Patterns of genetic diversity within species’ ranges can reveal important insights into effects of past climate on species’ biogeography and current population dynamics. While numerous biogeographic hypotheses have been proposed to explain patterns of genetic diversity within species’ ranges, formal comparisons and rigorous statistical tests of these hypotheses remain rare. Here, we compared seven hypotheses for their abilities to describe the geographic pattern of two metrics of genetic diversity in balsam poplar (Populus balsamifera), a northern North American tree species.

中文翻译：

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当代范围位置预测了香脂杨（Populus balsamifera L.）的遗传多样性的全范围格局。

物种范围内的遗传多样性模式可以揭示有关过去气候对物种生物地理和当前种群动态的影响的重要见解。尽管已经提出了许多生物地理学假设来解释物种范围内的遗传多样性模式，但是对这些假设进行正式比较和严格的统计检验仍然很少。在这里，我们比较了七个假设，以描述北美北部树种苦瓜（Populus balsamifera）的两个遗传多样性指标的地理模式。