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首页> 外文期刊>Fisheries Research >Inbreeding in the exploited limpet Patella aspera across the Macaronesia archipelagos (NE Atlantic): Implications for conservation
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Inbreeding in the exploited limpet Patella aspera across the Macaronesia archipelagos (NE Atlantic): Implications for conservation

机译：在Macaronesia Archipelagos（Ne Atlantic）的被剥削的缪贝尔·艾珀拉融合了近亲繁殖：保护造成保护

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摘要

The genetic erosion of populations exposed to human exploitation plays a detrimental role on a species ability to adapt to changing environmental conditions. The Macaronesia (NE Atlantic) endemic limpet Patella aspera (Roding 1798) has been subject to overexploitation throughout its geographic distribution. We analysed 841 limpet specimens from eleven islands across the archipelagos of Azores, Madeira and Canaries. Results from 11 nuclear microsatellite markers showed significant population structure between populations from Azores and populations from Madeira and Canaries, and absence of current or historic gene flow between these. M-ratios showed that both population clusters have experienced demographic changes over time. Heterozygote deficits were common across populations, which can be better accounted for by inbreeding than by null alleles or Wahlund effect. Such levels of inbreeding are likely a consequence of a significant reduction of reproductive. units due to decades of intensive exploitation. As a sequential protandrous hermaphrodite, the size-selective harvesting of larger individuals likely fosters unbalanced sex-ratios and a consequent reproductive shortage. A recent compensatory hypothesis suggests that males are compensating the removal of larger females by undergoing sex change earlier and presumably at smaller sizes, as an adaptive response of the species under high size-biased fishing pressure. Despite such response, a dramatic reduction of Ne emerging from a large variation in the reproductive success due to overfishing and artificial genetic drift, can simply explain the inbreeding scenario observed in this Macaronesia endemic key species. This study provides valuable insights for management and conservation of P. aspera throughout Macaronesia.
机译：暴露于人类剥削的群体的遗传侵蚀在适应环境条件的物种的能力中起着不利作用。 Macaronesia（NE Atlantic）的特点恒星髌骨Aspera（棒1798）在整个地理分布过程中一直受到过度开采的影响。我们分析了来自亚速尔群岛，马德拉队和金丝雀的群岛的1141颗峡谷标本。 11个核微卫星标记的结果显示出来自马德拉和大理石的亚速尔群岛和人群的群体之间的群体结构，并且在这些中没有当前或历史基因流动。 M比率表明，两种人口集群都会随着时间的推移经历了人口变化。杂合子赤字在群体中是常见的，这可以通过近溴而不是通过零等位基因或Wahlund效应来更好地占据。这种近亲繁殖的水平可能是对生殖的显着减少的结果。由于数十年的密集开采，单位。作为一种顺序强度雌雄同体，大小选择较大个体的选择性收获可能涉及不平衡的性别比率和随之而来的生殖短缺。最近的补偿性假设表明，雄性通过更早地进行性能变化来补偿较大的女性的去除，并且可能在较小的尺寸下作为物种在高尺寸偏向的钓鱼压力下的适应性响应。尽管存在这种反应，因此由于过度捕捞和人工遗传漂移而从大型生殖成功的大变异中产生了显着减少，可以简单地解释在这种可卡蒙酮的特有关键物种中观察到的近亲繁殖情景。本研究为在印度卡蒙的Macaronesia提供了对P. Aspera的管理和保护的有价值的见解。

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