全杂交蛙种群倍性组成与生态条件的关系

Q2 Agricultural and Biological Sciences Evolutionary Ecology Research Pub Date : 2010-01-01 DOI:10.5167/UZH-38402
C. Jakob, Martina Arioli, H. Reyer
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引用次数: 15

摘要

问题:如何解释全杂交蛙种群中二倍体(LR)和两种三倍体蛙(LLR、LRR)的比例差异?假设:有利于一个亲本物种(LL)或另一个亲本物种(RR)的生态条件也有利于携带各自基因组两个拷贝的三倍体(剂量效应),而二倍体在中间条件下占主导地位。生物:欧洲水蛙(Pelophylax esculentus)研究地点:瑞典南部斯科讷省34个天然池塘。方法:捕获青蛙3000余只,利用微卫星测定其基因型,并将倍性组成与池塘形态、植被、水体理化参数等不相关的生态参数进行关联。结论:从小型孤立池塘的LRR为主向大型湿地池塘的LRR为主转变。这与亲本物种LL和RR分别对小水体和大水体的偏好相似。池塘植被和水体理化参数对亲本种的影响在全杂交群体中没有发现。这表明环境参数对全杂交群体基因型组成的影响小于含有亲本种的群体。塘与塘之间LR、LLR和LRR比例的差异似乎可以用配子产量的差异和遗传模式的差异来更好地解释。
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Ploidy composition in all-hybrid frog populations in relation to ecological conditions
Question: What explains the differences in ratios of diploid (LR) and two types of triploid frogs (LLR, LRR) among all-hybrid frog populations? Hypothesis: Ecological conditions favouring one (LL) or the other (RR) parental species also favour those triploids that carry two copies of the respective genome (dosage effect), whereas diploids dominate under intermediate conditions. Organism: European water frog (Pelophylax esculentus). Field site: Thirty-four natural ponds in the province of Skane, southern Sweden. Methods: We caught more than 3000 frogs, determined their genotypes with microsatellites, and related the ploidy composition to several uncorrelated ecological parameters, including pond morphology, vegetation, and physical and chemical water parameters. Conclusions: We found a shift from predominantly LLR in small isolated ponds to more LRR in large wetland ponds. This parallels the preferences of the parental species LL and RR for small and large bodies of water, respectively. The effects that pond vegetation and physico-chemical water parameters exert on the parental species were not found in all-hybrid populations. This suggests that environmental parameters affect the genotype composition of all-hybrid populations less than populations containing the parental species. Pond-to-pond differences in LR, LLR, and LRR proportions seem to be better explained by differences in gamete production and thus inheritance patterns.
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Evolutionary Ecology Research
Evolutionary Ecology Research 生物-进化生物学
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期刊介绍: Evolutionary Ecology Research publishes original research contributions focusing on the overlap between ecology and evolution. Papers may treat any taxon or be general. They may be empirical, theoretical or a combination of the two. EER prefers conceptual contributions that take intellectual risks or that test ideas.
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