The function of wall-following behaviors in the Mexican blind cavefish and a sighted relative, the Mexican tetra (Astyanax)
The function of wall-following behaviors in the Mexican blind cavefish and a sighted relative, the Mexican tetra (Astyanax)
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DOI：
10.1007/s00359-008-0400-9
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发表时间：
2009-03-01
影响因子：
2.1
通讯作者：
de Perera, Theresa Burt
中科院分区：
文献类型：
--
作者：
Sharma, Saurabh;Coombs, Sheryl;de Perera, Theresa Burt
墨西哥盲洞穴鱼表现出一种无条件的墙壁以下的行为，以应对新的环境。类似的行为已经在各种动物中观察到，但这种行为的生物学意义和进化历史在很大程度上是未知的。在这项研究中，墨西哥盲洞穴鱼（Astyanax sp.）在黑暗（红外线）或光线充足的条件下，将鱼引入新的环境后，对有视力的墨西哥脂鲤（Astyanax mexicanus）进行了录像。在黑暗的条件下，视力正常和失明的变种表现出墙以下的行为与微妙的，但显着的差异。盲人变体游泳更接近平行的墙壁，表现出更大的墙壁以下的连续性，并达到更高水平的持续游泳速度更快比视力变体。相比之下，在光线中看到的变形在很长一段时间内保持不动，或者在坦克的中心周围缓慢移动，而不会被带到墙壁上。这些结果与以下观点一致：沿墙行走是一种共同的原始特征，在黑暗条件下具有探索功能，以弥补视觉的缺失。这种行为已经成为更多的磨练在盲目变形的探索性的牺牲-在很大程度上是由于增强，积极的流量传感能力的侧线。
Mexican blind cavefish exhibit an unconditioned wall-following behavior in response to novel environments. Similar behaviors have been observed in a wide variety of animals, but the biological significance and evolutionary history of this behavior are largely unknown. In this study, the behaviors of Mexican blind cavefish (Astyanax sp.) and sighted Mexican tetra (Astyanax mexicanus) were videotaped after fish were introduced into a novel environment under dark (infrared) or well-lit conditions. Under dark conditions, both sighted and blind morphs exhibited wall-following behaviors with subtle but significant differences. Blind morphs swam more nearly parallel to the wall, exhibited greater wall-following continuity and reached higher levels of sustained swimming speeds more quickly than sighted morphs. In contrast, sighted morphs in the light remained motionless near the wall for long periods of time or moved slowly around the center of the tank without entraining to the walls. These results are consistent with the idea that wall-following is a shared, primitive trait that serves an exploratory function under dark conditions to compensate for the absence of vision. This behavior has become more honed in blind morphs for exploratory purposes-in large part due to the enhanced, active-flow sensing abilities of the lateral line.