Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (gastropoda: Muricidae)

J. M. Cancino; J. A. Gallardo; F. A. Torres

doi:10.1007/s00227-002-0925-3

Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (gastropoda: Muricidae)

J. M. Cancino, J. A. Gallardo, F. A. Torres

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12°C to 18°C reduced by 15 days the median time required for the capsules to hatch. Hypoxia (oxygen content at 50% of air saturation) generated a low development rate and totally prevented both shell secretion and larval hatching from the egg capsule. Experimental transfer at weekly intervals, from normoxia to hypoxia and vice versa, induced a decrease and increase in the embryonic ash content, respectively, but did not affect the number of hatched larvae. Such an effect was more pronounced at 12°C than at 15°C or 18°C. The embryonic inability to produce a shell under hypoxia is likely to be a result of the low intracapsular oxygen concentration (IPO₂) generated as the combined effect of a low extracapsular oxygen concentration (environmental) added to the intracapsular embryonic oxygen demands, which lowers the IPO₂ still further. Under such conditions, a decrease in intracapsular pH is likely to take place, and, if so, embryos might divert carbonates away from shell calcification to balance such changes in pH.

Original language	English
Pages (from-to)	133-139
Number of pages	7
Journal	Marine Biology
Volume	142
Issue number	1
DOIs	https://doi.org/10.1007/s00227-002-0925-3
State	Published - 1 Jan 2003
Externally published	Yes

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10.1007/s00227-002-0925-3

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title = "Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (gastropoda: Muricidae)",

abstract = "The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12°C to 18°C reduced by 15 days the median time required for the capsules to hatch. Hypoxia (oxygen content at 50% of air saturation) generated a low development rate and totally prevented both shell secretion and larval hatching from the egg capsule. Experimental transfer at weekly intervals, from normoxia to hypoxia and vice versa, induced a decrease and increase in the embryonic ash content, respectively, but did not affect the number of hatched larvae. Such an effect was more pronounced at 12°C than at 15°C or 18°C. The embryonic inability to produce a shell under hypoxia is likely to be a result of the low intracapsular oxygen concentration (IPO2) generated as the combined effect of a low extracapsular oxygen concentration (environmental) added to the intracapsular embryonic oxygen demands, which lowers the IPO2 still further. Under such conditions, a decrease in intracapsular pH is likely to take place, and, if so, embryos might divert carbonates away from shell calcification to balance such changes in pH.",

author = "Cancino, {J. M.} and Gallardo, {J. A.} and Torres, {F. A.}",

note = "Funding Information: Acknowledgements We gratefully acknowledge the financial support by the {\textquoteleft}{\textquoteleft}Programa Acuicultura y Biotecnolog{\'i}a Marina, 1(97), FONDAP, Chile, Subprograma Invertebrados{\textquoteright}{\textquoteright}, which made this investigation possible, and especially to Dr. J.C. Castilla, director of the program at the time the investigation was carried out. We are also grateful to Dr. C. Gallardo from Universidad Austral de Chile, Valdivia, for providing us with the ovicapsules of Chorus giganteus obtained at Metri in October 1997, to Dr. S. Mudge (University of Wales, Bangor, UK) for correcting our English and to A. Na-varrete for help with data processing. We are also grateful to six anonymous referees for their contributions toward improving the manuscript. The experiments carried out in the present study comply with current Chilean laws.",

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T1 - Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (gastropoda: Muricidae)

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AU - Gallardo, J. A.

AU - Torres, F. A.

N1 - Funding Information: Acknowledgements We gratefully acknowledge the financial support by the ‘‘Programa Acuicultura y Biotecnología Marina, 1(97), FONDAP, Chile, Subprograma Invertebrados’’, which made this investigation possible, and especially to Dr. J.C. Castilla, director of the program at the time the investigation was carried out. We are also grateful to Dr. C. Gallardo from Universidad Austral de Chile, Valdivia, for providing us with the ovicapsules of Chorus giganteus obtained at Metri in October 1997, to Dr. S. Mudge (University of Wales, Bangor, UK) for correcting our English and to A. Na-varrete for help with data processing. We are also grateful to six anonymous referees for their contributions toward improving the manuscript. The experiments carried out in the present study comply with current Chilean laws.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12°C to 18°C reduced by 15 days the median time required for the capsules to hatch. Hypoxia (oxygen content at 50% of air saturation) generated a low development rate and totally prevented both shell secretion and larval hatching from the egg capsule. Experimental transfer at weekly intervals, from normoxia to hypoxia and vice versa, induced a decrease and increase in the embryonic ash content, respectively, but did not affect the number of hatched larvae. Such an effect was more pronounced at 12°C than at 15°C or 18°C. The embryonic inability to produce a shell under hypoxia is likely to be a result of the low intracapsular oxygen concentration (IPO2) generated as the combined effect of a low extracapsular oxygen concentration (environmental) added to the intracapsular embryonic oxygen demands, which lowers the IPO2 still further. Under such conditions, a decrease in intracapsular pH is likely to take place, and, if so, embryos might divert carbonates away from shell calcification to balance such changes in pH.

AB - The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12°C to 18°C reduced by 15 days the median time required for the capsules to hatch. Hypoxia (oxygen content at 50% of air saturation) generated a low development rate and totally prevented both shell secretion and larval hatching from the egg capsule. Experimental transfer at weekly intervals, from normoxia to hypoxia and vice versa, induced a decrease and increase in the embryonic ash content, respectively, but did not affect the number of hatched larvae. Such an effect was more pronounced at 12°C than at 15°C or 18°C. The embryonic inability to produce a shell under hypoxia is likely to be a result of the low intracapsular oxygen concentration (IPO2) generated as the combined effect of a low extracapsular oxygen concentration (environmental) added to the intracapsular embryonic oxygen demands, which lowers the IPO2 still further. Under such conditions, a decrease in intracapsular pH is likely to take place, and, if so, embryos might divert carbonates away from shell calcification to balance such changes in pH.

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DO - 10.1007/s00227-002-0925-3

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JO - Marine Biology

JF - Marine Biology

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ER -

Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (gastropoda: Muricidae)

Abstract

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