Densities of Benthic Protozoa and Nematodes in a Piedmont Stream
Densities of Benthic Protozoa and Nematodes in a Piedmont Stream
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山前溪流中底栖原生动物和线虫的密度
DOI：
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发表时间：
1989
影响因子：
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通讯作者：
L. Kaplan
中科院分区：
文献类型：
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作者：
T. Bott;L. Kaplan
原生动物的密度在沉积物和叶积累在一阶春泉，并在沉积物和石头上的第三阶流达到超过17个月的时间。从显微镜计数获得的密度高于从最可能数测定获得的密度（当将样品的系列稀释液接种到细菌化Cerophyl的重复培养物中时，从生长反应中获得的数量的统计估计值）。原生动物密度较高，每单位面积的沉积物比每单位面积的树叶或岩石表面。微鞭毛虫密度在渗漏中为9.00 ×<sup>105</sup> ~ 2.29 ×<sup>107</sup>/cm<sup>2</sup>（x ± 1 SD = 5.32 ± 7.36 ×<sup>106</sup>，n = 15），在溪流中为6.00 ×<sup>105</sup>~ 1.04 ×<sup>107</sup>/cm<sup>2</sup>（2.06 ± 2.32 ×<sup>106</sup>，n = 18）。渗漏中纤毛虫密度为5.00 ×<sup>103</sup> ~ 3.32 ×<sup>104</sup>/cm<sup>2</sup>（1.54 ± 1.09 ×<sup>104</sup>，n = 5），溪流中纤毛虫密度为5.00 ×<sup>103</sup> ~ 3.65 ×<sup>104</sup>/cm<sup>2</sup>（1.09 ± 0.88 ×<sup>104</sup>，n = 12）。通过筛分、在蔗糖中浮选和离心的组合从沉积物中分离线虫，并在显微镜下计数。细颗粒沉积物中线虫密度为0.90 ~ 8.85/cm<sup>2</sup>（x ± 1 SD = 4.2 ± 1.9，n = 15），粗颗粒沉积物中线虫密度为0.20 ~ 1.80/cm<sup>2</sup>（1.1 ± 0.2，n = 7）。
Densities of protozoa in sediments and leaf accumulations in a first-order spring seep, and in sediments and on stones in a third-order stream reach were determined over a 17-mo period. Higher densities were obtained from microscopic counts than from determinations of most probable number (a statistical estimate of number derived from growth responses when serial dilutions of sample are inoculated into replicate cultures of bacterized Cerophyl). Protozoa densities were higher per unit area of sediment than per unit area of leaves or rock surfaces. Microflagellate densities in sediments ranged from 9.00 × 10<sup>5</sup> to 2.29 × 10<sup>7</sup>/cm<sup>2</sup> (x̄ ± 1 SD = 5.32 ± 7.36 × 10<sup>6</sup>, n = 15) in the seep and from 6.00 × 10<sup>5</sup> to 1.04 × 10<sup>7</sup>/cm<sup>2</sup> (2.06 ± 2.32 × 10<sup>6</sup>, n = 18) in the stream. Ciliate densities ranged from 5.00 × 10<sup>3</sup> to 3.32 × 10<sup>4</sup>/cm<sup>2</sup> (1.54 ± 1.09 × 10<sup>4</sup>, n = 5) in the seep and from 5.00 × 10<sup>3</sup> to 3.65 × 10<sup>4</sup>/cm<sup>2</sup> (1.09 ± 0.88 × 10<sup>4</sup>, n = 12) in the stream. Nematodes were separated from sediments by a combination of sieving, flotation in sucrose, and centrifugation, and were counted microscopically. Nematode densities in sediments in the stream ranged from 0.90 to 8.85/cm<sup>2</sup> in fine sediments (x̄ ± 1 SD = 4.2 ± 1.9, n = 15) and from 0.20 to 1.80/cm<sup>2</sup> (1.1 ± 0.2, n = 7) in coarse sediments.