Carbonate deposits in marine fish intestines: A new source of biomineralization
Carbonate deposits in marine fish intestines: A new source of biomineralization
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海洋鱼肠道中的碳酸盐沉积物：生物矿化的新来源
DOI：
10.4319/lo.1991.36.6.1227
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发表时间：
1991
影响因子：
4.5
通讯作者：
T. Mommsen
中科院分区：
文献类型：
--
作者：
P. Walsh;P. Blackwelder;K. A. Gill;E. Danulat;T. Mommsen
海洋硬骨鱼对海水的渗透性较低。作为多器官渗透调节策略的一部分，它们饮用海水并选择性地通过肠上皮吸收水分和矿物质。值得注意的是，二价阳离子（Ca2+和MgZ '）被留下了。我们在这里报道，在海湾蟾蜍鱼（Opsanus beta）中，肠道渗透调节的离子副产物有助于碳酸盐矿物的重新形成，初步确定为钙盐矿。我们的数据表明，肠道矿化是海洋硬骨鱼渗透调节的一个普遍特征，这一过程是海洋碳酸盐沉积物的一个尚未被认识的重要来源。摘要：通过实验验证了碱度异常技术在研究造礁生物钙化和光合作用速率方面的有效性。采用EGTA络合滴定法和总碱度酸滴定法两种不同的方法估算了在光照和黑暗条件下硬核珊瑚（Pocillopora dami-cornis， L.）整个群落的CaCO沉淀速率，并对除碳酸盐外的其他离子浓度的变化进行了校正和不校正。这两种技术提供了相同的光增强钙化和暗钙化估计，无论是否对总al进行校正。我们感谢RV Lady Bas- ten的船长和机组人员在现场的帮助，AIMS分析服务单位进行营养测定，以及D. J. Barnes， B. E. Chalker， J. K. Oliver和三位匿名者对手稿的批判性审查。这个碱度数据反映了营养物质浓度的变化。这些结果证实了碱度异常技术的假设是基本正确的，不需要对总碱度数据进行校正
-Marine teleostean fish are hypo-os- motic to seawater. As part of a multiorgan osmoregulatory strategy they drink seawater and selectively absorb water and minerals across the intestinal epithelium. Notably, divalent cations (Ca2+ and MgZ’) are left behind. We report here that in the gulf toadfish, Opsanus beta, the ionic by-products of osmoregulation in the intestine contribute to de novo formation of a carbonate mineral, tentatively identified as calcian kutnohorite. Our data suggest that intestinal mineral- ization is a general feature of osmoregulation in marine teleosts and that this process is an un- recognized and possibly substantial source of marine carbonate sediments. Abstract-Experiments were conducted to es- tablish the validity of the alkalinity anomaly technique for investigating rates of calcification and photosynthesis by coral reef-building organisms. Rates of CaCO, precipitation by whole col- onies of the scleractinian coral Pocillopora dami-cornis (L.) were estimated under light and dark conditions with two different methods: complex-ometric titration of Ca with EGTA and acid ti- tration of total alkalinity, with and without cor-rection for alterations in the concentrations of ions other than carbonate species. The two tech-niques provided equivalent estimates of light-en- hanced and dark calcification, irrespective of whether corrections were applied to the total al-Acknowledgments We thank the Master and crew of the RV Lady Bas- ten for assistance in the field, the AIMS Analytical Services Unit for performing the nutrient determina- tions and D. J. Barnes, B. E. Chalker, J. K. Oliver, and three anonymous for critical review of the manuscript. This kalinity data for changes in nutrient concentra- tion. These results confirm that the assumptions of the alkalinity anomaly technique are funda- mentally correct and that it is not necessary to correct total alkalinity data