Visual Acuity of the Harbour Seal and the Steller Sea Lion under Water
Visual Acuity of the Harbour Seal and the Steller Sea Lion under Water
复制标题
斑海豹和北海狮在水下的视力
作者：
R. Schusterman;R. Balliet
一些研究者认为海豹和海狮在水下捕食时主要依靠视觉。早期对鳍足类动物在水下的视觉敏锐度进行的实验，在使动物与刺激物保持最小距离以便计算出准确的视觉角度方面，以及在使用刺激物的配置时，在不受强度区分影响的情况下测量视觉分辨能力方面，基本上是失败的。本报告描述了纠正这些缺陷的实验。
SOME investigators have suggested that seals and sea lions rely primarily on sight when catching food under water1–4. Earlier experiments on the visual acuity of pinnipeds under water2 were largely unsuccessful in keeping animals at a minimum distance from the stimuli so that accurate visual angles could be calculated, and in using stimulus configurations in which visual resolving power could be measured uncontaminated by intensity discriminations5. This report describes experiments which have corrected these deficiences.