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78 results for “soil nematodes”
Soil physical, biological, chemical, and carbon data and cover crop biomass data from Sac Valley almond orchard comparing multiple cover crop compositions with resident vegetation for effects on soil health and nematodes
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Data from: Contrasting impacts of nitrogen enrichment on soil nematode diversity in natural and managed ecosystems
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Spatial patterns and ecological drivers of soil nematode β-diversity in natural grasslands vary among vegetation types and trophic position
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Data from: Herbivore species and patch heterogeneity modulate grazing-induced shifts in soil nematode trophic structure and energy flux
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The soil bacterium Lysobacter capsici attaches to the nematode surface, and triggers induced systemic resistance in barley, impairing the invasion of root-lesion nematodes
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Drivers of nematode diversity in forest soils across climatic zones
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Soil fertility as a mediator of interactions between an introduced specialist beetle and a native generalist nematode on an exotic invasive plant and its native congener
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Long-term nitrogen addition alters the community and energy channel but not diversity of soil nematodes in a subtropical forest
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Functional traits of soil nematodes define their response to nitrogen fertilization
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Data from: High-throughput sequencing of nematode communities from total soil DNA extractions
Background: Nematodes are extremely diverse and numbers of species are predicted to be more than a million. Studies on nematode diversity are difficult and laborious using standard methods such as identification based on morphology and therefore high-throughput sequencing is an attractive alternative. Generally, primers that have been used for generating amplicons for sequencing are not nematode specific and also amplify other groups such as fungi and plantae. Thus a nematode enrichment step must be included that may introduce biases. Results: An amplification strategy, including a new primer, which selectively amplifies nematodes and other metazoans was developed. When this strategy was tested on DNA templates from a set of 22 agricultural soils, we obtained 64.4 % sequences of nematode origin in total, whereas the remaining sequences were almost entirely metazoan. The nematode sequences were derived from a broad taxonomic range and most sequences were from nematode taxa that have previously been found to be abundant in soil such as Tylenchida, Rhabditida, Dorylaimida, Triplonchida and Araeolaimida. Conclusions: This amplification and sequencing strategy for assessing nematode diversity was demonstrated to be able to collect a broad taxonomy of nematodes without prior enrichment and thus the method will be highly valuable in ecological studies of nematodes. Keywords: nematode, community, next-generation sequencing, SSU, diversity, 18S, rDNA
Data from: Patterns of earthworm, enchytraeid and nematode diversity and community structure in urban soils of different ages
Annelids (Lumbricidae and Enchytraeidae) and nematodes are common soil organisms and play important roles in organic matter decomposition, nutrient cycling and creation of soil structure and porosity. However, these three groups have rarely been studied together and only few studies exist for urban soils. We studied the diversity and community composition of annelids and nematodes in soils spanning more than two centuries of urban soil development in Neuchâtel (Switzerland) and assessed the relationships 1) among these three groups and 2) between each group and environmental (physical, chemical and functional) characteristics of soils and soil age. While the groups of environmental variables were correlated (Mantel tests) no correlation was found between pairs of soil fauna groups and between each soil fauna group and environmental variables. More specifically, redundancy analyses showed that earthworm assemblages were best correlated with soil bulk density and with soil depth, the latter being positively correlated with soil age. Enchytraeid assemblages and the proportion of enchytraeid r-strategists were respectively best correlated with soil carbonate content and negatively correlated with soil age. Nematodes assemblages were best correlated with soil water content. Moreover, relationships between pairs of soil biota groups, and between each group and environmental (physical, chemical and functional) variables, varied along the soil age gradient (moving window analysis). This study provides new knowledge on urban soil biodiversity and how environmental conditions can influence soil diversity and community patterns in the urban context. The contrasted community patterns of earthworms, enchytraeids and nematodes in urban soils of different ages and their different ecological roles suggest that they represent potential complementary indicators of soil quality and functioning such as soil formation and organic matter dynamics.
