摘要：Reproductive characteristics and age structure were studied in a population of Ctenomys mendocinus, located in the Andean Piedmont of Mendoza (1330 m elevation). Sexual activity occurred from mid-Jelly through March, with the first births occurring,in mid-October. Litters born at the end of the reproductive season resulted from a second pregnancy caused by postpartum estrus or mid-lactation estrus. Individuals reached sexual maturity in the first reproductive season after their birth. Mature males were active all year long. Their testicular size increased in winter, when sexual activity of females began. Sexual ratio of immature and mature individuals was not significantly different from 1:1 throughout the year. The population consisted of a high proportion of mature individuals (73.7%, n =141). This Piedmont population showed a longer reproductive period, and a higher percentage of pregnancy by postpartum estrus than a population from the Precordillera (3000 m elevation) previously studied. These characteristics would determine a higher reproductive potential, according to the better climatic conditions and higher food availability in the Piedmont
