SEASONAL DEVELOPMENT OF HYPOLIMNETIC CILIATE COMMUNITIES IN A EUTROPHIC POND
SEASONAL DEVELOPMENT OF HYPOLIMNETIC CILIATE COMMUNITIES IN A EUTROPHIC POND
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DOI：
10.1016/0168-6496(94)90113-9
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发表时间：
1994-09-01
影响因子：
4.2
通讯作者：
SCHINK, B
中科院分区：
文献类型：
--
作者：
GUHL, BE;FINLAY, BJ;SCHINK, B
对一个高产池塘浅水层纤毛虫原生动物群落进行了两年的调查。三个生理群体可以区分：（a）微好氧纤毛虫跟踪内的分层水柱的缺氧-缺氧边界;（B）厌氧纤毛虫与内共生产甲烷菌;和（c）厌氧菌没有内共生产甲烷菌。两组厌氧菌均局限于低层的缺氧区。群落生物量占主导地位的微好氧纤毛虫，平均20倍大的细胞比厌氧纤毛虫。夏季微好氧纤毛虫的丰度和生物量下降，而厌氧纤毛虫的丰度和生物量增加。这反映了无机营养物质的可用性的空间转移，因此，纤毛虫的食物从表和metallamnion的hypolimnion。厌氧纤毛虫的低生物量生产与厌氧代谢的低理论生长效率相一致。纤毛虫物种显示特征的空间和季节分布格局内的水柱，这是在这两年调查相似。时空分布主要受两个因素控制：（1）溶解氧的分布;（2）食物的可获得性。分布格局与氧梯度以外的化学梯度无关，但与主要食物来源的分布有关。
The ciliated protozoan communities in the hypolimnion of a highly productive pond were investigated over two years. Three physiological groups could be distinguished: (a) microaerobic ciliates which tracked the oxic-anoxic boundary within the stratified water column; (b) anaerobic ciliates with endosymbiotic methanogens; and (c) anaerobes without endosymbiotic methanogens. Both groups of anaerobes were confined to the anoxic zone of the hypolimnion. Community biomass was dominated by microaerobic ciliates which had on average 20 times larger cells than anaerobic ciliates. Abundance and biomass of microaerobic ciliates decreased over the summer, while anaerobic ciliates increased. This reflected a spatial shift in the availability of inorganic nutrients and, as a result, of ciliate food from the epi- and metalimnion to the hypolimnion. The low biomass production of anaerobic ciliates was consistent with the low theoretical growth efficiency of anaerobic metabolism. Ciliate species displayed characteristic spatial and seasonal distribution patterns within the water column which were similar in both years investigated. Spatial and temporal distribution was mainly governed by two factors: (1) the distribution of dissolved oxygen; and (2) the availability of food. Distribution patterns were not related to chemical gradients other than the oxygen gradient, but they were correlated with the distribution of major food sources.