Distribution of and insights from soil protozoa of the Olympic coniferous rain forest
Distribution of and insights from soil protozoa of the Olympic coniferous rain forest
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DOI：
10.1016/j.pedobi.2010.05.001
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发表时间：
2010-01-01
期刊：
影响因子：
2.3
通讯作者：
Bamforth, Stuart S.
中科院分区：
文献类型：
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作者：
Bamforth, Stuart S.
分解发生在表层凋落物和土壤中，以支持温带雨林，但对刺激细菌活性和营业额的原生动物知之甚少。我检查了表面凋落物和表层土壤，倒下的日志，和附生植物2米内的土壤表面在奥林匹克国家公园，美国，太平洋西北温带针叶雨林。表层凋落物中的纤毛虫数量为180-580 g（-1）干重，但在底层土壤中减少了20-60%。有壳变形虫在凋落物和土壤中的数量为18，000 - 77，000 g（-1）干重，尽管它们通常在下层土壤中更丰富。腐烂的日志，树木再生必不可少的，支持类似数量的纤毛虫，但两倍的数量有遗嘱的变形虫。在三种附生土壤中，纤毛虫数量为350-550只，有壳变形虫数量为35，000 - 195，000 g（-1）土壤干重。在这些土壤中发现了26种裸泳类、64种纤毛虫和113种有壳变形虫，纤毛虫和有壳变形虫中分别约有65%和45%的个体是小型的r-选择类群。热带雨林土壤原生动物具有独特的有壳变形虫种群，其特征是巨大的生物多样性，顶口物种的优势，Euglypha和Nebela物种的增殖，以及水生类群的出现。纤毛虫和有壳变形虫的生态演替遵循中性模式的加性（非替换）模式。大量的持续性r-选择物种对生态系统干扰的反应是迅速动员起来，恢复必要的噬菌作用，以帮助恢复地上植物群落。(C)2010年Elsevier GmbH。All rights reserved.
Decomposition occurs in the surface litter and soil to support temperate rainforests, but little is known about the protozoa that stimulate bacterial activity and turnover. I examined surface litter and top soils, fallen logs, and epiphytes within 2 m from the soil surface in Olympic National Park, USA, of the Pacific Northwest Temperate Coniferous Rain Forest. Ciliates in surface litter numbered 180-580 g(-1) dry weight, but were reduced by 20-60% in the underlying soils. Testate amoebae numbered 18,000-77,000 g(-1) dry weight in both litter and soil although they were often more abundant in underlying soils. Rotting logs, essential for tree regeneration, supported similar numbers of ciliates, but twice the numbers of testate amoebae. In three epiphytic soils, ciliates numbered 350-550, and testate amoebae 35,000-195,000 g(-1) dry weight of soil. In these soils, 26 species of gymnamoebae, 64 species of ciliates, and 113 species of testate amoebae were found. About 65% of the individuals in ciliate and 45% in testate amoebae populations were small, r-selected taxa. Rain forest soil protozoa have distinct testate amoebae populations, and are characterized by enormous biodiversity, the dominance of acrostome species, the proliferation of Euglypha and Nebela species, and the appearance of aquatic taxa. Ecological succession of ciliates and testate amoebae follows an additive (non-replacement) pattern according to a neutral model. The large numbers of persistent r-selected species respond to ecosystem disturbances by mobilizing quickly to resume the bacterivory necessary to help restore the recovering above-ground plant community. (C) 2010 Elsevier GmbH. All rights reserved.