Variation in somatic condition and testis mass in Feirana quadranus along an altitudinal gradient

摘要: The competition for fertilization among sperm from different males can drive variation in male reproductive investments. However, the mechanisms shaping allocation and resulting variations investment relative to environmental variables such as resource availability male-male remain poorly known frogs. Here, we investigated inter-population somatic condition testis mass across four populations of swelled vent frog Feirana quadranus along an altitudinal gradient. We found that did not increase with altitude, which was inconsistent previous predictions latitude and/or altitude should result decreased production anurans due shortened breeding seasons decline availability. also no male/female operational sex ratio altitude. exhibited a positive correlation mass, indicated condition-dependent size F. . Moreover, increasing suggest increased intensity competition, thereby mass.