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首页> 外文期刊>Equine Veterinary Education >Spectral Sensitivity Change May Precede Habitat Shift in the Developing Retina of the Atlantic Tarpon (Megalops atlanticus)
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Spectral Sensitivity Change May Precede Habitat Shift in the Developing Retina of the Atlantic Tarpon (Megalops atlanticus)

机译：光谱敏感性变化可能在大西洋蒲公（Megalops Attanticus）中的栖息地转变

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Fish that undergo ontogenetic migrations between habitats often encounter new light environments that require changes in the spectral sensitivity of the retina. For many fish, sensitivity of the retina changes to match the environmental spectrum, but the timing of retinal change relative to habitat shift remains unknown. Does retinal change in fish precede habitat shift, or is it a response to encountered changes in environmental light? Spectral sensitivity changes were examined over the development of the Atlantic tarpon (Megalops atlanticus) retina relative to ontogenetic shifts in habitat light. Opsin gene isoform expression and inferred chromophore use of visual pigments were examined over the course of M. atlanticus development. Spectral sensitivity of the retina was then determined by electroretinography and compared to the spectroradiometric measurements of habitat light encountered by M. atlanticus from juveniles to adults. These data, along with previously known microspectrophotometric measurements of sensitivity in M. atlanticus, indicate retinal spectral sensitivity that matches the dominant wavelengths of environmental light for juvenile and adult fish. For the intervening subadult stage, however, spectral sensitivity does not match the dominant wavelength of light it occupies but better matches the dominant wavelengths of light in the habitat of its forthcoming migration. These results first indicate that the relationship between environmental light spectrum and spectral sensitivity of the retina changes during M. atlanticus development and then suggest that such changes may be programmed to support visual anticipation of new photic environments.
机译：在栖息地之间经过围粒机迁移的鱼经常遇到需要改变视网膜的光谱敏感性的新光环境。对于许多鱼来说，视网膜的敏感性变化以匹配环境谱，但相对于栖息地转变的视网膜变化的时序仍然未知。鱼类的视网膜改变是否在栖息地转变，或者是遇到环境光变化的反应吗？在Atlantic Tarpon（Megalops Atlanticus）视网膜相对于栖息地光的植入变化的发展，检查了光谱敏感性变化。在M.Atlanticus开发过程中检查了OPSIN基因同种型表达和推断发色团使用可视颜料。然后通过电动图术测定视网膜的光谱敏感性，并与M.Atlanticus从少年到成人的栖息地遇到的栖息地光的光谱辐射测量相比。这些数据以及先前已知的M.Atlanticus中的敏感性的微痉挛测量值，表明视网膜光谱敏感性与少年和成人鱼的环境光的主导波长相匹配。然而，对于介入的子地位阶段，光谱敏感性与其占用的光的主导波长不匹配，但更好地匹配其即将迁移的栖息地中的栖息地的光线波长。这些结果首先表明，在M.Atlanticus开发期间，视网膜的环境光谱与视网膜的光谱敏感性之间的关系，然后建议这些变化可以编程，以支持新的光环境的视觉预期。

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