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首页> 外文期刊>Belgian Journal of Zoology >Variation in reproductive parameters of Rhinella arenarum (HENSEL, 1867) (Anura: Bufonidae) between the reproductive and post-reproductive periods
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Variation in reproductive parameters of Rhinella arenarum (HENSEL, 1867) (Anura: Bufonidae) between the reproductive and post-reproductive periods

机译：生殖期和生殖后时期莱茵河蛙生殖参数的变化（HENSEL，1867）（Anura：Bufonidae）

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摘要

We compared reproductive parameters of Rhinella arenarum in a wetland of the Monte in Argentina during reproductive and post-reproductive seasons. Individuals were collected at random, monthly from November 2001 to October 2002. August through November was considered the reproductive period, and December through April was considered the post-reproductive period. Of the 116 adults, 75 were males and 41 were females. The reproductive parameters measured included body mass, fat body mass, number of mature ova, ova size, and testicular volume. There were significant differences between the reproductive and post-reproductive periods in females for body mass, fat body mass, and number of mature ova. Likewise, males also had significant differences between these periods for body mass and fat body mass. Apparently, R. arenarum has an opportunistic and continuous reproductive strategy. Entering dormancy with large fat bodies and testes in apparent spermatogenesis allows males to reproduce immediately after emerging in the spring. However, females have mature but fewer ova during this period, which is a reproductive feature shared by most temperate amphibians. Our data, and the primarily tropical distribution of R. arenarum, suggest that this species recently invaded the temperate region wherein males retained acyclic reproductive activity and females, owing to their higher reproductive costs, have evolved cyclic reproduction.
机译：我们比较了生殖季节和生殖后季节在阿根廷蒙特湿地的莱茵兰are藜的生殖参数。从2001年11月至2002年10月每月随机收集个体。8月至11月被视为生殖期，12月至4月被视为生殖后时期。在116名成年人中，男性75名，女性41名。所测量的生殖参数包括体重，脂肪体重，成熟卵子的数量，卵子大小和睾丸体积。在雌性的生殖期和生殖期之后，体重，脂肪体重和成熟卵的数量存在显着差异。同样，男性在这些时期的体重和脂肪体重也有显着差异。显然，竞技场具有机会主义和持续的繁殖策略。在明显的精子发生过程中进入具有大型脂肪体和睾丸的休眠状态，可使雄性在春季出现后立即繁殖。然而，在此期间雌性的卵成熟但较少，这是大多数温带两栖动物共有的生殖特征。我们的数据以及R. arenarum的主要热带分布表明，该物种最近入侵了温带地区，该地区的雄性保持无环生殖活动，而雌性则由于其较高的繁殖成本而进化出周期性繁殖。

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