Comparison of egg clutch characteristics by population.

<p>White bars represent <i>Pomacea canaliculata</i> and grey bars represent <i>Pomacea maculata</i>. Open and hash marked bars signify data from native and non-native populations, respectively. Lower case letters denote statistically significant differences and error bars symbolize one standard deviation. We estimated clutch volume (F) using the Ellipsoid Model (length×width×depth×π/6).