Farias T O, Notini A A, Talamoni S A, Godinho H P
Programa de Pós-graduação em Zoologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Avenida Dom José Gaspar, 500, 30535-610, Belo Horizonte, MG, Brazil.
Anat Histol Embryol. 2015 Oct;44(5):361-9. doi: 10.1111/ahe.12148. Epub 2014 Sep 24.
Yellowish myotis, Myotis levis, is a seasonal, epididymal sperm-storing Neotropical vespertilionid. In the dry season, males show simultaneous testis regression and sperm storage in cauda epididymis, enabling them to mate during this season. In this study, we investigated seasonal variations in body mass, diameter and height of seminiferous tubules and nuclei of Leydig cells in a population of southeastern Brazil. We also determined the frequencies of the stages of the seminiferous epithelium cycle (SEC) of mature individuals of this population. Body mass and diameter of Leydig cell nuclei showed no significant differences between dry and rainy seasons and stages of annual reproductive cycle; however, all other morphometric parameters varied significantly. The relative cumulative frequency of pre-meiotic stages of the SEC (1-3) was 51%, of meiotic stage (4) was 2% and of post-meiotic stages (5-8) was 47%. We confirmed that the yellowish myotis presents seasonal sperm production as revealed by testis regression and epididymal sperm storage during the dry season.
黄蝠（Myotis levis）是一种新热带区的食虫蝙蝠，具有季节性的附睾精子储存能力。在旱季，雄性黄蝠的睾丸会退化，同时精子会储存在附睾尾部，使它们能够在这个季节进行交配。在本研究中，我们调查了巴西东南部一个黄蝠种群的体重、生精小管直径和高度以及莱迪希细胞（Leydig cell）核的季节性变化。我们还确定了该种群成熟个体生精上皮周期（seminiferous epithelium cycle，SEC）各阶段的频率。莱迪希细胞核的体重和直径在旱季和雨季以及年度生殖周期各阶段之间没有显著差异；然而，所有其他形态学参数都有显著变化。SEC减数分裂前期阶段（1-3）的相对累积频率为51%，减数分裂阶段（4）为2%，减数分裂后期阶段（5-8）为47%。我们证实，黄蝠呈现出季节性精子生成，这在旱季睾丸退化和附睾精子储存中得到了体现。
