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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effect of reduced pH on shells of brooded veligers in the estuarine bivalve Ostrea chilensis Philippi 1845
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Effect of reduced pH on shells of brooded veligers in the estuarine bivalve Ostrea chilensis Philippi 1845

机译：pH值降低对河口双壳动物Ostrea chilensis Philippi 1845中育雏壳的影响

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摘要

The oyster Ostrea chilensis develops in estuaries and incubates its embryos inside the pallial cavity. Reduced external salinity triggers valve closure and isolation of the brood chamber, which in turn alters conditions in the pallial fluid, including pH reductions ranging from 7.65 (SD = 0.05) to 6.97 (SD = 0.02) in non-brooding females and 6.96 (SD = 0.10) in brooding females after 12 h of isolation. Exposing veliger larvae to acidic pH's (5 and 3) decreased the thickness of the embryonic shell valves. Calcium, sodium, chlorine, tin, sulphur, and magnesium were the most important (>99%) elements constituting the veliger shells. Calcium content in the pallial cavity fluid increased with continued isolation in both brooding and non-brooding females, but calcium remained as the primary component (about 94%) of embryonic shells and maintained its normal proportion with respect to the rest of the elements at all tested pH's. The increased calcium in the pallial fluid was identified mainly as coming from the shells of brooding females. If any neutralizing elements were coming from embryonic shell valves, all elements in those shells must have been solubilising to the same degree. Veligers ceased all further shell growth while isolated within the female's brood chamber. However, veliger shell growth resumed once females were returned to high-salinity seawater. Our study shows that female isolation of the mantle cavity, often considered an adaptive response to the periodically reduced salinities of estuarine waters, can in fact generate adverse effects on brooded embryos.
机译：牡蛎Ostrea chilensis在河口发育，并在卵囊腔内孵化其胚胎。外部盐度的降低会触发阀门关闭和孵化室的隔离，进而改变鸡眼液的状况，包括pH值降低，非育雏雌性从7.65（SD = 0.05）降低到6.97（SD = 0.02），而6.96（SD）隔离12小时后，在育雏雌性中= = 0.10）。将初生幼虫暴露于酸性pH（5和3）会降低胚壳瓣的厚度。钙，钠，氯，锡，硫和镁是构成松果壳的最重要元素（> 99％）。在育雏和非育雏雌性中，随着持续隔离，腹腔液中的钙含量增加，但是钙仍然是胚壳的主要成分（约94％），并且相对于其余所有元素保持其正常比例测试的pH值。腹腔积液中钙的增加主要是由于雌鸟的卵壳引起的。如果有任何中和元素来自胚壳瓣膜，那么这些壳中的所有元素必须已经溶解到相同程度。当被隔离在雌性的巢腔内时，Veliger停止了所有进一步的壳生长。然而，一旦雌性回到高盐度海水中，则必须重新开始生长雌性果壳。我们的研究表明，通常认为对河口水盐度周期性降低的适应性反应的雌性地幔腔隔离实际上会对育雏产生不利影响。

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