scholarly journals Comparison of nematode communities in anecic earthworm casts and adjacent soil reveal a land use-independent trophic group signature

2021 ◽  
pp. e01565
Author(s):  
Marie-Liesse Vermeire ◽  
Nicolas Bottinelli ◽  
Cecile Villenave ◽  
Pascal Jouquet ◽  
Huế Nguyễ Thị ◽  
...  
Keyword(s):  
Land Use ◽  
Trophic Group ◽  
Group Signature ◽  
Earthworm Casts ◽  
Nematode Communities ◽  
Adjacent Soil

Soil nematode communities as indicators of soil health in different land use types in tropical area

Nematology ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 595-610 ◽  
Author(s):  
Dandan Gao ◽  
Faming Wang ◽  
Jian Li ◽  
Shiqin Yu ◽  
Zhian Li ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Health ◽  
Trophic Group ◽  
Health Conditions ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Land Use Types ◽  
Bare Land ◽  
Managed Ecosystems ◽  
Soil Nematode Communities

Summary The study of soil nematode communities is a powerful tool that has been widely used as an indicator of soil health. This study explored whether soil nematode composition of different land use types could be used as a baseline to indicate the soil health of both natural and anthropogenic ecosystems. The soil nematode community compositions were documented for five land use types in tropical China: bare land, secondary forest, old forest, eucalyptus plantation and litchi orchards. The first three land use types are natural ecosystems and considered as a vegetation succession, whereas the other two are anthropogenically managed ecosystems. The vegetation succession from bare land to secondary and old forests increased soil nematode abundance, diversity, diversity-weighted abundance and complexity of community structure. During the wet season, the abundances of the total nematodes, bacterivores, fungivores and herbivores were significantly lower in eucalyptus plantation and litchi orchards than in secondary and old forests, but higher than in bare land. During the dry season, the abundances of the total nematodes and each trophic group were greatest in orchards. The pattern of the diversity-weighted abundance of each nematode trophic group was similar to that of nematode trophic group abundance. The results indicate that soil nematode communities of different land use types could be used for comparison of soil health conditions in natural and managed ecosystems. Particularly, the soil health conditions as indicated through nematode communities of the two managed ecosystems were not as good as those of secondary and old forests, whereas litchi orchards might have better soil health conditions than eucalyptus plantations in tropical China.

scholarly journals Analysis of complex trophic networks reveals the signature of land-use intensification on soil communities in agroecosystems

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Juliette M. G. Bloor ◽  
Sara Si-Moussi ◽  
Pierre Taberlet ◽  
Pascal Carrère ◽  
Mickaël Hedde
Keyword(s):  
Land Use ◽  
Food Web ◽  
Agricultural Intensification ◽  
Environmental Dna ◽  
Trophic Group ◽  
Interaction Networks ◽  
Land Use Intensity ◽  
Food Web Structure ◽  
Trophic Networks ◽  
Management Intensity

AbstractIncreasing evidence suggests that agricultural intensification is a threat to many groups of soil biota, but how the impacts of land-use intensity on soil organisms translate into changes in comprehensive soil interaction networks remains unclear. Here for the first time, we use environmental DNA to examine total soil multi-trophic diversity and food web structure for temperate agroecosystems along a gradient of land-use intensity. We tested for response patterns in key properties of the soil food webs in sixteen fields ranging from arable crops to grazed permanent grasslands as part of a long-term management experiment. We found that agricultural intensification drives reductions in trophic group diversity, although taxa richness remained unchanged. Intensification generally reduced the complexity and connectance of soil interaction networks and induced consistent changes in energy pathways, but the magnitude of management-induced changes depended on the variable considered. Average path length (an indicator of food web redundancy and resilience) did not respond to our management intensity gradient. Moreover, turnover of network structure showed little response to increasing management intensity. Our data demonstrates the importance of considering different facets of trophic networks for a clearer understanding of agriculture-biodiversity relationships, with implications for nature-based solutions and sustainable agriculture.

