Bournemouth University, Faculty of Science and Technology, Department of Life and Environmental Sciences, Talbot Campus, Fern Barrow, Poole BH12 5BB, UK.
Bournemouth University, Faculty of Science and Technology, Department of Life and Environmental Sciences, Talbot Campus, Fern Barrow, Poole BH12 5BB, UK.
Protist. 2022 Feb;173(1):125855. doi: 10.1016/j.protis.2021.125855. Epub 2021 Dec 31.
Ciliated protozoa play important ecological roles in soils, yet few studies have investigated the effect of soil pollution on them. We determined the effect of copper (Cu) and cypermethrin on a soil ciliate community under microcosm conditions. Soils were treated with Cu or cypermethrin and the abundance and species richness of ciliates determined 15 days later. Cu treatment increased soil ciliates abundance at the highest concentration (960 mg kg), as did cypermethrin at a treatment of 160 mg kg. No negative effect on ciliate abundance was found for either substance due to increased numbers of tolerant species, particularly Homalogastra setosa and Chilodonella uncinata in the case of Cu and Colpoda stenii and Colpoda inflata for cypermethrin treatments. However, several species were absent at high treatment levels. Notably, Halteria grandinella was not found in Cu treatments above 240 mg kg, whilst Oxytricha setigera was not found in cypermethrin treatments above 160 mg kg. For Homalogastra setosa, there was an initial positive response to cypermethrin, but abundance then decreased at a treatment of 320 mg kg, and treatment at 640 mg kg eradicated the species from the microcosms. Accordingly, both substances affected the structure of the soil ciliate community at high concentrations.
纤毛虫在土壤中发挥着重要的生态作用，但很少有研究调查土壤污染对它们的影响。我们在微宇宙条件下确定了铜 (Cu) 和氯菊酯对土壤纤毛虫群落的影响。用 Cu 或氯菊酯处理土壤，并在 15 天后确定纤毛虫的丰度和物种丰富度。Cu 处理在最高浓度（960 mg kg）下增加了土壤纤毛虫的丰度，氯菊酯在 160 mg kg 的处理下也增加了丰度。由于耐受物种数量的增加，这两种物质对纤毛虫丰度都没有产生负面影响，特别是在 Cu 处理中 Homalogastra setosa 和 Chilodonella uncinata，而在氯菊酯处理中则是 Colpoda stenii 和 Colpoda inflata。然而，在高处理水平下，有几个物种不存在。值得注意的是，Halteria grandinella 在 Cu 处理超过 240 mg kg 时未被发现，而 Oxytricha setigera 在氯菊酯处理超过 160 mg kg 时未被发现。对于 Homalogastra setosa，氯菊酯最初有积极的反应，但在 320 mg kg 的处理下丰度随后下降，而在 640 mg kg 的处理下，该物种从微宇宙中被消灭。因此，这两种物质在高浓度下都影响了土壤纤毛虫群落的结构。
