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首页> 外文期刊>Molluscan Research >Seasonal changes of progesterone and testosterone concentrations throughout gonad maturation stages of the Mexican octopus, Octopus maya (Octopodidae: Octopus)
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Seasonal changes of progesterone and testosterone concentrations throughout gonad maturation stages of the Mexican octopus, Octopus maya (Octopodidae: Octopus)

机译：墨西哥章鱼，八达通玛雅鱼的性腺成熟阶段，孕酮和睾丸激素浓度的季节性变化（章鱼科：八达通）

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Variations in progesterone (P-4) and testosterone (T) levels in the gonad of Octopus maya from Sisal in Yucatan State, Mexico, were investigated by radioimmunoassays and in relation to four gonad maturation stages (GMS) and to the reproductive cycle, as represented by two maturity indices (microscopic MiMI' and macroscopic MaMI'). According to the GMS and the maturity indices, the reproductive season of O. maya from Yucatan occurred from February to June. In females, P-4 and T displayed the same pattern, with a tendency to increase at the same time, although on average, P-4 had seven-fold higher concentrations than T. In contrast, P-4 and T in male gonads displayed a different pattern, where T concentrations were relatively stable throughout all of the study months. In the female gonad P-4 was lowest (close to 0pgg(-1)) during both developing (GMS-I) and maturing (GMS-II) stages, and increased (189 +/- 53pgg(-1)) approaching the mature stage (GMS-III) to a maximum value of 611pgg(-1). Concentrations of T in the male gonad were lowest (106 +/- 9pgg(-1)) during the maturing stage (GMS-II) and increased up to the mature stage (GMS-III), reaching a maximum of 440pgg(-1). Pearson's correlation (r) between hormones and maturity indices showed strong relationships for females (around 0.4 and -0.7; p<0.05), but there were negligible or weak relationships for males (0.2 and -0.1; p>0.05). Hormone correlations in females were inverse with MaMI and direct with MiMI. Our major findings showed that gonadal P-4 levels were elevated during GMS-III and GMS-IV (i.e. periods of vitellogenic oocytes), where the characteristic aspect is an ovary with very high oocyte diameters, with the primary follicle cells deeply infolded in the ooplasm for yolk synthesis. These results suggested a synchrony between P-4 and the process of folliculogenesis, and in turn, vitellogenesis.
机译：通过放射免疫法研究了墨西哥尤卡坦州剑麻的章鱼玛雅章鱼性腺中孕酮（P-4）和睾丸激素（T）的变化，并与四个性腺成熟阶段（GMS）和生殖周期相关联。用两个成熟度指标（微观MiMI'和宏观MaMI'）表示。根据GMS和成熟度指数，尤卡坦州玛雅鱼的繁殖季节发生在2月至6月。在雌性中，P-4和T表现出相同的模式，并有同时增加的趋势，尽管平均而言，P-4的浓度比T高七倍。相反，雄性腺中的P-4和T表现出不同的模式，在整个研究月份中T浓度相对稳定。在雌性生殖腺中，P-4在发育阶段（GMS-I）和成熟阶段（GMS-II）最低（接近0pgg（-1）），并且在接近生殖腺阶段时增加（189 +/- 53pgg（-1））。成熟阶段（GMS-III）达到最大值611pgg（-1）。雄性腺中T的浓度在成熟阶段（GMS-II）最低（106 +/- 9pgg（-1）），并增加到成熟阶段（GMS-III），最高达到440pgg（-1） ）。激素与成熟指数之间的皮尔逊相关性（r）显示，女性之间的关系很强（大约为0.4和-0.7; p <0.05），而男性之间的关系则微不足道或微弱（0.2和-0.1; p> 0.05）。女性中的激素相关性与MaMI呈负相关，而与MiMI呈正相关。我们的主要发现表明，在GMS-III和GMS-IV（即卵黄形成卵母细胞的时期）期间，性腺P-4的水平升高，其特征是卵巢具有很高的卵母细胞直径，初级卵泡细胞深深地折叠在卵母细胞中。用于卵黄合成的卵质。这些结果表明P-4与卵泡发生过程以及卵黄发生过程之间是同步的。

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