(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.


Figure 4


Fig. 4. The mean (±s.e.m.) number of pneumostome openings (A), total breathing time (B) and mean breathing time (C) of snails in each of the three water treatments. (A) Number of pneumostome openings in PW (2.32±0.29) compared with that in CE (3.58±0.35) and BC (2.52±0.30). The number for CE is significantly higher (**P<0.01, N=65) than that for either PW or BC, which were not significantly different from each other (one-way ANOVA). (B) The total breathing time in PW (72.5±9.84 s), CE (109.8±12.29 s) and BC (69.20±10.01 s; N=65). Again, CE results were significantly higher (**P<0.01, N=65) than those for either PW or BC, which were not significantly different from each other (one-way ANOVA). (C) The mean breathing time was not significantly different in any of the groups.