Dataset for: Relative contribution of high and low elevation soil microbes and nematodes to ecosystem functioning
<ol> <li><span>Ecosystem productivity is largely dependent on soil nutrient cycling which, in turn, is driven by decomposition rates governed by locally-adapted belowground microbial and invertebrate communities. How climate change will impact soil biota and the correlated ecosystem functioning, however, remains largely an open question.</span></li> <li><span>To address this challenge, we first characterized the functional identity of soil microbial and nematode communities originated from the foothills or in the sub-alpine soils of the Alps, and then, using a full-factorial reciprocal transplant common garden experiment at two elevations, we asked whether soil biota from low elevation were more prone in generating nutrient cycling than high elevation soil biota. Specifically, we separately transplanted soil microbial and nematode to community from low and high elevation in their home or opposite elevation in pots added with a common plant community. </span></li> <li><span>We found evidence for ecotypic and functional differentiation of the microbial and nematode communities growing in. We also observed a decrease in microbial diversity and activity at high elevation, and additionally, through nematodes' functional characterization, we found increased fungal-dominated energy channels at high elevation. </span></li> <li><span>Moreover, while we found little effect of soil biodiversity change based on elevation of origin on plant productivity, soils inoculated with microbes originating from low elevation respired more than those originating at high elevation. This observation correlates well with the observed faster carbon degradation rates by the low-elevation microbial communities. </span></li> <li><span>Climate change can reshuffle soil invertebrate communities depending on organism-specific variation in range expansion, ultimately affecting soil fertility and vegetation productivity.</span></li> </ol>
The functional role and diversity of soil nematodes are stronger at high elevation in the lesser Himalayan mountain ranges
<p>Soil nematodes are a foremost component of terrestrial biodiversity, they display the whole gamut of trophic guilds and life strategies, and by their activity, affect major ecosystem process, such as organic matter degradation and carbon cycling. Based on nematodes' functional types, nematode community indices have been developed, and can be used to link variation in nematodes community composition and ecosystem processes. Yet, the use of these indices has been mainly restricted to anthropogenic stresses. In this study, we propose to expand the use of nematodes' derived ecological indices in order to link soil and climate properties with soil food webs, and ecosystem processes that all vary along steep elevation gradients. For this purpose, we explored how elevation affects the trophic and functional diversity of nematode communities sampled every 300 m, from about 1000 m to 3700 m above sea level, across four transects in the lesser Himalayan range of Jammu and Kashmir. We found that (1) the trophic and functional diversity of nematodes increases with elevation; (2) differences in nematodes communities generate habitat-specific functional diversity; (3) the maturity index (MI), increases with elevation, while the enrichment index decreases, indicating less mature and less productive ecosystems, enhanced fungal-based energy flow, and a predominant role of nematodes in generating carbon influxes at high elevation sites. We thus confirm that the functional contribution of soil nematodes to belowground ecosystem processes, including carbon and energy flow, is stronger at high elevation. Overall, this study highlights the central importance of nematodes in sustaining soil ecosystems and brings insights into their functional role, particularly in alpine and arctic soils.</p>
Multi-level warming alters energy flux by nonlinear effects on soil nematode trophic groups in a mature forest
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A Multinational Trial of the Efficacy of Albendazole Against Soil-transmitted Nematode Infections in Children
ClinicalTrials.gov study NCT01087099. IPD Sharing: Not stated. Countries: 7. Publications: 3.
Data from: High-throughput sequencing of nematode communities from total soil DNA extractions
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Plant genotypic diversity effects on soil nematodes vary with trophic level
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Data from: Patterns of earthworm, enchytraeid and nematode diversity and community structure in urban soils of different ages
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Namibian fairy circles: Hostile territory for soil nematodes
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Dataset for: Relative contribution of high and low elevation soil microbes and nematodes to ecosystem functioning
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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