摘要
泥炭沼泽中的有壳阿米巴(testate amoebae)组合主要受水文变化的影响,由于环境指示意义明确常在泥炭古环境研究中作为古水文状况的代用指标。介绍了一种发现于哈尼泥炭地表层样品的有壳阿米巴虫小匣三角嘴虫(Trigonopyxis arcula)壳体。更为重要的是它所指示的环境意义与世界其他地区的研究结果一致。这表明利用有壳阿米巴进行本区泥炭地古环境重建具有巨大潜力。
Testate amoebae are a group of protists livings in peatlands, wet soil and freshwater lake. They are covered with tests （shells）. This decay - resistant shell can be preserved for millennia and allows species - level identification long after death. Currently testate amoebae are very useful environmental indicators in ecological and palaeoecological studies from peatlands . Their advantages are as follows： （1） mental significance. The assemblage of testate amoebae in peatlands not only in ombrotrophic bogs but also in minerotrophic fens. Their They have the clearly environ- is mainly controlled by hydrological variation defined ecological niches make it easy to interpret the result of paleoenvironmental reconstruction. （2）Because of their endurable tests the relative abundance of testate amoebae can keep steady during the process of fossilization. This allows direct comparison between modem and fossil communities. （3） The reproduction of testate amoebae is a relatively fast process and this should make them temporally sensitive indicators of paleoenvironmental changes. Because of these advantages testate amoebae draw more and more attention of scientists in paleoenvironmental studies. Trigonopyxis arcula is one of common taxa in peatlands. It is often found on the top of hummock where the depth to water is low. Therefore lands. Hani mire（42°13′7″N,126°30′7″E） has the deepest peat deposition （9.6 m） in Northeast China and is an ideal site for paleoenvironmental reconstruction. Much work has been done based on the peat sampled from here.
Trigonopyxis arcula discovered in Hani mire was presented in this paper. The samples were collected in June, 2007. The preparation method is water - based sieving techniques following Charman. The test found here is 115 -133 μm in diameter, pale yellowish brown, circular in dorsal view, hemispherical in lateral view. The shell is composed of mineral particles bounded by organic cement. The aperture is central, typical trianglar, 20 - 30 μm in diameter, invaginated and surrounded by a collar of organic cement. This test is also discovered on the top of a hummock of Sphagnum nemoreum where the depth to watertable is about 45 cm, which means a dry condition.
This is the first report of discovering the testate amoebae in sphagnum bog in China. More significantly, this consistent agreeing with other Studies of peatlands worldwide indicates a great potentiality of testate amoebae used as a proxy for paleohydrology in peat - based paleoenvironmental reconstruction in China. Peatlands are widely distributed in Northeast China and peat deposits are always the important archives of regional environmental changes. It is believed that in the future testate amoebae will be a significant proxy in paleoenvironmenta studied in Northeast China.
出处
《湿地科学》
CSCD
2008年第1期75-79,共5页
Wetland Science
基金
国家自然科学青年基金项目(30700055)
东北师范大学青年科学基金项目(20050501)资助
关键词
小匣三角嘴虫
有壳阿米巴
哈尼泥炭地
古环境重建
Trigonopyxis arcula
testate amoebae
Hani Mire
Paleoenvironmental reconstruction
