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- ItemSeasonal variation in testicular and fat-body weight and plasma testosterone and androstenedione concentration in the lizard Cordylus polyzonus (Sauria: Cordylidae)(Open Journal Systems, 1993) Flemming, F.A.Seasonal variation in testiaJlar and fat-body weight and plasma testosterone and androstenedione concentration of the lizard Cordylus polyzonus is described. T estiaJlar recrudescence commenced in autumn (April). reaching a peak in early spring (September) and regression followed during mid-spring to early autumn (October-March). The onset of testicular recrudescence coincided with decreasing ambient temperature and photoperiod and increasing rainfall. Fat-body weight was sma" during most of the testicular recrudescence phase. with an increase commencing in spring (September). A peak in fat-body weight was reached during late spring - midsummer (October-December) and followed by a progressive decline to baseline values in winter. Plasma testosterone and androstenedione concentrations followed a bimodal annual pattern, a first peak ocx:urring in late summer/early autumn (FebruarylMarch) and the second in spring (SeptemberlOctober). The first peak coincided with the onset of testicular recrudescence and the second with maximum testicular weight.