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首页> 外文期刊>Marine biology >Reproduction of the invasive slipper limpet, Crepidula fornicata, in the Bay of Brest, France
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Reproduction of the invasive slipper limpet, Crepidula fornicata, in the Bay of Brest, France

机译：法国布列斯特湾的侵入性拖鞋帽贝Crepidula fornicata的繁殖

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The reproduction of Crepidula fornicata was studied in the Bay of Brest in order to characterise the first step of the reproductive cycle of this invasive species. The survey was carried out from 2000 to 2003 and different parameters were measured, namely, the percentage of the different sexual stages, the straight length of the shell and the percentage of brooding females using a survey of the embryonic development and the fecundity. The juvenile frequency increases generally from mid-June or mid-August, depending on the year. In 2001 and 2003, a first peak was observed as early as May, but it was followed by a rapid disappearance of the individuals. The sex-ratio female/male increased from 0.22 to 0.46 between 2001 and 2003. The sex change between intermediates and females took place mainly in summer and was well marked in 2001 and 2003. The survey of the embryonic development in the egg capsules brooded by the females provided an annual phenology of the laying and hatching processes. The laying period extends from February to September with three to four major periods of egg-laying per year and corresponding hatching periods about 1 month later. Each female lays two to four times per year on average. The first egg-laying concerned fewer females than subsequent ones, except in 2003, and exhibited a higher fecundity. The annual mean of the number of eggs for each stage was not significantly different, thus indicating no significant mortality rate during embryonic development. For the C. fornicata population in the Bay of Brest, several reproductive characteristics tend to highlight its invasive capacity: (1) a long reproductive period, (2) reproduction in a 'multi-trials' process equivalent to a spreading out of the risks and (3) a relatively high fecundity.
机译：为了表征这种入侵物种繁殖周期的第一步，在布雷斯特湾研究了Crepidula fornicata的繁殖。该调查于2000年至2003年进行，通过对胚胎发育和繁殖力的调查，测量了不同的参数，即不同性阶段的百分比，壳的笔直长度和育雏雌虫的百分比。少年频率通常从6月中旬或8月中旬开始增加，具体取决于年份。在2001年和2003年，最早的高峰出现在5月，但随后迅速消失。在2001年至2003年之间，雌/雄的性别比从0.22增加到0.46。中间体和雌性之间的性别变化主要发生在夏季，并在2001年和2003年表现出明显的特征。雌性对产卵和孵化过程提供了年度物候信息。产蛋期从二月到九月，每年有三到四个主要的产卵期，相应的孵化期约在一个月后。每位女性平均每年产卵2至4次。第一次产卵的女性比随后的女性少，除了2003年，而且产卵能力更高。每个阶段卵子的年平均数没有显着差异，因此表明在胚胎发育过程中没有明显的死亡率。对于布列斯特湾的C. fornicata种群，一些繁殖特征倾向于突出其入侵能力：（1）繁殖期长，（2）以“多重试验”过程进行繁殖，等同于分散风险。 （3）繁殖力较高。

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