. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SALINITY TOLERANCES OF LARVAL RAPANA 99. Figure 2. Average summer surface salinity in the Chesapeake Bay (modified from Stroup and Lynn, 1963: data in agreement with Rennie and Neilson. 1994). Shaded regions have salinities suitable for short-term survival of Rapana venosa veligers. Bottom type, availability of suitable prey, and residual circulation to effect larval dispersal support possible establishment within this same region. Results Mean percentage survival of Rapami venosa veligers ranged from at 15 d and 7 ppt
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SALINITY TOLERANCES OF LARVAL RAPANA 99. Figure 2. Average summer surface salinity in the Chesapeake Bay (modified from Stroup and Lynn, 1963: data in agreement with Rennie and Neilson. 1994). Shaded regions have salinities suitable for short-term survival of Rapana venosa veligers. Bottom type, availability of suitable prey, and residual circulation to effect larval dispersal support possible establishment within this same region. Results Mean percentage survival of Rapami venosa veligers ranged from at 15 d and 7 ppt to 100% at 27 d and 22 ppt (Table 1). Veliger age and salinity significantly affected the percentage survival (ANOVA. P < ; Table 2). There was a significant interaction between veliger age and salinity (ANOVA, P < ; Table 2). Veligers aged 15 and 17 d were significantly less tolerant of salinity changes than veligers of all other ages (ANOVA. P < ; Fisher's test. P < ). Veligers older than 25 d post- hatch had a significantly higher percentage survival than all other ages except 11 d and 21 d (ANOVA, P < ; Fisher's test, P < ). Veligers aged 21 d had a signif- icantly higher percentage survival than all younger veligers as well as those with an age of 23 d (ANOVA, P < ; Fisher's test, P < ). Eleven-day-old veligers were significantly more tolerant of salinity changes than were those at ages of 6, 9. 13, 19. or 23 d (ANOVA, P < ; Fisher's test, P < ). Percentage survival of R. venosa veligers was signifi- cantly less at 7 ppt than at any other salinity (ANOVA, P < ; Fisher's test, P < ). There were no differences in percentage survival at salinities greater than 16 ppt (ANOVA, P < ; Fisher's test, P < ). Percentage survival was significantly lower at 10 ppt than at salinities ranging from 16 to 32 ppt (ANOVA, P < ; Fisher's test, P < ). Percentage survival at
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
