Seasonal variation in testicular and fat-body weight and plasma testosterone and androstenedione concentration in the lizard Cordylus polyzonus (Sauria: Cordylidae)

Flemming, F.A. (1993)

The original publication is available at http://africanzoology.journals.ac.za/pub

Journal Article

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.

Seisoenale variasie in testes- en vetliggaamgewig en plasmatestosteroon- en -androstiendioonkonsentrasies van die akkedis Cordylus polyzonus word beskryf. Testikulere groei neem 'n aanvang in herfs (ApriO, 'n piek word bereik in die vroee lente (September) en regressie volg vanaf middel lente-vroee herfs (OktoberMaart). Die aanvang van testikulere groei val saam met 'n daling in omgewingstemperatuuren fotoperiode en 'n toename in reenval. Vetliggaamgewig is laag met die aanvang van testikulere groei en 'n toename begin in die lente (September). 'n Piek in vetliggaamgewig word bereik tydens laat lente-middel somer (OktoberDesember), gevolg deur 'n progressiewe afname na laagste waardes in die winter. Plasmatestosteroon- en -androstiendioonvlakke vertoon 'n bimodale seisoenale patroon, met 'n eerste piek in die laat somerlvroee herfs (FebruarielMaart) en 'n tweede in die lente (SeptembertOktober). Die eerste piek val saam met die aanvang van testikulire groei en die tweede piek met maksimum testikulere gewig.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/22009
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