Testate amoebae colonizing a newly exposed land surface are of airborne origin

Testate amoebae colonizing a newly exposed land surface are of airborne origin
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定居在新暴露的陆地表面的有遗嘱变形虫是空气传播的

DOI:
10.1016/j.ecolind.2014.07.037
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发表时间:
2015
影响因子:
6.9
通讯作者:
Sommer
Sommer
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Wanner;Sommer

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我们假设,在陆地生态系统发展的最初阶段,空气中的有壳阿米巴在促进有机体定殖和相关的土壤过程中发挥了关键作用。因此,我们分析了空气传播有壳阿米巴的大小和数量,以及空气传播有壳阿米巴在新的陆地表面(实验场地“鸡溪”,人工采矿后集水区)上的移民和殖民化成功。在91天的70个诱捕器暴露试验中,鉴定出12种气传有壳变形虫,其中最常见的是端足弗氏阿米巴(Phryganella acropodia,占总数的51%,直径约35-45 μm)和泥炭刺水蚤(Centropyxis sphagnicola,占总数的23%,最长轴约55-68 μm)。我们外推了61个个体d− 1 m −2(活的和死的个体的总和)的空中阿米巴沉积。尽管有必要有更长的序列(额外的几年),但我们对空中移民的“目标基底”(集水区)的分析可能表明,群落聚集的开始从随机(可变)转变为更具确定性(稳定)过程。这一转变被分配到一个年龄为7年的初始土壤发展。虽然有经验的专家进行这些耗时的研究是必要的,所提出的数据表明,陆地阿米巴是合适的指标,初步生态系统的开发和利用。
We hypothesized that at the very beginning of terrestrial ecosystem development, airborne testate amoebae play a pivotal role in facilitating organismic colonization and related soil processes. We, therefore, analyzed size and quantity of airborne testate amoebae and immigration and colonization success of airborne testate amoebae on a new land surface (experimental site “Chicken Creek”, artificial post-mining water catchment). Within an altogether 91-day exposure of 70 adhesive traps, 12 species of testate amoebae were identified to be of airborne origin.Phryganella acropodia(51% of all individuals found, diameter about 35–45 μm) andCentropyxis sphagnicola(23% of all individuals found, longest axis about 55–68 μm), occurred most frequently in the adhesive traps. We extrapolated an aerial amoeba deposition of 61 individuals d−1m−2(living and dead individuals combined). Although it would be necessary to have a longer sequence (some additional years), our analysis of the “target substrate” of aerial immigration (catchment site) may point to a shift from a stochastic (variable) beginning of community assembly to a more deterministic (stable) course. This shift was assigned to an age of seven years of initial soil development. Although experienced specialists are necessary to conduct these time-consuming studies, the presented data suggest that terrestrial amoebae are suitable indicators for initial ecosystem development and utilization.
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