Figure 2
From: Benthic jellyfish act as suction pumps to facilitate release of interstitial porewater
Porewater barriers. Release of porewater was highest in the control group and ring treatments, and absent in both the disk and perforation treatments, as well as the trials without jellyfish. Besides an unaltered control treatment, experimental treatments consisted of (A) an impermeable ring surrounding the animal, (B) an impermeable disk below the bell, and (C) a 6 mm perforation through the bell into the exumbrellar cavity. (D) Differences between treatments were found to be significant (one-way Anova, f = 8.61, p < 0.0001) and post-hoc comparisons showed that the two treatments with high porewater release rate (A) and low porewater release rates (B) were not significantly different within groups, but significantly different between groups (Tukey HSD, α = 0.05). Negative values in low-release treatments (B) are likely due to diffusion of fluorescein inadvertently released during experimental setup into the clean cap sand.
