Community Structure of Soil Nematodes Associated with Solanum Tuberosum

In order to elucidate the distribution of soil nematodes in coastal wetlands and the effect of different distance from the sea line on soil nematode communities, we investigated the community structure of soil nematodes in one wetland perpendicularly oriented from Bohai sea coastline. In June 2006, soil samples were collected from the Yellow River Delta wetlands, in Dongying city of Shandong Province, China. Soil nematode communities were analyzed at the depths of 0–10 and 10–20 cm. The results showed that plant parasite nematodes were the most abundant trophic groups in both depths and at four sites. The average relative abundance was 91.33% of the nematode community. Several ecological indices which reflected soil nematode community structure, diversity, maturity and plant parasitism were compared in these four sites. The results indicated that the maturity index (MI) and plant parasitism index (PPI) were more sensitive than the other indices for assessing the response of soil nematode communities to soil of coastal wetland.

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Sulfur deposition changed the community structure of soil nematodes by affecting omnivores-predators

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.144912 ◽

2021 ◽

Vol 771 ◽

pp. 144912

Author(s):

Ailin Zhang ◽

Olusanya Abiodun Olatunji ◽

Akash Tariq ◽

Tianpeng Li ◽

Ruzhen Wang ◽

...

Keyword(s):

Community Structure ◽

Soil Nematodes ◽

Sulfur Deposition

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Effects of Mowing Frequency on Soil Nematode Diversity and Community Structure in a Chinese Meadow Steppe

Sustainability ◽

10.3390/su13105555 ◽

2021 ◽

Vol 13 (10) ◽

pp. 5555

Author(s):

Jinling Zhao ◽

Jiale Chen ◽

Honghui Wu ◽

Linghao Li ◽

Fengjuan Pan

Keyword(s):

Community Structure ◽

Critical Factor ◽

Terrestrial Ecosystems ◽

Structure Stability ◽

Soil Nematode ◽

Soil Nematodes ◽

Grassland Ecosystems ◽

Management Measures ◽

Nematode Diversity ◽

The Stability

Soil nematodes are one of the most important components in terrestrial ecosystems and the critical factor driving the belowground process. The grasslands of Northeast China have been subject to mowing for ages, which theoretically should have had substantial effects on the processes associated with soil nematodes. However, relevant studies have barely been conducted to date. This study examined variations in soil nematode abundance, biomass, diversity, and community structure, with respect to varying mowing frequencies. The results showed that a higher mowing frequency significantly reduced the abundance of soil nematodes, biomass, diversity, and community structure stability in the ecosystem, while intermediate mowing frequency enhanced these parameters to different extents. Our findings indicate that the changing patterns of the nematode indices with mowing frequency conform to the intermediate disturbance theory. This study provides a theoretical basis for formulating grassland-related management measures and maintaining the stability of grassland ecosystems.

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Effect of transgenic insect-resistant maize to the community structure of soil nematodes in two field trials

Helminthologia ◽

10.1515/helmin-2015-0001 ◽

2015 ◽

Vol 52 (1) ◽

pp. 41-49

Author(s):

A. Čerevková ◽

L Cagáň

Keyword(s):

Community Structure ◽

Food Web ◽

Field Trials ◽

Soil Nematode ◽

Soil Nematodes ◽

Soil Food Web ◽

Bt Maize ◽

Maize Hybrid ◽

Nematode Communities ◽

Soil Nematode Communities

Summary The aim of this study was to determine the effects of Bt maize hybrid cultivation on soil nematode communities in two field trials, as well as to analyse other factors (fertilisation and moisture) responsible for the community structure of soil nematodes. Nematode communities were studied in maize plots at the locality of Borovce in western Slovakia. During 2012 and 2013, hybrids DK440 and DKC3871 (conventional) or DKC4442YG and DKC3872YG (Bt maize, event MON810) were sown in 10 repetitions each. Nematodes were extracted from soil samples collected at the maize flowering (July 11, 2012 and July 30, 2013). Altogether, 39 nematode species belonged to 35 genera were identified in two maize variants. The dominant taxa in both variants were Acrobeloides nanus, Ce-phalobus persegnis, Aphelenchoides composticola, Aphelenchus avenae, Eudorylaimus carteri and Filenchus vulgaris. Calculation of the maturity index, plant parasitic index, enrichment index and structure index did not confirm any clear influence of year or hybrid type on soil nematode communities. The proportional representation of cp-1, cp-2 and cp-3-5 groups of nematode fauna indicated conditions of low stability and high stress. Faunal profiles representing the structure and enrichment conditions of the soil food web showed an environment with a high C:N ratio and high levels of fungal feeders. Based on the calculation of the metabolic footprint of nematodes in the soil food web, a difference between the isoline maize variant and Bt maize variant in 2012 was found, but this difference was not readily apparent in 2013. The occurrence of nematodes, their abundance, proportion of feeding types and selected ecological indices did not depend on the type of maize hybrid (Bt or non-Bt). Thus, the cultivation of genetically modified maize did not directly influence nematode populations. The application of fertiliser at certain periods does not influence the nematode community. The observed significant higher abundance of nematodes was correlated with soil moisture.

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Effects of Grazing Intensity on Soil Nematode Community Structure and Function in Different Soil Layers in a Meadow Steppe

10.21203/rs.3.rs-201553/v1 ◽

2021 ◽

Author(s):

Fengjuan Pan ◽

Ruirui Yan ◽

Jinling Zhao ◽

Linghao Li ◽

Yanfeng Hu ◽

...

Keyword(s):

Community Structure ◽

Soil Layer ◽

Nematode Community ◽

Soil Nematode ◽

Soil Nematodes ◽

Meadow Steppe ◽

Soil Layers ◽

Soil Nematode Community ◽

Nematode Diversity ◽

Grazing Intensities

Abstract Aims Grazing is a key driver of plant communities and soil functions in grassland ecosystems. Soil nematodes play a vital role in soil ecological functions. however, few studies have explored how grazing shapes soil nematode community in different soil layers.Methods we investigated the composition, abundance, diversity, metabolic footprint, and food web metrics of soil nematodes over a gradient of grazing in the 0-10 cm and 10-20 cm soil layers in a meadow steppe. The relationships between nematode community structure and biotic and abiotic factors were analyzed by principal component analysis (PCA) and structural equation model (SEM) analysis. Results Light grazing tended to increase the abundance of soil nematodes. Intensive grazing decreased the biomass carbon and metabolic footprints of plant parasites, fungivores, and total soil nematodes in 0-10 cm soils. There was no difference in the biomass carbon and metabolic footprints of soil nematodes among different grazing intensities in the 10-20 cm soil layer. Soil moisture, aboveground biomass, belowground biomass and Shannon diversity of grass contributed more to changes in soil nematode composition in both soil layers. In the 0-10 cm soil layer, grazing directly and indirectly affected soil nematode diversity via soil moisture and aboveground biomass, while grazing directly affected soil nematode diversity in 10-20 cm soil layer. Conclusions Our results indicate that soil depth can weaken the effect of grazing intensities on soil nematode fauna. Grazing affected the soil nematode community structure via different paths in different soil layers.

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