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

首页> 外文期刊>Marine Biology: International Journal on Life in Oceans and Coastal Waters >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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Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (Gastropoda: Muricidae)

机译：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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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 ℃ to 18 ℃ 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 ℃ than at 15 ℃ or 18 ℃. 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 IPO_2 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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《Marine Biology: International Journal on Life in Oceans and Coastal Waters》 |2003年第1期|133-139|共7页
作者
J. Cancino; J. A. Gallardo; F. A. Torres;
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作者单位

Departamento de Ecologia Costera, Facultad de Ciencias, Universidad Catolica de la Santisima Concepcion, Casilla 297, Concepcion, Chile;

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正文语种英语
中图分类环境生物学;
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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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