Distributional patterns of soil nematodes in relation to environmental variables in forest ecosystems
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https://doi.org/10.1007/s42832-020-0069-8
RESEARCH ARTICLE
Distributional patterns of soil nematodes in relation to environmental variables in forest ecosystems Haifeng Xiao1,3, Wenting Wang1,4, Shangwen Xia1,2, Zhipeng Li1,4, Jianmin Gan1, Xiaodong Yang1,2 ,* 1 Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xishuangbanna 666303, China 2 Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Xishuangbanna 666303, China 3 College of Chemistry, Biology and Environmental Engineering, Xiangnan University, Chenzhou 423000, China 4 University of Chinese Academy of Sciences, Beijing 100049, China
HIGHLIGHTS
GRAPHICAL
ABSTRACT
• Relationships between environmental factors and nematode distributions at different spatial scales are assessed. • Nematode diversity peaked in tropical forest ecosystem. • Nematode diversity showed contrary patterns compared with their abundance. • Factors most strongly affecting nematode communities changed across spatial scales.
ARTICLE INFO
ABSTRACT
Article history:
Understanding biodiversity and biogeographic distribution of soil fauna is an important topic in ecology. While nematode communities have been compared among ecosystems, knowledge remains limited about how environmental factors and nematode distributions are linked at different spatial scales. Here, we employed high-throughput sequencing to compare nematode communities in tropical (Xishuangbanna), subtropical (Ailaoshan), and cold temperate spruce-fir (Lijiang) forest ecosystems with identical spatial sampling. Relationships between nematode communities and environmental factors were analyzed using redundancy analysis (RDA). Our results showed that nematode richness and diversity peaked in Xishuangbanna; however, no significant differences were observed in other two forest ecosystems. Bacterial feeders and Omnivores / Carnivores (Om & Ca) had the lowest relative abundance, but the highest diversity, in Xishuangbanna, with the opposite pattern being detected for fungal and plant feeders. Our data also demonstrated that, for forest ecosystems, climate factors drive nematode communities distributions at the regional scale, while terrain and soil characteristics (including pH and nutrients) drive nematode communities distributions at local scales. This study improves our current understanding of key factors (environmental parameters) responsible for the biogeographical distribution of forest nematode communities at different spatial scales.
Received July 30, 2020 Revised September 23, 2020 Accepted October 15, 2020 Keywords: Nematode communities Spatial scales Driving factors High-throughput sequencing forest ecosystems
© Higher Education Press 2020
* Corresponding author E-mail address: [email protected] (X. Yang)
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1 Introduction A scientific understanding of biological distribution patterns across different spatial scales is required to explain relationships between aboveground and belowground biodiversity in terrestrial ecosystems (
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