Effects of increased seawater pCO2 on early development of the oyster Crassostrea gigas
Effects of increased seawater pCO2 on early development of the oyster Crassostrea gigas
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DOI：
10.3354/ab00009
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发表时间：
2007-01-01
期刊：
影响因子：
1.4
通讯作者：
Ishimatsu, Atsushi
中科院分区：
文献类型：
--
作者：
Kurihara, Haruko;Kato, Shoji;Ishimatsu, Atsushi
这项研究表明，预计到2300年，海水中二氧化碳分压（pCO（2））的增加和随之而来的酸化将严重影响牡蛎的早期发育。将牡蛎卵人工受精并在酸化至pH 7.4的海水（CO2组）中培养48 h，并与对照组（空气平衡海水）的幼体形态和壳矿化度进行比较。只有5%的CO2组发展成正常的“D形”面盘幼虫相比，在对照组的68%，虽然没有观察到组之间的担轮幼虫阶段的差异。因此，在胚胎发生过程中，钙化过程似乎特别受到低pH值和/或高CO2海水的低CaCO 3饱和状态的影响。具有完全矿化壳的面盘幼虫占CO2组幼虫的30%，而对照组为72%（p < 0.005）。45%的CO2组幼虫的壳矿化被完全抑制，而对照组仅为16%（p < 0.05）。对照组的正常D形面盘幼虫在受精后24 ~ 48 h壳长和壳高均有所增加，而CO2组的少数D形面盘幼虫在同一时期壳长和壳高均无增加。我们的研究结果表明，未来的海洋酸化将对海洋底栖钙化生物的早期发展产生有害影响。
This study demonstrated that the increased partial pressure Of CO2 (pCO(2)) in seawater and the attendant: acidification that are projected to occur by the year 2300 will severely impact the early development of the oyster Crassostrea gigas. Eggs of the oyster were artificially fertilized and incubated for 48 h in seawater acidified to pH 7.4 by equilibrating it with CO2-enriched air (CO2 group), and the larval morphology and degree of shell mineralization were compared with the control treatment (air-equilibrated seawater). Only 5% Of the CO2 group developed into normal 'D-shaped' veliger larvae as compared with 68% in the control group, although no difference was observed between the groups up to the trochophore stage. Thus, during embryogenesis, the calcification process appears to be particularly affected by low pH and/or the low CaCO3 saturation state of high-CO2 seawater. Veliger larvae with fully mineralized shells accounted for 30% of the CO2-group larvae, compared with 72 % in the control (p < 0.005). Shell mineralization was completely inhibited in 45 % of the CO2-group larvae, but only in 16 % of the control (p < 0.05). Normal D-shaped veligers of the control group exhibited increased shell length and height between 24 and 48h after fertilization, while the few D-shaped veligers of the CO2 group showed no shell growth during the same period. Our results suggest that future ocean acidification will have deleterious impacts on the early development of marine benthic calcifying organisms.