Nematodes as bioindicators of polluted sediments using metabarcoding and microscopic taxonomy

Schenk, Janina; Höss, Sebastian; Brinke, Marvin; Kleinbölting, Nils; Brüchner-Hüttemann, Henrike; Traunspurger, Walter

doi:10.1016/j.envint.2020.105922

Cited by 32 publications

(15 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, the observed patterns are in agreement with previous studies showing that freshwater meiobenthic communities can become relevant bio-indicators of sediment pollution, water eutrophication or sediment texture (e.g. Haegerbaeumer et al 2017;Schenk et al 2020;Traunspurger et al 2020). However, further studies should detail the response of dominant meiobenthic phyla (e.g.…”

Section: Discussionsupporting

confidence: 91%

Diversity and distribution of benthic invertebrates dwelling rivers of the Kruger National Park, South Africa

Majdi

Necker

Fourie

et al. 2022

KOEDOE - African Protected Area Conservation and Science

Self Cite

View full text Add to dashboard Cite

Meiobenthos (or meiofauna) are microscopic invertebrates that inhabit biofilms and interstitial spaces in rivers. They are diverse and extremely abundant, and they perform essential ecological functions by linking microbial production to higher trophic levels (e.g. macrobenthic invertebrates and fishes). However, meiobenthic communities remain poorly studied in Africa. Here, we sampled meio- and macrobenthic invertebrate communities associated with biofilms and sediments across an upstream–downstream gradient along the Olifants, Sabie and Crocodile rivers flowing through the Kruger National Park (KNP). We expected to link differences in community structure to environmental gradients as those rivers show different degrees of anthropogenic stress as they enter the park. Both meio- and macrobenthic communities differed across rivers and also structured along an upstream–downstream gradient. The upstream sites, which were the closest to the park borders, consistently showed a lower diversity in all three rivers. There, the invasive snail Tarebia granifera strongly dominated (making up 73% – 87% of the macrobenthos), crowding hard substrates, while concomitantly the abundances of biofilm-dwelling meiobenthos like nematodes and rotifers were substantially reduced. Nevertheless, the diversity and evenness of communities then tended to increase as water flowed downstream through the park, suggesting a beneficial effect of protected river reaches on benthic invertebrate diversity. However, for the Crocodile River, which makes up the southern border of the park, this trend was less conspicuous, suggesting that this river may experience the greatest threats. More generally, benthic invertebrate communities were driven by the concentrations of phosphates, sulphates, ammonium and organic matter and by substrate characteristics.Conservation implications: Meiobenthic organisms are very abundant in KNP rivers and react to environmental gradients; thus, they should be more considered for bio-monitoring or conservation of comprehensive assemblages of animals. Interestingly, protected reaches tended to show a reduced dominance of the invasive T. granifera and a higher diversity of benthic invertebrates.

show abstract

Section: Discussionsupporting

confidence: 91%

Diversity and distribution of benthic invertebrates dwelling rivers of the Kruger National Park, South Africa

Majdi

Necker

Fourie

et al. 2022

KOEDOE - African Protected Area Conservation and Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nematodes use as a bio-fertilizer gave benefits in agriculture to raise productivity. About thirty percent of the total inorganic nitrogen was mineralized in the form of soil organic matter that was for consumption soil microorganism [48,59,60]. Microphagous nematodes, establish an important group that effects on micro-organism activity and are important regulators of decomposition and nutrient release processes [41,55].…”

Section: Discussionmentioning

confidence: 99%

Nematodes as Biological Indicators of Soil Quality in the Agroecosystems

Khanum¹,

Mehmood²,

Khatoon³

2022

Nematodes - Recent Advances, Management and New Perspectives

View full text Add to dashboard Cite

Soil nematodes have advantages as bio-indicators, because they have beneficial role in the food web. Nematodes associated with bacteria are probably the most studied biological indicators of soil fertility. Saprophytic nematodes act as bio-indicators of soil health because they have different beneficial ways to increase in soil functions such as in management of ecosystem; enhancement of nitrogen in soil by ingestion of nitrogen and secrete extra nitrogen as NH4, that is easily absorbable; putrefaction and by dispersion of bacteria and fungi to recently available organic residues. Therefore, nematode are beneficial in increasing soil health or plant growth by providing the nutrient through associated bacteria. So it can be evaluated that the nematodes use as biological indicators of soil fertility because of remarkable diversity and nematode contribution in many functions of the soil fertility.

show abstract

“…Sequences that were not identified were omitted from analyses. Nematodes were assigned to genus or a higher taxonomic order based on a similarity of at least 95% to entries in the data base as in previous work ( Schenk et al, 2020 ). The relative abundance of each taxonomic unit within a sample that was not a plant-parasitic nematode was calculated based on its allocated percentage of reads.…”

Section: Methodsmentioning

confidence: 99%

Next-generation sequencing of the soil nematode community enables the sustainability of banana plantations to be monitored

Bell

Namaganda

Urwin

et al. 2021

Applied Soil Ecology

View full text Add to dashboard Cite

Uganda faces a considerable challenge to match its food production to an annual population growth rate of 3%. Cooking bananas are the country's most produced staple crop but the annual national harvest is not increasing. The crop grows on infertile soils that are normally fertilised organically and often susceptible to erosion. Soil nematodes are well-established as bioindicators of soil quality that can support environmental monitoring and assessment of the sustainability of agricultural systems. These invertebrates are a highly ranked indicator of biodiversity with molecular approaches available. Consequently, we have applied next-generation DNA sequencing of soil nematodes to evaluate soil quality of Ugandan banana plantations. The aim is to establish a method for constructing an aspect of an environmental biosafety dossier with the future aim of assessing the impact of transgenic crops and improving current cropping systems. The soil samples did not differ significantly in any of the measured soil chemistry factors, soil texture or percentage of organic matter. Thirty taxons of soil nematodes other than the plant parasites were recovered from soil supporting nine banana plantations plus three each from coffee and banana-coffee interplants from East and West Uganda. Cluster analysis correctly allocated each plantation to the crop/intercrop being grown when based on the abundance of taxa rather than taxa presence or absence. This indicates that the host has considerable effects on the abundance of specific nematode species within the soil. Overall, nematodes were more abundant in soil from coffee plantations than from banana-coffee interplants with the lowest values being from fields supporting just banana. Only the basal and trophic diversity indices and the percentage of nematodes that are rapid colonisers varied between the three plantation types. The soil of all fifteen plantations can be classified as having a mature soil web condition with low physical disturbance, limited chemical stressors, moderately high nutrient enrichment and balanced decomposition channels.

show abstract

Nematodes as bioindicators of polluted sediments using metabarcoding and microscopic taxonomy

Cited by 32 publications

References 73 publications

Diversity and distribution of benthic invertebrates dwelling rivers of the Kruger National Park, South Africa

Diversity and distribution of benthic invertebrates dwelling rivers of the Kruger National Park, South Africa

Nematodes as Biological Indicators of Soil Quality in the Agroecosystems

Next-generation sequencing of the soil nematode community enables the sustainability of banana plantations to be monitored

Contact Info

Product

Resources

About