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首页> 外文期刊>Bulletin de la Societe Zoologique de France >CYCLE SEXUEL DE DONAX TRUNCULUS (MOLLUSQUE BIVALVE) DU GOLFE DE TUNIS
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CYCLE SEXUEL DE DONAX TRUNCULUS (MOLLUSQUE BIVALVE) DU GOLFE DE TUNIS

机译：来自突尼斯湾的唐纳克斯鞭毛性循环（双壳软体动物）

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摘要

The reproductive cycle of Donax trunculus (Mollusca : Bivalvia) at two sandy beaches located in the Northeast of the Gulf of Tunis (Kalaat Andalous and Raoued), was studied monthly, from November 1999 to October 2000. The physical and chemical characteristics, temperature, salinity, dissolved oxygen and pH of the two stations were measured each month. For the histological study, a sample of thirty mature individuals, shell length 18 to 30 mm, was collected at each station. Gonad development was analysed using the histological method proposed by MARTOJA and MARTOJA (1967). Microscopic examination of gonad sections allowed the assignment of each specimen to a stage of gonadal development according to the maturity scale of LUBET (1959). The condition index of WALNE and MANN (1975) was applied to forty individuals/station/month. This complementary method allowed a better understanding of the fluctuations within the sexual cycle. Both females and males showed a synchronism in the gametogenic evolution throughout the period studied. The sexual cycle was extended in time and even continuous. Gametogenic activity started with the decreasing temperature in December and ended in July-August. Spawning activity began in January and continued until July or in some cases August. After the summer spawning, animals were in the resting stage until November. During this period, individuals showed a weight increase due to the accumulation of reserves in the somatic tissue. The inactive stage did not concern the entire population: some mature specimens were observed throughout the period studied showing different stages of maturity.
机译：1999年11月至2000年10月，每月对突尼斯Don（Mollusca：Bivalvia）在位于突尼斯湾东北部（Kalaat Andalous和Raoued）的两个沙滩的繁殖周期进行研究。其理化特性，温度，每月测量两个站的盐度，溶解氧和pH。为了进行组织学研究，在每个站收集了30个壳长为18至30 mm的成熟个体的样本。使用MARTOJA和MARTOJA（1967）提出的组织学方法分析了性腺发育。显微镜检查性腺切片，根据LUBET（1959）的成熟度，将每个标本分配到性腺发育阶段。 WALNE和MANN的病情指数（1975年）适用于40个人/站/月。这种互补的方法可以更好地了解性周期内的波动。在整个研究期间，雌性和雄性均表现出配子发生的同步性。性周期随时间延长甚至持续。致配子活动始于12月的温度下降，并于7月至8月结束。产卵活动始于一月，一直持续到七月，有时甚至是八月。夏季产卵后，动物一直处于休息阶段，直到11月。在此期间，由于身体组织中储备的积累，个体体重增加。不活跃阶段并不涉及整个人口：在整个研究期间观察到一些成熟标本，显示出不同的成熟阶段。

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