. Le bulletin biologique. Biologie ; zoologie ; biologie ; biologie marine. 346 H A. WOODS ET R. L. DF.SILETS. JR. Le tableau III 30 Morphologie d'Melanochlamys diomedea aux masses d'oeufs (n  = 31 ) Gamme SEM Moyenne £ 20 '5 Longueur (cm) (cm) Volume (ml) 2,25 2,96 0,76 0,32 0,18 0,28 1,5 à 0,8 2,3 à 1,6 0.35-1.30 La masse (g) 0,75 0,29 0.34-1.32 10 Facteur 5 ANOVA sur les données transformées en biais : F  = 37,9, P &Lt ; 0,0001 et F  = 40,6, P &Lt ; 0,0001. respectivement). Tous les embryons ont survécu au traitement témoin. La réponse à l'âge touchés et progressive des traitements brutaux. Larves (pointillés) survivent mieux vo

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 H A. WOODS AND R. L. DF.SILETS. JR. Table III 30 Morphology of Melanochlamys diomedea egg masses (n = 31 ) Mean SEM Range £ 20 '5 Length (cm) Circumference (cm) Volume (ml) 2.25 2.96 0.76 0.32 0.18 0.28 1.5-3.8 2.3-3.6 0.35-1.30 Mass (g) 0.75 0.29 0.34-1.32 10 5 factor ANOVA on angularly transformed data: F = 37.9, P < 0.0001 and F = 40.6, P < 0.0001. 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 = 0.80) better than the abrupt change (0.30). The younger, pre-kidney-spot, embryos did not survive well under either the gradual (0.07) or abrupt (0.01) 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 = 0.3 cm) of a spherical egg mass (a = 0.566 cm). The dashed lines indicate the trajectories at this same position (r = 0.3 cm) in a mass 25% larger (a = 0.609 cm) or smaller (a = 0.514 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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• bookauthorlilliefrankrat
• booksubjectbiology
• booksubjectzoology