...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Genetic heterogeneity in populations of the Mediterranean shore crab, Carcinus aestuarii (Decapoda, Portunidae), from the Venice Lagoon
【24h】

Genetic heterogeneity in populations of the Mediterranean shore crab, Carcinus aestuarii (Decapoda, Portunidae), from the Venice Lagoon

机译：威尼斯泻湖地中海沿岸蟹Carcinus aestuarii（Decapoda，Portunidae）种群的遗传异质性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Heterogeneity in genetic composition among recruits, mostly due to a large variance in reproductive success mediated by oceanographic processes, has been reported for marine species but is less understood in coastal lagoons' organisms. Temporal genetic variation in natural populations of the Mediterranean shore crab Carcinus aestuarii was quantified over a multi-year sample. A total of 486 adult crabs were collected at eight different sites of the Venice Lagoon during the period 2005-2007 and screened for genetic variation using 11microsatellite loci. Two additional samples (N= 115) from neighbouring sites, located approximately 100 km North and South to the Venice Lagoon, were included for the sake of comparison. Our results show significant differences in allelic frequencies at the micro-geographic scale of the Venice Lagoon, observed between sites of collection, typologies of habitat, and areas with different class of ecological risk or pattern of hemocyanin expression. However, this pattern was not constant between years, with significant differences observed mainly in 2005 and 2006, but not in 2007. Our results indicate significant temporal differences suggesting the existence of dynamic processes that act on the genetic pool of this species. Although natural selection and gene flow might play a role, we suggest that genetic drift linked to large variation in the reproductive success of individuals is the most probable scenario to explain the local genetic patterns of differentiation in the Mediterranean shore crab. Our study, by providing the first evidence for the existence of genetic differences in this species at the micro-geographic scale, suggests that a better comprehension of the link between reproduction, recruitment and oceanography is critical to understand how colonization and maintenance of genetic variation is achieved in ephemeral and vulnerable environments such as coastal lagoons.
机译：据报道，新兵之间的遗传组成具有异质性，主要是由于海洋学过程介导的繁殖成功差异很大，但沿海泻湖的生物却鲜为人知。在多年样本中对地中海沿岸蟹Carcinus aestuarii自然种群的时间遗传变异进行了量化。在2005-2007年期间，在威尼斯泻湖的八个不同地点共收集了486只成年螃蟹，并使用11个微卫星基因座筛选了其遗传变异。为了比较起见，还包括了位于威尼斯泻湖南北约100公里处的相邻站点的另外两个样本（N = 115）。我们的研究结果表明，在威尼斯泻湖的微观地理范围内，等位基因频率存在显着差异，在采集地点，栖息地类型以及具有不同生态风险或血蓝蛋白表达模式的区域之间观察到。但是，这种模式在几年之间并不是恒定不变的，主要在2005年和2006年观察到显着差异，但在2007年却没有。我们的结果表明，显着的时间差异表明存在作用于该物种遗传库的动态过程。尽管自然选择和基因流动可能起一定作用，但我们认为，与个体繁殖成功的巨大差异相关的遗传漂移是解释地中海沿岸蟹的局部遗传模式的最可能情况。我们的研究通过提供有关该物种在微观地理范围内遗传差异的第一个证据，表明对繁殖，募集和海洋学之间联系的更好理解对于了解如何定居和维持遗传变异至关重要。在沿海泻湖等短暂而脆弱的环境中实现。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号