Population structure and inbreeding in a rare and declining bumblebee, Bombus muscorum (Hymenoptera: Apidae)
Population structure and inbreeding in a rare and declining bumblebee, Bombus muscorum (Hymenoptera: Apidae)
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DOI：
10.1111/j.1365-294x.2006.02797.x
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发表时间：
2006-03-01
影响因子：
4.9
通讯作者：
Goulson, D
中科院分区：
文献类型：
--
作者：
Darvill, B;Ellis, JS;Goulson, D
由于栖息地的丧失，许多生物的种群数量下降并变得支离破碎。脊椎动物保护策略通常考虑遗传因素，但其在无脊椎动物种群的重要性知之甚少。大黄蜂是重要的授粉者，许多物种都经历了急剧下降。作为单雄蕊的社会性超翅类，它们可能特别容易受到近亲繁殖的影响，因为它们的有效种群规模很小。我们研究了一个大黄蜂物种的碎片化种群，在一个模型岛屿系统，并在英国大陆，它是罕见的和下降。我们使用微卫星研究：人口遗传结构和基因流;遗传多样性，人口规模和隔离之间的关系;（不育）二倍体男性的频率-近亲繁殖的指标。我们发现显着的遗传结构（θ = 0.12）和隔离的距离。无论是在海洋岛屿上还是在大陆上，相距> 10公里的种群都有显著的差异。相对于密切相关的共同物种，遗传多样性减少，孤立的种群表现出进一步的减少。在16个群体中，10个群体表现为近期交配，3个群体表现为二倍体雄性生殖。这些结果表明，这种稀有昆虫的生存种群遭受近亲繁殖的地理隔离的结果。社会hyperterans保护的影响进行了讨论。
Owing to habitat loss populations of many organisms have declined and become fragmented. Vertebrate conservation strategies routinely consider genetic factors, but their importance in invertebrate populations is poorly understood. Bumblebees are important pollinators, and many species have undergone dramatic declines. As monoandrous social hymenopterans they may be particularly susceptible to inbreeding due to low effective population sizes. We study fragmented populations of a bumblebee species, on a model island system, and on mainland Great Britain where it is rare and declining. We use microsatellites to study: population genetic structuring and gene flow; the relationships between genetic diversity, population size and isolation; and frequencies of (sterile) diploid males -an indicator of inbreeding. We find significant genetic structuring (theta = 0.12) and isolation by distance. Populations > 10 km apart are all significantly differentiated, both on oceanic islands and on the mainland. Genetic diversity is reduced relative to closely related common species, and isolated populations exhibit further reductions. Of 16 populations, 10 show recent bottlenecking, and 3 show diploid male production. These results suggest that surviving populations of this rare insect suffer from inbreeding as a result of geographical isolation. Implications for the conservation of social hymenopterans are discussed.