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在混合区中的虫小鼠
R D Sage1, D Heyneman, K C Lim
1Department of Biochemistry and Museum of Vertebrate Zoology, University of California, Berkeley, California 94720, USA.
Nature
|November 6, 1986
概括
杂交小鼠种群表现出明显更高的寄生虫虫负载,这表明健康状况下降,并作为物种之间的遗传障碍. 这表明由于杂交易感性而导致的潜在基因流动中断.
科学领域:
- 遗传学 是一个遗传学.
- 寄生虫学的寄生虫学
- 进化生物学 进化生物学
背景情况:
- 研究物种之间的遗传障碍对于理解物种化至关重要.
- 混合区为研究遗传不相容性和适应性提供了独特的机会.
- 寄生虫感染可以显著影响宿主健康和生殖成功.
研究的目的:
- 为了分析Mus musculus和Mus domesticus之间的遗传障碍.
- 为了研究寄生虫负载在杂交小鼠种群中的作用.
- 为了确定杂交易感寄生虫是否有助于降低适应性.
主要方法:
- 检查了两种小鼠物种及其天然杂交物种的寄生虫 (pinworms,线虫,线虫) 负担.
- 分析了德国南部一个狭窄的杂交区的小鼠.
- 将杂交小鼠中的寄生虫负载与纯种群中的寄生虫负载进行比较.
主要成果:
- 杂交区内的小鼠表现出不成比例的高数量的针虫 (每肠500多个) 与对照 (平均每肠40个) 相比.
- 其他线虫和带虫也在杂交区小鼠中显示出非随机的过度分布.
- 这些发现表明杂交小鼠异常容易受到寄生虫的侵害.
结论:
- 杂交种群可能由于影响寄生虫耐药性的遗传不相容性而降低了适应性.
- 杂交区可以充当遗传沉没点,阻碍母物种之间的基因流动.
- 混合区内的环境因素似乎不是增加感染率的主要原因.
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