Impact of biochar amendment on soil nematode communities in a West African rain-fed rice cropland

Nematology ◽  
2021 ◽  
pp. 1-12
Author(s):  
Segun O. Oladele ◽  
Adebayo Adeyemo ◽  
Moses Awodun ◽  
Ajoke Adegaye ◽  
Mariko Ingold
Keyword(s):  
Trophic Group ◽  
West African ◽  
Nematode Population ◽  
Available Phosphorus ◽  
Soil Nematode ◽  
Trophic Groups ◽  
Nematode Communities ◽  
Study Results ◽  
Inorganic Fertiliser ◽  
Plant Parasitic

Summary Nematode population and diversity in a West African rain-fed rice cropland amended with biochar (B), biochar plus inorganic fertiliser (B + NPK), inorganic fertiliser (NPK) and control (CK) without amendments were investigated in a 3-year field study. Results demonstrated that significant differences exist between treatments and years of study for total nematode population and nematode trophic groups. Total nematode density, nematode trophic group (bacterivore and plant-parasitic) density were increased and dominant in B + NPK compared with CK after 3 years. Relative abundance of nematode genera according to trophic group across treatments showed Hirschmanniella (23%) as the dominant plant parasites in NPK, and Heterocephalobus (27%), Aphelenchoides (22%) and Eudorylaimus (9%) as dominant bacterivores, fungivores and omnivores-predators, respectively, in B + NPK. Trophic group indicators showed that the fungivore plus bacterivore to plant-parasitic ratio (73%) was significantly increased by B + NPK treatment in comparison to CK. Conversely, treatments exerted no significant effect on the fungivore to bacterivore ratio (F/B) throughout the period of study, which implies less disturbance and adverse impact of biochar on nematode communities. Apart from treatments and environmental factors, changes in nematode trophic groups were strongly related to soil chemical properties, such as soil pH, total nitrogen and available phosphorus, which shows their influence on soil nematode community. Our result shows the positive effect of integrated addition of biochar and inorganic fertiliser in balancing nematode diversity and building a resilient soil ecosystem in a low input rain-fed rice cropping system.

Climate change and land use induce functional shifts in soil nematode communities

Oecologia ◽  
2019 ◽  
Vol 192 (1) ◽  
pp. 281-294 ◽  
Author(s):  
Julia Siebert ◽  
Marcel Ciobanu ◽  
Martin Schädler ◽  
Nico Eisenhauer
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Soil Nematode Communities

scholarly journals Soil nematode community changes associated with windfall and wildfire in forest soil at the High Tatras National Park, Slovak Republic

2009 ◽  
Vol 46 (2) ◽  
pp. 123-130 ◽  
Author(s):  
A. Čerevková ◽  
M. Renčo
Keyword(s):  
National Park ◽  
Slovak Republic ◽  
Trophic Group ◽  
Forest Stand ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Soil Nematode Community ◽  
Research Findings ◽  
Community Changes ◽  
The High Tatras

AbstractThe paper presents research findings on the influence of windfall and wildfire on nematode communities in Lariceto-Piceetum forest in the High Tatras in Slovakia. Comparison was made of an intact (REF), affected and extracted (EXT), non-extracted (NEX) and burnt (FIR) forest stand. A total of 55 species belonging to 36 genera were found. The EXT locality harboured the majority of the identified species, but the highest abundance of nematodes was observed in the FIR locality. Bacterial feeders were the dominant trophic group in all investigated plots. In the REF bacterial feeders were followed by root-fungal feeders, fungal feeders and omnivores, in the EXT by omnivores and plant parasites, in the FIR by omnivores and root-fungal feeders and in the NEX by fungal feeders and omnivores. The MI and SI were higher in the REF and the EXT compared to those in the FIR and the NEX, the highest B/F ratio was observed in the FIR and the highest EI was found in the REF. We can conclude that disturbance of forest vegetation and soil has had a clear and demonstrable impact on nematode communities.

