Abstract
At reduced salinities, brooding females of some gastropods and bivalves may isolate their mantle cavities from the environment for several days, maintaining internal osmotic concentration but causing severe declines in dissolved oxygen and pH, and increases in ammonia and other toxic substances in the mantle fluid. This study in November–December examined the immediate consequences of such stresses for brooded embryos of Quempillén estuary gastropod Crepipatella dilatata, in terms of time to juvenile emergence and rates of embryonic growth [measured as shell length (SL)]. Juveniles were also monitored for latent effects on feeding rates, oxygen consumption, and growth for the first 4 weeks after emergence into normal salinity seawater. An acute salinity stress lasting 3 days applied to females that were brooding pre-shelled or intermediate-shelled stages increased embryonic incubation periods, but without affecting SL at emergence. Growth rates were reduced for encapsulated embryos regardless of the stage at which the salinity stress was applied. Latent effects on juvenile development included slower shell growth and reduced rates of oxygen consumption and feeding. These effects were sustained for the first month after release from the female. The results suggest that marked reductions in salinity lasting for several days indirectly but negatively affect the development of brooded embryos of C. dilatata and also affect the juveniles for at least several weeks following their release, even after salinity has returned to normal.
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Acknowledgments
All experiments were conducted at Calfuco Coastal Laboratory and the Quempillén Estuarine Station, and we thank all at those laboratories who assisted in this work. The research was funded by Fondecyt (Fondo Nacional de Investigación Científica y Tecnológica—Chile) Grant No. 1100335.
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Communicated by J. Grassle.
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Chaparro, O.R., Segura, C.J., Osores, S.J.A. et al. Consequences of maternal isolation from salinity stress for brooded embryos and future juveniles in the estuarine direct-developing gastropod Crepipatella dilatata . Mar Biol 161, 619–629 (2014). https://doi.org/10.1007/s00227-013-2364-8
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DOI: https://doi.org/10.1007/s00227-013-2364-8