The Kamchatka Peninsula in the far east of Russia is a substantial landmass that is poorly documented in terms of most elements of biodiversity. Here we provide the first study of modern assemblages of testate amoebae, a widespread group of protists that are particularly abundant in soils. We present a data set of 78 widely distributed samples, including forest, fen, scrub and bog habitats. Testate amoebae are abundant and diverse across Kamchatka with 119 taxa identified. The assemblage is primarily composed of widespread taxa, but rarer occurrences such as Cyclopyxis puteus hint at important biogeographical differences that will require confirmation with molecular data. Assemblages from mineral soils are significantly different from those of peatlands with the former characterized by small idiosome taxa and the latter by larger taxa, often with secretion tests. Water table depth explained significant variance in the peatland samples, supporting the use of testate amoebae in palaeoecological studies. This study adds to our knowledge of the biodiversity of Kamchatka and the global biogeography of protists, and it paves the way for palaeoecological studies to understand long-term environmental change in this region.

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来自俄罗斯堪察加半岛的当代遗嘱变形虫组合的首次记录以及古环境重建的潜力

俄罗斯远东的堪察加半岛是一块巨大的陆地，就生物多样性的大多数元素而言，其记录很少。在这里，我们提供了对现代变形虫现代组合的首次研究，变形虫是一种广泛存在于土壤中的原生生物群。我们提供了一个包含 78 个广泛分布的样本的数据集，包括森林、沼泽、灌木丛和沼泽栖息地。遗嘱变形虫在堪察加半岛丰富多样，确定了 119 个分类群。该组合主要由分布广泛的分类群组成，但很少见，如Cyclopyxis puteus暗示需要用分子数据确认的重要生物地理差异。矿质土壤的组合与泥炭地的组合显着不同，前者的特征是小类群，后者的特征是较大的类群，通常进行分泌测试。地下水位深度解释了泥炭地样本的显着差异，支持在古生态研究中使用遗嘱变形虫。这项研究增加了我们对堪察加半岛生物多样性和全球原生生物生物地理学的了解，并为古生态研究了解该地区的长期环境变化铺平了道路。