Captivity masks inbreeding effects on male mating success in butterflies
Captivity masks inbreeding effects on male mating success in butterflies
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DOI：
10.1038/nature01713
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发表时间：
2003-07-10
期刊：
影响因子：
64.8
通讯作者：
Brakefield, PM
中科院分区：
文献类型：
--
作者：
Joron, M;Brakefield, PM
与世隔绝的小种群的遗传多样性往往低于核心种群，导致更高的纯合度，这可能会阻碍它们的长期生存(1-4)。从圈养动物和实验室动物来看，近亲交配导致的生物体适合性下降是众所周知的。这种近亲交配可能会对生活史特征和生存产生严重的有害影响(5-11)，并可能对种群保护的成功至关重要(2，4，12)。由于家系在野外很难追踪，大多数野外研究都使用了标记基因座来证明适合度随着纯合度的增加而下降(1，13，14)。很少有人对野外近亲交配的影响进行实验探索(15)，或者将实验室观察结果与野外条件进行比较(8，9)。在这里，我们使用了一种在交配过程中转移标记灰尘的技术，我们表明，在自由飞行的条件下，笼子里圈养的近亲繁殖雄性蝴蝶交配成功率的小幅下降会大大加剧。我们的结果对保护和性选择研究具有重要意义，因为它们表明，交配模式背后的行为可以受到近亲交配历史或任何限制性实验条件的深刻影响。
Small isolated populations are frequently genetically less diverse than core populations, resulting in higher homozygosity that can hamper their long-term survival(1-4). The decrease in fitness of organisms owing to matings between relatives is well known from captive and laboratory animals. Such inbreeding can have strongly deleterious effects on life-history traits and survival(5-11), and can be critical to the success of population conservation(2,4,12). Because pedigrees are hard to follow in the wild, most field studies have used marker loci to establish that fitness declines with increasing homozygosity(1,13,14). Very few have experimentally explored the effects of inbreeding in the wild(15), or compared observations in the laboratory with field conditions(8,9). Here, using a technique involving the transfer of marker dusts during copulation, we show that a small decrease in mating success of captive inbred male butterflies in cages is greatly accentuated in conditions with unconstrained flight. Our results have important implications for conservation and for studies of sexual selection because they show that the behaviours underlying patterns of mating can be profoundly influenced by a history of inbreeding or by any restraining experimental conditions.