Continental-Scale α- and β-Diversity Patterns of Terrestrial Eukaryotic Microbes: Effect of Climate and Microhabitat on Testate Amoeba Assemblages in Eurasian Peatlands

IF 3.4 2区 环境科学与生态学 Q2 ECOLOGY
Jiahui Su, Yuri A. Mazei, Andrey N. Tsyganov, Natalia G. Mazei, Victor A. Chernyshov, Alexander A. Komarov, Kirill V. Babeshko, Edward A. D. Mitchell, Satoshi Shimano, Damir A. Saldaev, Basil N. Yakimov
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引用次数: 0

Abstract

Aim

The role of environmental factors that shape the large-scale distribution of eukaryotic microbes remains understudied. We aimed to disentangle the impacts of latitudinal and longitudinal gradients on the distribution of Sphagnum-dwelling testate amoebae in mires and to understand the influence of environmental factors related to both local habitats (hummock—lawn—hollows) and regional climates.

Location

A range from temperate to subarctic and from the European part to the Far East of Russia (51°–70°N, 32°–158°E).

Taxon

Testate amoeba (Arcellinida, Euglyphida, and Amphitremida).

Methods

We analysed the testate amoeba (TA) composition and abundance data from 816 samples collected in 75 peatlands. Linear mixed-effects models and redundancy analysis were applied to determine the likely environmental drivers of TA α- and β-diversity.

Results

We identified a significant reversed latitudinal gradient in α-diversity which negatively correlated with the mean annual temperature. This gradient is microhabitat-specific, being prominent in lawn and hollow microhabitats, but not in hummocks. Longitude, which corresponds mainly to a gradient of precipitation seasonality, was a significant predictor of TA β-diversity, especially in hollows.

Main Conclusions

Our findings identify climatic factors (e.g., mean annual temperature and precipitation seasonality) as likely shaping the continental-scale TA α- and β-diversity patterns, emphasising the microhabitat-specific nature of these relationships. The absence of pattern in hummocks is interpreted as evidence for a predominant microhabitat stress (i.e., low moisture and pH) in this habitat.

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来源期刊
Journal of Biogeography
Journal of Biogeography 环境科学-生态学
CiteScore
7.70
自引率
5.10%
发文量
203
审稿时长
2.2 months
期刊介绍: Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.
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