活产鱼繁殖中的母体缩与乳糖缩的荷尔蒙动态
Saeid Panahi Hassan Barough1, Monserrat Suárez-Rodríguez2, Andrea S Aspbury1
1Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666, USA.
概括
激素水平与活产鱼的生育或怀孕阶段没有相关性. 然而,孕激素对于胎盘物种的妊娠至关重要,在母体供给策略之间,激素配置不同.
科学领域:
- 生殖生物学 生殖生物学
- 内分泌学 在内分泌学.
- 比较生理学比较生理学
背景情况:
- 活产鱼表现出不同的母体供给策略,包括乳糖变 (依赖卵黄) 和母体变 (胎盘营养转移).
- 这些策略可能涉及不同的生理成本和妊娠期间的荷尔蒙调节.
- 了解这些差异是理解活体生物的繁殖适应的关键.
研究的目的:
- 研究鱼类的妊娠状态,生育能力 (大小) 和类固醇激素水平 (皮质醇,雌激素,孕激素) 之间的关系,用对比的母体供应策略.
- 为了比较荷尔蒙特征及其与生殖特征的共变性,在乳糖养和母体养物种中.
- 探索与不同孕产妇投资模式相关的生理成本.
主要方法:
- 研究了三种活生生的鱼类:两种乐类 (Gambusia affinis,Xiphophorus couchianus) 和一种母类 (Heterandria formosa).
- 测量了水中的皮质醇,雌激醇和孕激素水平.
- 对每个物种的量化繁殖规模 (生育能力) 和确定妊娠阶段 ().
主要成果:
- 在任何研究的物种中,没有发现激素水平与生育或妊娠阶段之间的显著关系.
- 在Heterandria formosa中,雌激素水平与雌性质量正相关,而孕激素水平与雌性质量负相关.
- 与莱西托热性物种相比,母性性物种的平均孕激素水平较高,平均雌激素水平较低.
结论:
- 雌激素和孕激素水平随着雌性质量的变化而变化,在母性养物种Heterandria formosa.
- 截然不同的平均激素形状表明雌激素在黄体形成 (叶黄) 和孕激素在胎盘怀孕 (母体) 中的雌激素具有特定物种作用.
- 孕激素似乎对维持孕期至关重要,在母体养物种中,类似于胎盘哺乳动物.
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