Abdullah Al Mamun, Gao Yangyang, Xu Guangjian, Wang Zheng, Warren Alan, Xu Henglong
Laboratory of Microbial Ecology, Ocean University of China, China.
Department of Life Sciences, Natural History Museum, London SW7 5BD, UK.
Eur J Protistol. 2018 Apr;63:34-43. doi: 10.1016/j.ejop.2018.01.003. Epub 2018 Jan 31.
Vertical variations in trophic-functional patterns of biofilm-dwelling ciliates were studied in coastal waters of the Yellow Sea, northern China. A total of 50 species were identified and assigned to four trophic-functional groups (TFgrs): algivores (A), bacterivorous (B), non-selective (N) and raptors (R). The trophic-functional structures of the ciliate communities showed significant variability among different water depths: (1) with increasing water depth, relative species numbers and relative abundances of groups A and R decreased sharply whereas those of groups B and N increased gradually; (2) in terms of the frequency of occurrences, group A dominated at depths of 1-3.5 m whereas group B dominated at 5 m, while in terms of the probability density function of the trophic-functional spectrum, group A was the highest contributor at 1 m and group B was highest at the other three depths; (3) distance-based redundancy analyses revealed significant differences in trophic-functional patterns among the four depths, except between 2 and 3.5 m (P > 0.05); and (4) the trophic-functional trait diversity increased from 1 to 3.5 m and decreased sharply at 5 m. Our results suggest that the biofilm-dwelling ciliates maintain a stable trophic-functional pattern and high biodiversity at depths of 1-3.5 m.
在中国北方黄海近岸水域，研究了附着于生物膜的纤毛虫营养功能模式的垂直变化。共鉴定出50个物种，并将其分为四个营养功能组（TFgrs）：食藻者（A）、食细菌者（B）、非选择性者（N）和捕食者（R）。纤毛虫群落的营养功能结构在不同水深之间表现出显著差异：（1）随着水深增加，A组和R组的相对物种数量和相对丰度急剧下降，而B组和N组的则逐渐增加；（2）就出现频率而言，A组在1-3.5米深度占主导，而B组在5米深度占主导，而就营养功能谱的概率密度函数而言，A组在1米时贡献最高，而B组在其他三个深度时最高；（3）基于距离的冗余分析显示，除了2米和3.5米之间（P> 0.05），四个深度之间的营养功能模式存在显著差异；（4）营养功能性状多样性从1米到3.5米增加，并在5米时急剧下降。我们的结果表明，附着于生物膜的纤毛虫在1-3.5米深度维持稳定的营养功能模式和高生物多样性。
