Effects of flocculated humic matter on free and attached pelagic microorganisms
Effects of flocculated humic matter on free and attached pelagic microorganisms
复制标题
絮凝腐殖质对游离和附着的浮游微生物的影响
DOI：
10.4319/lo.1989.34.4.0688
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发表时间：
1989
影响因子：
4.5
通讯作者：
J. Sieburth
中科院分区：
文献类型：
--
作者：
L. Tranvik;J. Sieburth
在实验室条件下研究了溶解态和颗粒态腐殖物质对浮游微生物的影响。将腐殖酸浓缩物以溶解或部分絮凝的形式添加到天然细菌种群的培养物中。由于附着在颗粒上的表观细菌的发生，当一部分添加的碳絮凝时，获得了显著更高的细菌产率。附着的细菌显然利用絮凝物以及颗粒周围的溶解有机碳。自由和附着的细菌都被噬菌体鞭毛虫吃过。除了吃附着的细菌外，附着的鞭毛虫还可以摄取游离的细菌。在11个贫营养湖泊，从那些清澈的水到那些严重着色与腐殖物质，线性增加量的颗粒物质和颗粒相关的附着细菌被发现在浮游物中的腐殖物质含量的增加。我们认为，悬浮碎屑颗粒（腐殖絮凝物）有一个积极的影响，由于富集的异养表观细菌-食菌鞭毛虫段的微生物食物网的腐殖湖泊的次级生产力。
The effect of dissolved and particulate humic matter on pelagic microorganisms was studied in laboratory experiments. A humic concentrate was added to cultures of natural bacterial populations in either dissolved or partly flocculated form. Due to the occurrence of epibacteria attached to particles, a markedly higher bacterial yield was obtained when a fraction of the added carbon was flocculated. Attached bacteria apparently utilized floes as well as dissolved organic carbon surrounding the particles. Both free and attached bacteria were grazed by phagotrophic flagellates. In addition to grazing attached bacteria, attached flagellates could ingest free bacteria. In 11 oligotrophic lakes, ranging from those with clear water to those heavily colored with humic substances, a linearly increasing amount of both particulate material and particle-associated epibacteria was found in the pelagial with increasing humic content. We suggest that suspended detritus particles (humic flocculates) have a positive influence on the secondary productivity of humic lakes due to an enrichment of the heterotrophic epibacterial-bacterivorous flagellate segment of the microbial food web.