Differences in chemosensory response between eyed and eyeless Astyanax mexicanus of the Rio Subterráneo cave.
Differences in chemosensory response between eyed and eyeless Astyanax mexicanus of the Rio Subterráneo cave.
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DOI：
10.1186/2041-9139-4-25
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发表时间：
2013-09-04
期刊：
影响因子：
4.1
通讯作者：
Rétaux S
中科院分区：
文献类型：
--
作者：
Bibliowicz J;Alié A;Espinasa L;Yoshizawa M;Blin M;Hinaux H;Legendre L;Père S;Rétaux S
在盲洞居住种群的Astyanax mexicanus，在进化过程中发生了一些形态和行为的转变，在洞穴的特点是完全和永久的黑暗。先前的研究表明，感觉系统，如侧线（机械感觉）和味蕾（化学感觉）在洞穴鱼中被修改。长期以来，人们一直假设，另一种化学感觉方式，嗅觉系统，可能已经演变，以及提供一个额外的机制，在troglomorphic Astyanax种群的食物搜索。在2013年3月对墨西哥圣路易斯波托西的Sierra de El Abra地区的洞穴探险中，我们测试了Rio Subterráneo洞穴的Astyanax mexicanus的化学感应能力。这个洞穴拥有一个杂交种群，呈现出广泛的troglomorphic和epigean混合表型。在洞穴中进行的行为测试中，观察到眼睛的缺失与对食物提取物的吸引力增加之间存在惊人的相关性。此外，无眼troglomorphic鱼具有显着较大的鼻孔大小比他们的眼睛，nontroglomorphic同行。我们的研究结果表明，化学感受能力可能已经在洞穴居住Astyanax mexicanus和鼻孔大小的调制可能至少部分地基于这种可能的适应性变化。
In blind cave-dwelling populations of Astyanax mexicanus, several morphological and behavioral shifts occurred during evolution in caves characterized by total and permanent darkness. Previous studies have shown that sensory systems such as the lateral line (mechanosensory) and taste buds (chemosensory) are modified in cavefish. It has long been hypothesized that another chemosensory modality, the olfactory system, might have evolved as well to provide an additional mechanism for food-searching in troglomorphic Astyanax populations. During a March 2013 cave expedition to the Sierra de El Abra region of San Luís Potosi, Mexico, we tested chemosensory capabilities of the Astyanax mexicanus of the Rio Subterráneo cave. This cave hosts a hybrid population presenting a wide range of troglomorphic and epigean mixed phenotypes. During a behavioral test performed in situ in the cave, a striking correlation was observed between the absence of eyes and an increased attraction to food extract. In addition, eyeless troglomorphic fish possessed significantly larger naris size than their eyed, nontroglomorphic counterparts. Our findings suggest that chemosensory capabilities might have evolved in cave-dwelling Astyanax mexicanus and that modulation of naris size might at least partially underlie this likely adaptive change.
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影响因子：
9.2
作者：
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通讯作者：
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影响因子：
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DOI：
10.1007/s00359-008-0400-9
发表时间：
2009-03-01
影响因子：
2.1
作者：
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通讯作者：
de Perera, Theresa Burt