Abstract
We studied the seasonal variations of reproductive characteristics in a wild population of the lacertid lizard Psammodromus algirus by measuring gonadal weight, germinal epithelium height, sexual steroids (testosterone, estradiol, and progesterone), and lipid reserves (in fat bodies and liver) in three phases of the reproductive cycle: early breeding (late April), late breeding (mid-June), and post-breeding season (late July). In males, testis size, germinal epithelium, and testosterone plasma levels were high in the breeding season and decreased dramatically in July. However, spermatogenesis (maximum in June) was slightly delayed with respect to testosterone secretion (peak in April), suggesting that a previous increase in testosterone levels could be necessary to stimulate the initial stages of spermatogenesis
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