Microbial decomposition of proteins and lipids in copepod versus rotifer carcasses
Microbial decomposition of proteins and lipids in copepod versus rotifer carcasses
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DOI：
10.1007/s00227-010-1434-4
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发表时间：
2010-07-01
期刊：
影响因子：
2.4
通讯作者：
Tang, Kam W.
中科院分区：
文献类型：
--
作者：
Bickel, Samantha L.;Tang, Kam W.
浮游动物尸体在水生系统中很常见，可能是细菌的有机物丰富的基质。我们比较了微生物分解的代表甲壳类（桡足类）和非甲壳类（轮虫）浮游动物尸体和监测尸体蛋白质和脂质含量的变化。我们的研究结果表明，尸体的分解主要是由细菌从周围的水定殖驱动。尸体相关的细菌表现出较高的蛋白酶和脂肪酶活性比自由生活的细菌。桡足类尸体的蛋白质含量下降了70%，在第一个8小时内，从大到小尺寸的蛋白质，而蛋白质损失的轮虫尸体是微不足道的。在24小时内，无论是浮游动物类型，虽然极性支链脂肪酸增加桡足类动物的尸体，表明在可行的微生物生物量的增加，尸体的脂质含量没有显着变化。我们的研究结果表明，不同的营业额的蛋白质与脂质内的浮游动物尸体和尸体从不同的浮游动物群体会影响水柱微生物的过程不同。
Zooplankton carcasses are common within aquatic systems and potentially serve as organic-rich substrates for bacteria. We compared the microbial decomposition of representative crustacean (copepod) and non-crustacean (rotifer) zooplankton carcasses and monitored changes in carcass protein and lipid contents. Our results showed that carcass decomposition was mainly driven by bacteria colonizing from the surrounding water. Carcass-associated bacteria displayed higher protease and lipase activities than free-living bacteria. Protein content of copepod carcasses decreased by 70% within the first 8 h and shifted from larger to smaller sized proteins, while protein loss in rotifer carcasses was insignificant. Carcass lipid content did not change significantly over 24 h in either zooplankton type, although polar branched fatty acids increased on copepod carcasses indicating an increase in viable microbial biomass. Our results suggest differential turnover of protein versus lipid within a zooplankton carcass and that carcasses from different zooplankton groups would affect water column microbial processes differently.