Figure 1.
Crepipatella peruviana: Effects of reduced environmental salinity on isolation of the female pallial cavity.
Each point represents means and SD (total n = 60, with 10 replicates per salinity value).
Figure 2.
Crepipatella peruviana: Ability of adult females to maintain elevated salinity in the pallial cavity under conditions of low external salinity.
Salinity was reduced from 32 to 15 at hour 2, as indicated. Each point represents the mean and SD (total n = 60, with 10 replicates for each time point).
Figure 3.
Crepipatella peruviana: The influence of salinity discontinuities on the vertical distribution of veliger larvae in a vertical water column.
a: Control treatment: continuous salinity throughout at 32. b: discontinuous salinities of 32 in the lower half and 25 in the upper half of the column. c: discontinuous salinities of 32 and 20. d: discontinuous salinities of 32 and 15. The area between both horizontal dashed lines indicates the mixing zone or discontinuity between the two salinities. Each bar represents the means and SD of 6 replicates (n total = 24 columns and 100 veligers per columns).
Table 1.
Results of a Two-way ANOVA performed on data from the experiment measuring the vertical distributions of C. peruviana veligers in environments of discontinuous salinity (32/32 (control), 32/25, 32/20, 32/15).
Figure 4.
Crepipatella peruviana: Effect of low salinity on veliger mortality (LC50).
Each bar represents means and SD (total n = 3 replicates per treatments, with 100 veligers per replicate). Different letters above the bars indicate significant differences (p<0.05).
Figure 5.
Crepipatella peruviana: Effect of low salinity on velar activity expressed as the percentage of veligers with extended velar lobes.
Each bar represents the mean activity+one SD (total n = 4 replicates per treatments, with 50 veligers per replicate). Different letters above the bars indicate significant differences among means (p<0.05).
Figure 6.
Crepipatella peruviana: Effect of reduced salinity on velar surface area.
Each bar represents the means and SD (total n = 4 replicates per treatments, with 50 veligers per replicate). Different letters above the bars indicate significant differences (p<0.05).
Figure 7.
Crepipatella peruviana: Effect of ambient salinity on larval swimming velocity measured as the distance displaced by the veligers in a specified time.
* Indicates absence of displacement. Each bar represents means and SD (total n = 4 replicates per treatment, with 10 veligers per replicate). Different letters above the bars indicate significant differences between means (p<0.05).
Figure 8.
Crepipatella peruviana: Influence of reduced salinity on rates of oxygen consumption by young veligers.
Each bar represents means and SD (total n = 6 replicates per treatments, with 50 veligers per replicate). Different letters above the bars indicate significant differences among means (p<0.05).
Figure 9.
Crepipatella peruviana: Effect of salinity exposition on clearance rate of early veligers.
Each bar represents means and SD (total n = 6 replicates per treatments, with 10 veligers per replicate). Different letters above the bars indicate significant differences (p<0.05).