Paz Andrea, Ibáñez Roberto, Lips Karen R, Crawford Andrew J
Department of Biological Sciences, Universidad de los Andes, A.A. 4976, Bogotá, Colombia.
Smithsonian Tropical Research Institute, Apartado 0843-03092, Panama City, Republic of Panama.
Mol Ecol. 2015 Jul;24(14):3723-37. doi: 10.1111/mec.13275. Epub 2015 Jul 14.
Hypotheses to explain phylogeographic structure traditionally invoke geographic features, but often fail to provide a general explanation for spatial patterns of genetic variation. Organisms' intrinsic characteristics might play more important roles than landscape features in determining phylogeographic structure. We developed a novel comparative approach to explore the role of ecological and life-history variables in determining spatial genetic variation and tested it on frog communities in Panama. We quantified spatial genetic variation within 31 anuran species based on mitochondrial DNA sequences, for which hierarchical approximate Bayesian computation analyses rejected simultaneous divergence over a common landscape. Regressing ecological variables, on genetic divergence allowed us to test the importance of individual variables revealing that body size, current landscape resistance, geographic range, biogeographic origin and reproductive mode were significant predictors of spatial genetic variation. Our results support the idea that phylogeographic structure represents the outcome of an interaction between organisms and their environment, and suggest a conceptual integration we refer to as trait-based phylogeography.
传统上，用于解释系统发育地理结构的假说往往援引地理特征，但通常无法对遗传变异的空间模式给出一般性解释。在决定系统发育地理结构方面，生物体的内在特征可能比景观特征发挥更重要的作用。我们开发了一种新颖的比较方法，以探究生态和生活史变量在决定空间遗传变异中的作用，并在巴拿马的蛙类群落上进行了测试。我们基于线粒体DNA序列对31种无尾目物种的空间遗传变异进行了量化，层次近似贝叶斯计算分析拒绝了在共同景观上的同时分歧。将生态变量与遗传分歧进行回归，使我们能够检验各个变量的重要性，结果表明体型、当前景观阻力、地理范围、生物地理起源和繁殖方式是空间遗传变异的重要预测因子。我们的结果支持了这样一种观点，即系统发育地理结构代表了生物体与其环境之间相互作用的结果，并提出了一种我们称之为基于性状的系统发育地理学的概念整合。
