Inbreeding depression and inbreeding avoidance in a natural population of guppies (Poecilia reticulata).
Inbreeding depression and inbreeding avoidance in a natural population of guppies (Poecilia reticulata).
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孔雀鱼（Poecilia reticulata）自然种群中的近交抑制和近交避免。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
K. Hughes
中科院分区：
文献类型：
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作者：
Ashley M. Johnson;G. Chappell;A. Price;F. Rodd;Robert Olendorf;K. Hughes
在强大的自然选择面前保持遗传变异是进化生物学中一个长期存在的问题。种群内变异最极端的例子之一是雄性特立尼达孔雀鱼(Poecilia Reticata)多态的、由基因决定的颜色模式。雌性对稀有或新奇图案的交配偏好被认为是维持这种变异的一个因素。这种偏好的起源尚不清楚，尽管近亲交配避免被提出作为一种机制。当种群表现出近亲繁殖衰退并且近亲之间存在交配机会时，避免近亲繁殖是有利的。为了确定自然孔雀鱼种群是否满足这些条件，我们使用多态分子标记评估了交配和繁殖模式。雌性与亲缘关系较少的雄性交配的后代多于与亲缘关系较大的雄性交配的后代。此外，女性更有可能与血缘关系较小的男性交配，但这一趋势只有轻微的显著意义。雄性杂合度与交配成功率和子代繁殖数呈正相关，这与成年雄性适应能力的强烈近亲繁殖抑制相一致。这些结果为野生孔雀鱼种群的交配模式提供了实质性的洞察：强烈的近亲繁殖抑制会发生，个体倾向于避免与亲戚交配。
Maintenance of genetic variation in the face of strong natural selection is a long-standing problem in evolutionary biology. One of the most extreme examples of within-population variation is the polymorphic, genetically determined color pattern of male Trinidad guppies (Poecilia reticulata). Female mating preference for rare or novel patterns has been implicated as a factor in maintaining this variation. The origin of this preference is not understood, although inbreeding avoidance has been proposed as a mechanism. Inbreeding avoidance is advantageous when populations exhibit inbreeding depression and the opportunity for mating between relatives exists. To determine whether these conditions are met in a natural guppy population, we assessed mating and reproductive patterns using polymorphic molecular markers. Females produced more offspring with less-related males than with more-related ones. In addition, females were more likely to have mated with lessrelated males, but this trend was only marginally significant. Male heterozygosity was positively correlated with mating success and with the number of offspring sired, consistent with strong inbreeding depression for adult male fitness. These results provide substantial insight into mating patterns of a wild guppy population: strong inbreeding depression occurs, and individuals tend to avoid mating with relatives.
影响因子：
3.3
作者：
D. Houle
通讯作者：
D. Houle