Ridley Caroline E, Ellstrand Norman C
Department of Botany and Plant Sciences, University of California Riverside Riverside, CA, USA.
Evol Appl. 2010 Jan;3(1):64-76. doi: 10.1111/j.1752-4571.2009.00099.x. Epub 2009 Sep 30.
Understanding the evolution and demography of invasive populations may be key for successful management. In this study, we test whether or not populations of the non-native, hybrid-derived California wild radish have regionally adapted to divergent climates over their 150-year history in California and determine if population demographic dynamics might warrant different region-specific strategies for control. Using a reciprocal transplant approach, we found evidence for genetically based differences both between and among northern, coastal and southern, inland populations of wild radish. Individual fitness was analyzed using a relatively new statistical method called 'aster modeling' which integrates temporally sequential fitness measurements. In their respective home environments, fitness differences strongly favored southern populations and only slightly favored northern populations. Demographic rates of transition and sensitivities also differed between regions of origin, suggesting that the most effective approach for reducing overall population growth rate would be to target different life-history stages in each region.
了解入侵种群的进化和种群统计学特征可能是成功管理的关键。在本研究中，我们测试了非本地的、杂交衍生的加州野生萝卜种群在其于加州150年的历史中是否已在区域上适应了不同的气候，并确定种群动态是否需要针对不同区域采取特定的控制策略。通过相互移植的方法，我们发现了野生萝卜在北部、沿海以及南部、内陆种群之间和种群内部基于遗传差异的证据。使用一种名为“星号建模”的相对较新的统计方法分析个体适合度，该方法整合了时间上连续的适合度测量值。在各自的原生环境中，适合度差异强烈有利于南部种群，对北部种群的有利程度则较弱。不同起源区域之间的种群转变率和敏感性也有所不同，这表明降低总体种群增长率的最有效方法是针对每个区域的不同生活史阶段。
