## 3 Results  
Control (treatment C) showed constant values of salinity (=20); moreover, burrowing % was high (\(>90\%\)) during the 156 h (Table 2, Figure 3C), and the registered mortality was \(\sim\)5%. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Time (h)** & **12** & **24** & **36** & **48** & **60** & **72** & **84** & **96** & **108** & **120** & **132** & **144** & **156** \\ \hline
**Treatment A** & & & & & & & & & & & & & \\ \hline Salinity & 20 & 15 & 10 & 5 & 10 & 15 & 20 & 15 & 10 & 5 & 5 & 5 & 5 \\ Burrowed (\%) & 98 & 100 & 56 & 17 & 40 & 82 & 97 & 97 & 75 & 33 & 18 & 3 & 3 \\ \(\Delta\) Burrowed & & +2 & \(-44\) & \(-39\) & +23 & +42 & +15 & 0 & \(-22\) & \(-42\) & \(-15\) & \(-15\) & 0 \\
**[on Each Salinity Variation** & & & **Decrease** & & & & & & & & & & \\
**Cycle]** & & & **[0-48 h]** & & & & & & & & & & \\  & & & \(-81\) & & & & & & & & & & \\ \hline
**Treatment B** & & & & & & & & & & & & & \\ \hline Salinity & 20 & 15 & 10 & 5 & 10 & 15 & 20 & 15 & 10 & 5 & 10 & 15 & 20 \\ Burrowed (\%) & 96 & 98 & 60 & 12 & 38 & 88 & 96 & 95 & 74 & 38 & 59 & 88 & 93 \\ \(\Delta\) Burrowed & & & +2 & \(-38\) & \(-48\) & +26 & +50 & +8 & \(-1\) & \(-21\) & \(-36\) & +21 & +29 & +5 \\ \(\Delta\) Burrowed & & & & & & & & & & & & & & \\
**[on Each Salinity Variation** & & & & & & & & & & & & & \\
**Cycle]** & & & **Decrease** & & & & & & & & & & \\  & & & & & & & & & & & & & \\  & & & & & & & & & & & & & \\  & & & & & & & & & & & & & \\ \hline
**Treatment C** & & & & & & & & & & & & & \\ \hline Salinity & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 & 20 \\ Burrowed (\%) & 90 & 93 & 100 & 100 & 100 & 100 & 100 & 100 & 100 & 96 & 95 & 91 & 90 \\ \(\Delta\) Burrowed & & & +3 & +7 & 0 & 0 & 0 & 0 & 0 & 0 & \(-4\) & \(-1\) & \(-4\) & \(-1\) \\ \hline \end{tabular}
\end{table} 
Table 2: Results of Treatment A, Treatment B and Control during the experiment (156 h), showing: Salinity conditions; Burrowed %-considered the % of burrowed individuals/treatment (N\({}_{\text{treatment}}\) = 60) at each 12 h observation moment; \(\Delta\) Burrowed every 12 h and per salinity variation cycle (for more details on experimental conditions of Treatment A, Treatment B and Control, please see Section 2.2 and Table 1). Figure 3: (**A-C**). Salinity variation and proportion of burrowed individuals _per_ treatment, over the experiments duration time (156 h)—Treatment A (plot A. ), Treatment B (plot B.) and Control (plot C.). Treatment A: (i) during the 1 st salinity variation cycle the percentage of buried individuals was \(\sim\)100% at salinity 20 (12 h) and 15 (24 h), (Table 2, Figure 3A), decreasing to 56% at salinity 10 (36 h) and \(<\)20% at salinity 5 (48 h), and then it increased with salinity increment to 40% at salinity 10 (60 h), \(\sim\)80% at salinity 15 (72 h), and \(\sim\)100% at salinity 20 (84 h); (ii) during the 2 nd cycle (salinity decrease/maintenance), burrowing percentage followed a similar pattern, decreasing to 75% at salinity 10 (108 h), \(\sim\)30% at salinity 5 (120 h), ultimately reaching 3% after 144 h. At the end, almost all individuals were at the surface and the registered mortality was \(\sim\)3%. Treatment B: (i) during the 1 st salinity variation cycle, the percentage of buried individuals was \(\sim\)100% at salinity 20 (12 h) and 15 (24 h), (Table 2, Figure 3 B), decreasing when salinity was reduced to 60% at salinity 10 (36 h) and \(\sim\)10% at salinity 5 (48 h), and it increased again when salinity rose, reaching \(\sim\)40% at salinity 10 (60 h), \(\sim\)90% at salinity 15 (72 h) and \(\sim\)100% at salinity 20 (84 h); (ii) on the 2 nd cycle, a similar burrowing pattern was observed, decreasing with salinity reduction to \(\sim\)75% buried at salinity 10 (108 h) and \(<\)40% at salinity 5 (120 h), and increased when salinity rose, reaching \(\sim\)60% at salinity 10 (132 h) and \(\sim\)90% after 144 h. At the end of the test \(<\)10% individuals were at the surface and mortality was \(\sim\)3%.