Chemical and physical properties of earthworm casts as compared to bulk soil under a range of different land-use systems in Vietnam

Geoderma ◽  
2008 ◽  
Vol 146 (1-2) ◽  
pp. 231-238 ◽  
Author(s):  
Pascal Jouquet ◽  
Nicolas Bottinelli ◽  
Pascal Podwojewski ◽  
Vincent Hallaire ◽  
Toan Tran Duc
Keyword(s):  
Land Use ◽  
Physical Properties ◽  
Bulk Soil ◽  
Earthworm Casts ◽  
Land Use Systems

Nematode communities of Byers Peninsula, Livingston Island, maritime Antarctica

2011 ◽  
Vol 23 (4) ◽  
pp. 349-357 ◽  
Author(s):  
Uffe N. Nielsen ◽  
Diana H. Wall ◽  
Grace Li ◽  
Manuel Toro ◽  
Byron J. Adams ◽  
...  
Keyword(s):  
Community Composition ◽  
Abiotic Factors ◽  
Biotic Interactions ◽  
Terrestrial Ecosystems ◽  
Nematode Species ◽  
Trophic Group ◽  
Maritime Antarctica ◽  
Nematode Communities ◽  
Livingston Island ◽  
Harsh Conditions

AbstractThe nematode communities of Antarctica are considered simple. The few species present are well adapted to the harsh conditions and often endemic to Antarctica. Knowledge of Antarctic terrestrial ecosystems is increasing rapidly, but nematode communities remain to be explored in large parts of Antarctica. In soil samples collected at Byers Peninsula (Antarctic Specially Protected Area No. 126), Livingston Island we recorded 37 nematode taxa but samples showed great variation in richness and abundance. Nematode richness decreased with increasing soil pH, whereas total abundances, and the abundance of several trophic groups, were greatest at intermediate pH (around 6.5–7). Moreover, the community composition was mainly related to pH and less so to soil moisture. Trophic group, and total nematode, rotifer and tardigrade, abundances were generally positively correlated. Byers Peninsula is thus, by maritime Antarctic standards, a nematode biodiversity hotspot, and the presence of several previously unrecorded genera indicates that nematode species richness in maritime Antarctica is probably underestimated. Our results indicate that abiotic factors influence nematode communities with little evidence for biotic interactions. The unexplained heterogeneity in community composition is probably related to variation in microclimate, vegetation, topography and unmeasured soil properties, but may also be contributed to by biological processes.

scholarly journals Short-term effects of cadmium and mercury on soil nematode communities in a pot experiment

2020 ◽  
Vol 57 (2) ◽  
pp. 145-153
Author(s):  
Y. Lü ◽  
X. Chen ◽  
W.F. Xue ◽  
W.D. Zhang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Diversity Index ◽  
Trophic Group ◽  
Life History Strategies ◽  
Soil Nematode ◽  
Short Term ◽  
Pollution Effects ◽  
Nematode Communities ◽  
Significant Difference

SummaryAnalysis of soil nematode feeding groups and functional guilds were used as a valuable tool to detect heavy metal pollution. Effects of cadmium (Cd) at 5 mg/kg, mercury (Hg) at 20mg/kg, combined Cd and Hg at 5+20mg/kg on the nematode communities were studied after three months application. Nematodes were collected from soil in rhizosphere of Morning glories (Pharhiris nil) which were applied as heavy metal accumulators and were grown in the experimental pots. Both single and combined heavy metals had marked effects on the nematode abundance, life-history strategies and feeding type composition. Bacteriovores and c-p 2 group were found to be the most abundant trophic group and functional guild, respectively. Acrobeloides and Pratylenchus were the most two abundant genera, decreasing number of them was responsible for the significant difference between control and polluted treatments. Cd-5 and Cd-Hg 5+20 presented lower values of nematode diversity index (H’) and evenness index (J’) than Hg-20. The combination of Cd and Hg showed lower nematode trophic diversity (TD), in comparison with single Cd or Hg. Conversely, heavy metals addition exhibited no pronounced effect on Maturity index (MI), structural index (SI) and enrichment index (EI). Our results demonstrate that genera composition is a better indicator to short-term heavy metal effects than some common indicator indices and emphasize that deeper assemblage analyses are needed for a correct interpretation of short-term disturbance on soil nematodes.

Sign in / Sign up

Export Citation Format

Share Document