. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 H A. WOODS AND R. L. JR. Table III 30 Morphology of Melanochlamys diomedea egg masses (n = 31 ) Mean SEM Range £ 20 '5 Length (cm) Circumference (cm) Volume (ml) Mass (g) 10 5 factor ANOVA on angularly transformed data: F = , P < and F = , P < respectively). All embryos survived the control treatment well. Age affected the response to gradual and abrupt treatments. Veligers (dashed lines) survived better ov
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 H A. WOODS AND R. L. JR. Table III 30 Morphology of Melanochlamys diomedea egg masses (n = 31 ) Mean SEM Range £ 20 '5 Length (cm) Circumference (cm) Volume (ml) Mass (g) 10 5 factor ANOVA on angularly transformed data: F = , P < and F = , P < respectively). All embryos survived the control treatment well. Age affected the response to gradual and abrupt treatments. Veligers (dashed lines) survived better overall and also survived the gradual change (mean = ) better than the abrupt change (). The younger, pre-kidney-spot, embryos did not survive well under either the gradual () or abrupt () conditions of change. We note that, because individuals in different treatments were not completely independent (capsules within a mass were split into groups). ANOVA is not an entirely appropriate statistical test; however, no better test is available. Discussion Our observations demonstrate that gelatinous egg masses can protect embryos from salinity changes (Fig. 1). Although isolated embryos survived 3-h exposures to a wide range of salinities (10- 30%o), gel markedly improved survival at the lowest salinities (0, 5%c). Gelatinous masses Mean volume +25% - 25% Hours Figure 4. Model predictions of salinity change in egg masses of Melantichlinny\ ilimtu'ilea as a function of time at a position about halfway between the center and the edge (r = cm) of a spherical egg mass (a = cm). The dashed lines indicate the trajectories at this same position (r = cm) in a mass 25% larger (a = cm) or smaller (a = cm). have not been previously examined for this protective abil- ity, with the exception of the egg masses of a polychaete, Scoloplos armiger (Gibbs. 1968). The results parallel those presented here. Polychaete larvae within intact masses and those removed
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