Nematode community composition and diversity associated with a topoclimatic transect in a rain shadow desert

Steinberger, Yosef; Liang, Wenju; Savkina, E.; Meshi, Tania; Barness, G.

doi:10.1016/s1164-5563(01)01107-4

Cited by 23 publications

(8 citation statements)

References 16 publications

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“…The increase in soil moisture content observed in the alpine tundra may be due to rainfall formation. According to Steinberger et al (2000), rainfall increased with the increment of altitude.…”

Section: Discussionmentioning

confidence: 99%

“…This may result in direct and indirect impacts on the biosphere (Coleman and Bazzaz 1992;Mooney 1991), thus changing the activity, feeding habits and taxonomic diversity of the soil biotic community (Yeates 1987). Any discussion on predicting the direct and indirect response of soil biota to climatic changes is therefore subject to the limitations of climate projections (Steinberger et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Soil nematode community structure on the northern slope of Changbai Mountain, Northeast China

Tong

Xiao

Wang

2010

Journal of Forestry Research

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Soil nematode communities were investigated in the Changbai Mountain in Broad-leaved Korean Pine forest, Korean Pine and spruce-fix mixed forest, Dark Coniferous forest, Erman's birch forest and Alpine tundra along different altitude gradients from 762 m to 2 200 m a.s.l. Soil animal samples were collected from the litter layer and the soil depth of 0−5 cm, 5−10 cm and 10−20 cm at each site in the spring of 2001 and 2002. In total 27 nematode families and 60 genera were observed. The dominant genera were Plectus Bastian and Tylenchus Bastian and most of them live in litter layer. The total number of soil nematode was significantly correlated with soil moisture (r=0.357; p<0.01).Nematodes were classified in bacterivores, fungivores, plant parasites, omnivores-predators, and omnivores according to known feeding habitats or stoma and esophageal morphology. Species richness of fungivorous nematode was higher than others in different vegetation communities and soil depths. The total number of soil nematode and trophic groups varied significantly (p<0.05) in response to different soil depths. The fungivore/bacterivore ratio (F/B) and the ratio of (fungivores + bacterivores)/plant-parasites (WI) also changed significantly (p<0.05) in different soil depths. In conclusion, soil moisture is proved to be one of the most important variables affecting nematode density and trophic Foundation project:

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soil nematode community structure on the northern slope of Changbai Mountain, Northeast China

Tong

Xiao

Wang

2010

Journal of Forestry Research

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“…Ecological indices such as trophic diversity (Yeates and Bird, 1994;Steinberger et al, 2001;Neher and Darby, 2005) and Shannon index (Freckman and Ettema, 1993) were useful for defining the differences between the slopes, whereas the genus dominance (McSorley and Frederick, 1996) and maturity index (Bongers, 1990;Wasilewska, 1994) changed with altitude.…”

Section: Discussionmentioning

confidence: 99%

Do slope orientation and sampling location determine soil biota composition?

et al. 2009

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Evolution Canyon" is a typical Mediterranean-basin canyon with a summer dry stream at the bottom and large differences in vegetation cover and solar radiation between the north-facing slope (NFS) and the south-facing slope (SFS). It is known to act as an abiotic mediator influencing the community structure of soil fauna. The aim of this study was to determine the spatial dispersion of soil microbial and free-living nematode communities in the open sites (between shrubs) in the upper (0-10 cm) soil layer at four altitudes on both slopes. The combination of relative soil moisture availability and temperature, known to be one of the main triggers for soil biota activity, was explained by slope orientation. The above-mentioned differences were found to significantly affect microbial biomass and CO 2 evolution resulting in temporary stress, corresponding to higher values in metabolic quotient (qCO 2 ) values. These differences may represent microbial investment in energy in order to overcome stress resulting from the microclimatic differences between the two slopes. Moreover, the degree of substrate limitation (primary production due to the differences in plant cover) of microbial activity was explained by the difference in microbial functional groups. The total abundance of soil free-living nematodes was found to be 2-fold higher on the SFS than on the NFS. Thirty-nine genera, including 12 bacteria-feeders, 5 fungifeeders, 12 plant-parasites, and 10 omnivore-predators, were found at the study site, with 34 genera on the NFS and 29 on the SFS. The generic diversity of the bacteriafeeding nematodes was higher on the SFS than on the NFS. This study elucidates the importance of slope orientation and its effect on the structural levels of soil microbial and nematode communities.

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“…In this study, the F/B ratio was lower than 1 in both sugarcane (0.30± 0.78) and in forest (0.04±0.18) areas. Liang et al (2001) recorded similar values in peanut cropping; Tong et al (2010) in forest and Steinberger et al (2001) in desert. The low F/B ratio indicates decomposition of organic matter was based more on bacterial than fungal action.…”

Section: Nematode Community Indicesmentioning

confidence: 83%

Effects of soil mechanical resistance on nematode community structure under conventional sugarcane and remaining of Atlantic Forest

Cardoso

Pedrosa

Rolim

et al. 2011

Environ Monit Assess

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Nematodes present high potential as a biological indicator of soil quality. In this work, it was evaluated relations between soil physical properties and nematode community under sugarcane cropping and remaining of Atlantic Forest areas in Northeastern Pernambuco, Brazil. Soil samples were collected from September to November 2009 along two 200-m transects in both remaining of Atlantic Forest and sugarcane field at deeps of 0-10, 10-20, 20-30, 30-40, and 40-50 cm. For soil characterization, it was carried out analysis of soil size, water content, total porosity, bulk density, and particle density. The level of soil mechanical resistance was evaluated through a digital penetrometer. Nematodes were extracted per 300 cm(3) of soil through centrifugal flotation in sucrose being quantified, classified according trophic habit, and identified in level of genus or family. Data were analyzed using Pearson correlation at 5% of probability. Geostatistical analysis showed that the penetration resistance, water content, total porosity, and bulk density on both forest and cultivated area exhibited spatial dependence at the sampled scale, and their experimental semivariograms were fitted to spherical and exponential models. In forest area, the ectoparasites and free-living nematodes exhibited spherical model. In sugarcane field, the soil nematodes exhibited pure nugget effect. Pratylenchus sp. and Helicotylenchus sp. were prevalent in sugarcane field, but in forest, there was prevalence of Dorylaimidae and Rhabditidae. Total amount of nematode did not differ between environments; however, community trophic structure in forest presented prevalence of free-living nematodes: omnivores followed by bacterial-feeding soil nematodes, while plant-feeding nematodes were prevalent in sugarcane field. The nematode diversity was higher in the remaining of Atlantic Forest. However, the soil mechanical resistance was higher under sugarcane cropping, affecting more directly the free-living nematodes; especially Dorylaimidae which was the most sensible to changes in soil physical properties.

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Nematode community composition and diversity associated with a topoclimatic transect in a rain shadow desert

Cited by 23 publications

References 16 publications

Soil nematode community structure on the northern slope of Changbai Mountain, Northeast China

Soil nematode community structure on the northern slope of Changbai Mountain, Northeast China

Do slope orientation and sampling location determine soil biota composition?

Effects of soil mechanical resistance on nematode community structure under conventional sugarcane and remaining of Atlantic Forest

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