Abundance of airborne heterotrophic protists in ground level air of South Dakota
Abundance of airborne heterotrophic protists in ground level air of South Dakota
复制标题
南达科他州地面空气中空气中异养原生生物的丰度
DOI：
10.1016/s0169-8095(98)00109-4
复制
发表时间：
1999
影响因子：
5.5
通讯作者：
A. Detwiler
中科院分区：
文献类型：
--
作者：
A. Rogerson;A. Detwiler
采用过滤采样器（采样速率约为16 l min - 1）测定了SD拉皮德城近对流层空气中异养原生生物（原生动物囊）的丰度，该采样器的粒径范围为2.0 ~ 20.0 μm。在土壤提取液中进行富集培养后，对过滤器上收集到的活囊数进行了估计。样本主要采集于1997年春秋季和冬季，全年丰度从低于检测值（<0.05 m−3）到1.08个包囊m−3，总体平均值为0.25 m−3（SE=0.05）。并不是所有的分离株都被鉴定为物种，但在研究中，发现了25种不同的形态。鞭毛虫和裸变形虫是最常见的原生动物（如囊肿）；纤毛虫很少见。这反映了土壤中这些类群的丰富程度，而土壤是本研究中大多数空气传播原生动物最有可能的来源。囊泡的浓度通常随着大气中粒子总量的增加而增加。颗粒和囊泡的浓度均表现出较大的变幅，但两者的最大值均出现在风速较大和相对湿度较低的日子。
The abundance of heterotrophic protists (as protozoan cysts) in the near-surface tropospheric air of Rapid City, SD, was determined using a filtration sampler capable of collecting particles in the 2.0 to 20.0 μm size range (sampling rate ca. 16 l min−1). The number of viable cysts collected on the filter was estimated after enrichment cultivation in soil extract medium. Samples were mainly collected in the spring, fall and winter of 1997 and abundances throughout the year ranged from below detection (<0.05 m−3) to 1.08 cysts m−3with an overall mean of 0.25 m−3(SE=0.05). Not all of the isolates were identified to species but, over the study, 25 different morphotypes were found. Flagellates and naked amoebae were the commonest protozoa (as cysts) found; ciliates were rare. This reflects the abundance of these groups in soils, the likeliest source of most of the airborne protozoa in this study. The concentration of cysts generally increased as a function of the total particles in the atmosphere. The concentration of both particulates and cysts exhibited a wide range of variability, but highest values of both occurred on days with higher winds and lower relative humidity.