉系统上。最浅的自由活动个体(3和4龄幼虫)的眼睛重叠,几乎没有清晰的区域,这可以最大程度地减少眼睑之间共享的光线并降低眼睛的敏感度。当动物在水柱中移动得更深时,通常会与具有夜活动性或深生命的物种相关联,逐渐发展为具有大净区的叠加光学系统。 5龄动物的眼睛中,区域内的差异也很明显,在背侧区域中基本上不存在透明区域,而在腹侧区域中存在较大的透明区域,这是第一个移入更深深度的幼虫。生命最深的幼虫(10-12)具有重叠的光学元件,整个眼睛具有较大的透明区域,并且比年轻,较浅的幼虫对光的敏感度高得多。

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