Effect of snowmelt timing on the genetic structure of an Erythronium grandiflorum population in an alpine environment
Effect of snowmelt timing on the genetic structure of an Erythronium grandiflorum population in an alpine environment
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DOI：
10.1007/s11284-004-0032-7
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发表时间：
2005-01
影响因子：
2
通讯作者：
Hiroki Yamagishi;T. Allison;M. Ohara
中科院分区：
文献类型：
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作者：
Hiroki Yamagishi;T. Allison;M. Ohara
在高山环境中，即使在同一海拔，当地种群内的开花物候也可能有所不同。我们评估了当地地理异质性造成的融雪时间导致的开花物候差异对高山植物赤藓红种群遗传结构的影响。我们在美国科罗拉多州落基山脉前岭海拔 3,340 m 处建立了一个 250×70 m 的研究样地。由于当地地理的异质性，开花物候在很大程度上受到融雪时间的影响。 E 的二十二个补丁。大花在研究样地中被识别出来，并被分为三个物候组：早期、中期和晚期。为了表达斑块之间开花物候的差异，我们定义了物候距离并分析了遗传距离和物候距离之间的关系。此外，由于遗传距离预计与地理距离共同变化，我们还分析了斑块之间遗传距离和地理距离之间的关系。结果不仅表明斑块之间存在距离隔离，而且融雪时间的差异导致了物候上距离较远的大肠杆菌斑块。 grandiflorum，这反过来又决定了斑块之间有限的花粉流造成的遗传结构。
In alpine environments, flowering phenology can differ within local populations even at the same elevation. We assessed the effects of differences in flowering phenology due to snowmelt timing caused by local geographic heterogeneity on the genetic structure of a population of an alpine plant,Erythronium grandiflorumPursh. We established a study plot of 250×70 m at 3,340 m above sea level in the Front Range of the Rocky Mountains, CO, USA. The flowering phenology was considerably influenced by snowmelt timing due to local geographic heterogeneity. Twenty-two patches ofE. grandiflorumwere recognized in the study plot and were classified into three phenological groups: early, middle, and late. To express the differentiation of flowering phenology among the patches, we defined phenological distance and analyzed the relationship between genetic and phenological distances. Additionally, since genetic distance is expected to co-vary with geographic distance, we also analyzed the relationship between genetic distance and geographic distance among patches. The results revealed not only that isolation by distance was present among patches, but also that the differences in snowmelt timing gave rise to phenologically distant patches ofE. grandiflorum, which in turn determine the genetic structure caused by the limited pollen flow between patches.