Effect of water turbidity on the visual acuity of harbor seals (Phoca vitulina)
Effect of water turbidity on the visual acuity of harbor seals (Phoca vitulina)
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DOI：
10.1016/j.visres.2005.08.015
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发表时间：
2006-05-01
期刊：
影响因子：
1.8
通讯作者：
Dehnhardt, Guido
中科院分区：
文献类型：
--
作者：
Weiffen, Michael;Moeller, Bettina;Dehnhardt, Guido
测定了两只雄性斑海豹在不同浑浊度水中的水下视力(高对比度方波光栅在2m视距下的最小可分辨线宽所掩盖的角度)。我们从清水中5.5‘和12.7’的视力角开始，发现随着浑浊度的增加，视力在7.4‘和6.0’/Formazin neplieleter单位(FNU)的速率下迅速下降。除了被测试的海豹的视觉表现的个体差异外，我们的结果还显示，即使在中度浑浊的情况下，视觉敏锐度也会急剧下降。在德国瓦登海的一些地点，众所周知，海豹在那里漫步和觅食，我们测量到的浑浊度超过了40FNU。这些数据表明，浑浊度必须被认为是鳍脚类感觉生态中的一个重要因素。(C)2005爱思唯尔有限公司。保留所有权利。
The underwater visual acuity (the angle subtended by the minimal resolvable line width of high contrast square wave gratings at a viewing distance of 2 m) of two male harbor seals was determined at different levels of water turbidity. Starting with visual acuity angles of 5.5 ' and 12.7 ' in clear water we found visual acuity to decrease rapidly with increasing turbidity at rates of 7.4 ' and 6.0 ' per formazin neplielometric unit (FNU). Besides the individual differences in visual performance of the harbor seals tested, our results reveal a dramatic loss of visual acuity even at moderate levels of turbidity. At sites in the German Wadden Sea, where harbor seals are known to roam and forage, we measured turbidity levels exceeding 40 FNU. These data suggest that turbidity has to be considered as an important factor in the sensory ecology of pinnipeds. (c) 2005 Elsevier Ltd. All rights reserved.