Placement of the 22 samples along the first two PCA axes (GEnALex); samples of <i>P. multistriata</i> gathered at LTER_MC in 2008 are indicated with grey squares; those in 2009 with grey diamonds, those in 2010 with black squares, and the one in 2011 with a white diamond.

Abstract

<p>Samples 11 (2009), 19, 20, and 21 (2010), which showed a higher abundance of POP_B strains, but contained a minority of strains assigned to POP_A and others assigned as putative hybrids, are enclosed within an ellipse (see text). The two PCA axes capture 73.2% of the variability.</p