Trophic coupling within the microbial food web: a study with fine temporal resolution in a eutrophic freshwater ecosystem
Trophic coupling within the microbial food web: a study with fine temporal resolution in a eutrophic freshwater ecosystem
复制标题
微生物食物网内的营养耦合：富营养化淡水生态系统中精细时间分辨率的研究
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
B. Finlay
中科院分区：
文献类型：
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作者：
U. Berninger;S. Wickham;B. Finlay
总结
1
在为期5个月的时间里，对Priest Pot（一个小型淡水池塘）的微生物食物网（溶解有机碳、细菌、原生动物、轮虫和藻类）的主要组成部分进行了调查。每隔1-3天从表层采集水样。
2
时间序列分析有助于确定的营养关系内的浮游生物群落。纤毛虫和大型轮虫与总的微型浮游生物之间，轮虫和小型纤毛虫之间，总的微型浮游动物群落和浮游植物之间有很强的捕食-被捕食关系。小型轮虫和小型纤毛虫可能共享相同的食物资源。用我们的方法不能鉴定系统中的主要噬菌体。然而，我们以前的研究结果指出，nano-tonic（2-20 μm）异养原生生物作为细菌的主要食草动物的主导作用。
3
轮虫是主要的后生浮游动物在牧师锅;甲壳类浮游动物是缺席的社会。细菌的生产可能通过多种途径到达轮虫：从细菌到食菌性微型浮游生物，到纤毛虫，然后到轮虫，可能有三个步骤的联系。此外，微型浮游生物和轮虫之间的强相关性表明这些成分之间存在直接联系，这意味着路径要短得多。池塘中的一些轮虫可以直接吃细菌，许多较大的浮游生物（大型纤毛虫和轮虫）是食藻动物。后两种捕食者与猎物的关系表明细菌和初级生产有效地转移到更高的营养水平。
SUMMARY
1
The major components of the microbial food web (dissolved organic carbon, bacteria, protozoa, rotifers and algae) of Priest Pot, a small freshwater pond, were investigated over a period of 5 months. Water samples were collected from the epilimnion every 1–3 days.
2
Time series analysis helped identify the trophic relationships within the planktonic community. There were strong predator—prey relationships between both ciliates and large rotifers and the total nanoplankton, between rotifers and small ciliates and between the total microzooplankton community and phytoplankton. Small rotifers and small ciliates probably share the same food resources. The major bacterivores in the system could not be identified with our methods. However, our previous results point to a dominating role of nanoplanktonic (2–20 μm) heterotrophic protists as the main grazers of bacteria.
3
Rotifers are the major type of metazoan zooplankton in Priest Pot; crustacean zooplankton are absent from the community. Bacterial production probably reaches rotifers via a variety of pathways: there may be a three-step link from bacteria to bacterivorous nanoplankton, to ciliates and then to rotifers. Furthermore, a strong correlation between the nanoplankton and rotifers suggests a direct link between these components, implying a much shorter pathway. Some of the rotifers in the pond can graze directly on bacteria, and many of the larger planktonic organisms (large ciliates and rotifers) are algivores. The latter two predator—prey relationships suggest an efficient transfer of bacterial and primary production to higher trophic levels.