10.1371/journal.pone.0038056.g013 Walter R. Tschinkel Walter R. Tschinkel Location of the samples taken from the 2004 and 2008 images used for detailed comparison of the two years. Public Library of Science 2013 samples taken 2004 2008 images 2013-02-20 03:30:46 Figure https://plos.figshare.com/articles/figure/_Location_of_the_samples_taken_from_the_2004_and_2008_images_used_for_detailed_comparison_of_the_two_years_/290213 <p>Differences between them allowed the calculation of turnover rates and circle lifespan (see text).</p>