Natural history and trophic ecology of three populations of the Mexican cavefish, Astyanax mexicanus

Natural history and trophic ecology of three populations of the Mexican cavefish, Astyanax mexicanus
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墨西哥洞穴鱼 Astyanax mexicanus 三个种群的自然历史和营养生态学

DOI:
10.1007/s10641-021-01163-y
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发表时间:
2021
影响因子:
1.4
通讯作者:
García-De León, F. J.
García-De León, F. J.
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Wilson, E. J.;Tobler, M.;Riesch, R.;Martínez-García, L.;García-De León, F. J.

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墨西哥洞穴鱼,Astyanax mexicanus(学名:Astyanax mexicanus),已成为进化生理学和发育生物学的重要模型,为感官系统,色素沉着和新陈代谢的进化提供了见解。相比之下,对这种难以捉摸的洞穴居民的自然历史和营养生态学知之甚少。我们调查了三个独立的殖民洞穴系统(Pachón,Tinaja和Sabinos),这是位于墨西哥东北部的Sierra de El Abra的洞穴鱼。全年多次采集样本,以调查体型、性别比例、空肠个体比例和饮食组成的变化。我们发现一致的差异,在洞穴之间的身体大小,性别比例一般女性偏见,虽然在不同程度上。肠道内容物分析表明,洞穴鱼全年消耗的食物,和饮食占主导地位的碎屑,植物材料,和水生无脊椎动物。特别是在帕琼洞穴,我们在那里进行了denominary采样,有证据表明饮食组成的季节性变化与雨季和旱季一致。我们的研究结果可能表明,该系统中的洞穴环境的特点是持续的营养限制,而不是间歇性的饥饿。
The Mexican cavefish,Astyanax mexicanus(Characidae), has become an important model in evolutionary physiology and developmental biology, providing insights into the evolution of sensory systems, pigmentation, and metabolism. In contrast, comparatively little is known about the natural history and trophic ecology of this elusive cave inhabitant. We investigated cavefish from three independently colonized cave systems (Pachón, Tinaja, and Sabinos), which are located in the Sierra de El Abra of northeastern Mexico. Samples were collected multiple times throughout the year to investigate variation in body size, sex ratios, proportions of individuals with empty guts, and diet composition. We found consistent differences in body size among caves, and sex ratios were generally female biased, although to varying degrees. Gut content analyses indicated that cavefish consume food throughout the year, and diets are dominated by detritus, plant materials, and aquatic invertebrates. Especially in the Pachón cave, where we had the densest sampling, there was evidence for seasonal changes in diet composition that coincided with the rainy and dry seasons. Our findings potentially suggest that the cave environments in this system are characterized by continual nutrient limitation, rather than intermittent periods of starvation.
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发表时间: 2021
影响因子: 2.1
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