The skylight gradient of luminance helps sandhoppers in sun and moon identification
The skylight gradient of luminance helps sandhoppers in sun and moon identification
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天光亮度梯度有助于沙漏识别太阳和月亮
DOI：
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发表时间：
2012
影响因子：
2.8
通讯作者：
L. Mercatelli
中科院分区：
文献类型：
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作者：
A. Ugolini;Giuditta Galanti;L. Mercatelli
为了回到海滩的生态最佳区域，跳沙海豚Talitrus saltator （Montagu）根据太阳和月亮罗盘保持恒定的海陆方向。本研究探讨了自然光照和人工光照条件下，天光亮度梯度在日月识别中的作用。在太阳下（主观的夜晚）和满月下（主观的白天）测试时，时钟移位（倒立）的跳沙虫表现出与夜晚太阳和月亮的正确识别一致的方向。在夜间没有人工亮度梯度的人工照明条件下进行测试，即使在白天照明条件允许太阳罗盘定向的情况下，人工天文线索也被识别为月球。当添加人工亮度梯度时，人工天文线索被识别为太阳。在现有和过去发现的基础上，讨论了天空亮度梯度在日月识别中的作用。
SUMMARY To return to the ecologically optimal zone of the beach, the sandhopper Talitrus saltator (Montagu) maintains a constant sea–land direction based on the sun and moon compasses. In this study, we investigated the role of the skylight gradient of luminance in sun and moon identification under natural and artificial conditions of illumination. Clock-shifted (inverted) sandhoppers tested under the sun (during their subjective night) and under the full moon (during their subjective day) exhibit orientation in accordance with correct identification of the sun and the moon at night. Tested in artificial conditions of illumination at night without the artificial gradient of luminance, the artificial astronomical cue is identified as the moon even when the conditions of illumination allow sun compass orientation during the day. When the artificial gradient of luminance is added, the artificial astronomical cue is identified as the sun. The role of the sky gradient of luminance in sun and moon identification is discussed on the basis of present and past findings.