Morphology and reproduction of the cavefish Trichomycterus chaberti and the related epigean Trichomycterus cf. barbouri
Morphology and reproduction of the cavefish Trichomycterus chaberti and the related epigean Trichomycterus cf. barbouri
复制标题
洞穴鱼毛霉菌 (Trichomycterus chaberti) 和相关表观毛霉菌 (Trichomycterus) 的形态和繁殖 cf.
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
G. Miranda
中科院分区：
文献类型：
--
作者：
M. Pouilly;G. Miranda
玻利维亚安第斯山脉托罗托罗国家公园的地下和表层毛霉菌鲶鱼栖息在来自不同环境（洞穴、源头、峡谷和山谷）的溪流中。在地下种群中观察到眼睛直径和中脑表面积显着减小，同时端脑表面积增加。与预期相反，地下种群的触须似乎并没有更长。观察到的其他变量（色素沉着、眼睛不对称、小脑和菱脑的表面积、繁殖力和卵直径）的修改模式对应于从山谷到峡谷、源头和地下种群的值梯度。这一结果并不支持表层和地下种群之间的简单区分，而是支持对环境梯度的限制，其中洞穴对应于极端情况。
Hypogean and epigean populations of Trichomycterus catfishes inhabit streams from different environments (cave, headwater, canyon and valley) in the Torotoro National Park in the Andes, Bolivia. A significant reduction in the diameter of the eyes and in the surface area of the mesencephalon was observed in subterranean populations, along with an increase in the surface area of the telencephalon. Contrary to expectations, the barbel did not appear to be longer in hypogean populations. The observed pattern of modification of the other variables (pigmentation, eye asymmetry, surface area of the cerebellum and rhombencephalon, fecundity and egg diameter) corresponded to a gradient of values from valley to canyon, headwater and subterranean populations. This result argues not for a simple distinction between epigean and hypogean populations but for an adaptation to an environmental gradient of constraints in which caves correspond to an extreme situation.