Comparison of anaerobic and aerobic biodegradation of mineralized skeletal structures in marine and estuarine conditions
Comparison of anaerobic and aerobic biodegradation of mineralized skeletal structures in marine and estuarine conditions
复制标题
海洋和河口条件下矿化骨骼结构厌氧和需氧生物降解的比较
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
F. Mackenzie
中科院分区：
文献类型：
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作者：
A. Simon;M. Poulicek;B. Velimirov;F. Mackenzie
生物降解速率的知识是必不可少的水系统的地球化学和生态学的研究。它有助于我们量化化学成分的产生和吸收速率及其再循环，并了解沉积物中有机质积累的机制和速率。在科西嘉岛卡尔维湾的浅海沃茨和布列塔尼罗斯科夫的河口沃茨中对六种矿化骨骼的生物降解过程进行了实验研究。三种类型的软体动物壳，海胆骨骼板，螃蟹角质层和鱼脊椎骨暴露于氧化和缺氧条件下超过15天至30个月。回收后的基板，蛋白质测定，细菌计数和有机碳analysis.Quantitative蛋白质测定和细菌计数表明，矿化骨骼结构的生物降解发生在缺氧条件下比在好氧条件下的速度较慢。细菌分析表明，在缺氧环境中，不到0.5%的消耗的有机物转化为细菌生物量。骨架的好氧生物降解速率与有机质含量呈正相关，河口沉积物中骨架的好氧生物降解速率远低于浅海沉积物。保存在河口条件下的骨架结构似乎与溶解有机物的丰度，而不是与高沉积速率。
The knowledge of the biodegradation rates is essential to studies of the biogeochemistry and ecology of aquatic systems. It helps us to quantify the production and uptake rates of chemical components and their recycling, and to understand the mechanisms and rates of organic matter accumulation in sediments. Experimental studies of biodegradation processes in six types of mineralized skeletons were performed in shallow-marine waters of Calvi Bay, Corsica and in estuarine waters of Roscoff, Brittany. Three types of mollusk shells, sea urchin skeletal plates, crab cuticle and fish vertebrae were exposed to oxic and anoxic conditions over periods of 15 days to 30 months. After recovery of the substrates, protein assays, bacterial counts and organic carbon analyses were performed.Quantitative protein assays and bacterial counts indicate that biodegradation of mineralized skeletal structures occurs at a slower rate in anoxic conditions than in oxic conditions. Bacterial analysis showed that in anoxic environment, less than 0.5% of the consumed organic matter is converted into bacterial biomass. The aerobic biodegradation rate was positively correlated with the organic content of the skeletons.Anoxic biodegradation of skeletons occurred at much slower rates in estuarine sediments than in shallow marine sediments. Preservation of skeletal structures in estuarine conditions appears to be correlated with the abundance of dissolved organic matter rather than with high sedimentation rates.