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

被引：39

作者：

Cancino, JM ^{[1
]}

Gallardo, JA ^{[1
]}

Torres, FA ^{[1
]}

机构：

[1] Univ Catolica Santisima Concepcion, Fac Ciencias, Dept Ecol Costera, Concepcion, Chile

来源：

MARINE BIOLOGY | 2003年 / 142卷 / 01期

关键词：

D O I：

10.1007/s00227-002-0925-3

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

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 12degreesC to 18degreesC 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 12degreesC than at 15degreesC or 18degreesC. The embryonic inability to produce a shell under hypoxia is likely to be a result of the low intracapsular oxygen concentration (IPO(2)) 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.

引用

页码：133 / 139

页数：7

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