Visual sensitivity of deepwater fishes in Lake Superior.
Visual sensitivity of deepwater fishes in Lake Superior.
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DOI：
10.1371/journal.pone.0116173
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Mensinger AF
中科院分区：
文献类型：
--
作者：
Harrington KA;Hrabik TR;Mensinger AF
在苏必利尔湖的近海食物网中，捕食者-猎物的相互作用已经被很好地记录下来，但介导这些相互作用的感觉系统仍然未知。深水鳍鱼（Myoxocephalus thompsoni）、剑鞘鱼（Salvelinus namaycush siscowet）和kiyi （Coregonus kiyi）生活在低光照环境中。为了研究视觉在捕食者-猎物相互作用中的潜在作用，研究人员使用视网膜电图来确定每个物种的视觉灵敏度。光谱灵敏度曲线显示，各物种在525 nm处的峰值灵敏度与深度处普遍存在的下行光谱非常接近。为了确定是否有足够的光来调节捕食者-猎物的相互作用，我们将苏必利尔湖的视觉灵敏度与下行光的强度相关联，以构建每个物种的视觉深度剖面。在夏季的几个月里，sccowet和kiyi的白天辐照度约为325米，深水雕刻的白天辐照度约为355米。在满月条件下，存在足够的辐照度，以引起ERG对大约30米的光的响应，可用于siscowet和kiyi，以及45米的深水雕刻。因此，在这些生物在水柱中重叠的深度和时间，视觉交互是可能的，这表明视觉在深层淡水湖的深度可能比以前记录的要大得多。
The predator-prey interactions in the offshore food web of Lake Superior have been well documented, but the sensory systems mediating these interactions remain unknown. The deepwater sculpin, (Myoxocephalus thompsoni), siscowet (Salvelinus namaycush siscowet), and kiyi (Coregonus kiyi) inhabit low light level environments. To investigate the potential role of vision in predator-prey interactions, electroretinography was used to determine visual sensitivity for each species. Spectral sensitivity curves revealed peak sensitivity at 525 nm for each species which closely corresponds to the prevalent downwelling light spectrum at depth. To determine if sufficient light was available to mediate predator-prey interactions, visual sensitivity was correlated with the intensity of downwelling light in Lake Superior to construct visual depth profiles for each species. Sufficient daytime irradiance exists for visual interactions to approximately 325 m for siscowet and kiyi and 355 m for the deepwater sculpin during summer months. Under full moon conditions, sufficient irradiance exists to elicit ERG response to light available at approximately 30 m for the siscowet and kiyi and 45 m for the deepwater sculpin. Visual interactions are therefore possible at the depths and times when these organisms overlap in the water column indicating that vision may play a far greater role at depth in deep freshwater lakes than had been previously documented.