缺乏宿主专业化,尽管选择性宿主在繁殖寄生虫鱼中使用
Martin Reichard1,2,3, Stephan Koblmüller4, Radim Blažek1,2
1Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.
Molecular ecology
|October 20, 2023
概括
鱼是一种繁殖寄生虫,尽管在坦加尼加湖有各种各样的鱼宿主,但它并不表现出宿主专业化. 寄生虫行为给鱼父母带来了代价,这表明鱼是一个中间的通用主义者.
科学领域:
- 进化生物学是进化的生物学.
- 寄生虫学的寄生虫学
- 鱼类学 鱼类学 鱼类学
背景情况:
- 宿主-寄生虫动态驱动共同进化的军备竞赛,可能导致宿主专业化和多样化.
- 了解繁殖寄生虫的进化是通过关注鸟类和昆虫来限制的.
- 鱼 (Synodontis multipunctatus) 在坦加尼加湖中必然会寄生于嘴里繁殖的鱼.
研究的目的:
- 为了调查鱼中是否存在共性宿主特异性血统.
- 在鸟类和昆虫系统之外,探索宿主对繁殖寄生虫的专业化.
- 评估寄生虫对鱼繁殖成功的影响.
主要方法:
- 使用从鱼胚胎中获取的基因组 (ddRAD测序) 和线粒体 (Dloop) 数据进行基因组学分析.
- 对遗传结构和共同祖先矩阵的分析.
- 在坦加尼加湖的20种鱼种类中对鱼寄生虫的实地调查.
主要成果:
- 发现四种鱼物种 (Tropheini部落) 被鱼寄生,其流行率在2%至18%之间.
- 遗传学和遗传学分析显示,鱼中没有宿主特定血统的证据.
- 寄生虫对虫父母来说是昂贵的,导致离合体尺寸更小,但与父母的大小或水深无关.
结论:
- 鱼的功能是中间的通用主义者,缺乏宿主专业化,尽管在坦加尼加湖有机会.
- 寄生症会给寄生父母带来生殖成本.
- 需要进一步的研究,以了解在繁殖寄生虫中宿主专业化的进化约束和益处.
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