Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus
Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus
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DOI：
10.1007/s10641-005-2196-6
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发表时间：
2005-08-01
影响因子：
1.4
通讯作者：
Hagiwara, A
中科院分区：
文献类型：
--
作者：
Grageda, MVC;Sakakura, Y;Hagiwara, A
我们比较了红树林鳉鱼 Rivulus marmoratus 的两个克隆品系（PAN-RS 和 DAN）在恒定饲养条件下的生活史特征，如繁殖力、性别比例、生殖周期、性成熟年龄、胚胎期、卵大小、早期生长和形态。我们发现生长和繁殖努力之间存在正相关关系。 PAN-RS 品系的繁殖力显着高于 DAN 品系。性别比例显着不同，DAN 比 PAN-RS 产生更多的初生雄性。品系之间的产卵和排卵周期没有明显差异。孵化后 0 至 100 天，PAN-RS 的生长速度明显高于 DAN，然而，两个品系的性成熟年龄、胚胎期、卵大小以及形态和分枝特征（脊椎和鳍条计数）没有差异。 PAN-RS 的高繁殖力可能会增加后代存活的机会，而 DAN 中较小尺寸的性成熟可能使它们能够更早地投入繁殖以提高繁殖成功率。 PAN-RS 和 DAN 生活史特征的变化可能是其自然栖息地的适应策略，该栖息地由环境高度可变的红树林河口组成。
We compared life-history traits such as fecundity, sex ratio, reproductive cycle, age at sexual maturity, embryonic period, egg size, early growth and morphology in two clonal strains (PAN-RS and DAN) of the mangrove killifish, Rivulus marmoratus, under constant rearing conditions. We found a positive relationship between growth and reproductive effort. Fecundity was significantly higher in the PAN-RS strain than in the DAN strain. The sex ratio was significantly different, with DAN producing more primary males than PAN-RS. Spawning and ovulation cycle did not clearly differ between the strains. PAN-RS showed a significantly higher growth rate than DAN from 0 to 100 days after hatching, however, age at sexual maturity, embryonic period, egg size, and morphometric and meristic characteristics (vertebral and fin-ray counts) did not differ between the two strains. The high fecundity of PAN-RS may provide an increased chance of offspring survival, while the attainment of sexual maturity at a smaller size in DAN may allow them to invest earlier in reproduction to increase breeding success. Variations in the life-history traits of PAN-RS and DAN may be adaptive strategies for life in their natural habitat, which consists of mangrove estuaries with a highly variable environment.