Comparison of temporal effective population size estimates within each of the five study springs.

<p>Values were estimated using four different statistical methods implemented in four different programs (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0028645#s2" target="_blank">methods</a>). White bars indicate values of N<sub>e</sub> for pre flood (1988–1990) snail populations and grey bars indicate values of N<sub>e</sub> for post flood (1995, 2002–2006) snail populations. Standard errors are indicated on each estimate.</p>