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智科眼: 双语看懂新科研
首页 中国TOP论文 Nature Science JACS AngewChem PRL AdvMater Lancet Cell EnglMed JAMA
Vision is highly sensitive to oxygen availability in marine invertebrate larvae
视觉是高度敏感的 to 氧气可用性 in 海洋无脊椎动物幼虫
Lillian R. McCormick; Lisa A. Levin; Nicholas W. Oesch
  • J Exp Biol vol: issue: (2019) [全文下载] 扫码分享
  • 影响因子: 3.2 点击(47) 收藏(0) 评分(0)
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  • 生物学
  • 尽管对维持眼睛及其处理结构有很高的能量需求,但对于许多动物来说,进化已经选择了复杂的视觉系统。因此,视觉系统的代谢需求使它们对可用氧气的波动高度敏感。在海洋环境中,氧气在日常,季节和年际时间尺度上发生变化,并且氧气随深度变化很大。视觉与许多海洋动物的生存有关,特别是在甲壳类动物,头足类动物和鱼类中,并且这些群体的早期生命阶段依赖于猎物捕获,捕食者检测及其在水柱中的分布的视觉。使用体内视网膜电图记录,我们显示当暴露于氧气可用性降低时,海洋无脊椎动物对视网膜的光敏感性降低。我们发现头足类动物和甲壳类动物幼虫的视网膜反应减少60-100%:市场鱿鱼(Doryteuthis opalescens),双斑章鱼(Octopus bimaculatus),金枪鱼(Pleuroncodes planipes)和brachyuran crab(Metacarcinus gracilis) 。氧气的下降也会降低D. opalescens的视觉时间分辨率。这些结果首次证明了海洋无脊椎动物的视觉对氧气的可用性非常敏感,并且减少氧气的视力损害阈值是物种特异性的。氧损伤的视网膜功能可能会改变这些海洋幼虫存活至关重要的视觉行为。这些发现可能会影响我们对物种对海洋氧气损失的脆弱性的理解,并建议进行电生理学实验的研究人员应监测氧气水平,因为即使氧气的微小变化也可能影响结果。
  • For many animals, evolution has selected for complex visual systems despite the high energetic demands associated with maintaining eyes and their processing structures. The metabolic demands of visual systems therefore make them highly sensitive to fluctuations in available oxygen. In the marine environment, oxygen changes over daily, seasonal, and inter-annual time scales and there are large gradients of oxygen with depth. Vision is linked to survival in many marine animals, particularly among the crustaceans, cephalopods, and fish, and early life stages of these groups rely on vision for prey capture, predator detection, and their distribution in the water column. Using in vivo electroretinogram recordings, we show that there is a decrease in retinal sensitivity to light in marine invertebrates when exposed to reduced oxygen availability. We found a 60-100% reduction in retinal responses in the larvae of cephalopods and crustaceans: the market squid (Doryteuthis opalescens), two-spot octopus (Octopus bimaculatus), tuna crab (Pleuroncodes planipes), and brachyuran crab (Metacarcinus gracilis). A decline in oxygen also decreases the temporal resolution of vision in D. opalescens. These results are the first demonstration that vision in marine invertebrates is highly sensitive to oxygen availability and that the thresholds for visual impairment from reduced oxygen are species-specific. Oxygen-impaired retinal function may change the visual behaviors crucial to survival in these marine larvae. These findings may impact our understanding of species’ vulnerability to ocean oxygen loss and suggest that researchers conducting electrophysiology experiments should monitor oxygen levels, as even small changes in oxygen may affect the results.
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