One of the most important processes in maintaining genetic diversity is geneflow. Tree populations tend to maintain high levels of genetic diversity and this is partly due to long distance geneflow. Using microsatellite markers, we have examined pollen flow in species such as oak and cherry and shown that a considerable proportion of the seed is the product of pollen originating from outside the stand (Cottrell et al. 2009; Gerber et al. 2014).
Cottrell, J.E., Vaughan, S.P., Connolly, T., Sing L., Moodley, D.J. & Russell, K. (2009). Contemporary pollen flow, characterization of the maternal ecological neighbourhood and mating patterns in wild cherry (Prunus avium L.). Heredity 103 (2) 118-128.
Gerber, S. Chadoeuf, J. Gugerli, F. Lascoux, M. Buiteveld, J. Cottrell J. et al.2014 High rates of gene flow by pollen and seed in oak populations across Europe. PlosOne. January 2014 | Volume 9 | Issue 1 | e85130 DOI: 10.1371/journal.pone.0085130