Migratory behavior of free-living marine nematodes surrounded by sediments experimentally contaminated by mixtures of polycyclic aromatic hydrocarbons

Allouche, Mohamed; Nasri, Ahmed; Harrath, Abdel Halim; Mansour, Lamjed; Beyrem, Hamouda; Boufahja, Fehmi

doi:10.1016/j.jksus.2019.11.025

Cited by 20 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the ivermectin was dissolved in acetone (99.8%), and the sediment was spiked with the drug in a cold dark room at 4°C to avoid any eventual transformation of the ivermectin. The work of Louati et al (2013) and Allouche et al (2020a) proved that acetone is not toxic to meiobenthic nematodes. After three days of acclimatization, the overlying water was removed from the buckets containing natural sediment.…”

Section: Sediment Contamination and Experimental Set-upmentioning

confidence: 99%

Ecotoxic response of nematodes to ivermectin, a potential anti-COVID-19 drug treatment

Essid

Allouche

Lazzem

et al. 2020

Marine Pollution Bulletin

Self Cite

View full text Add to dashboard Cite

At the end of March 2020, ivermectin was confirmed as a drug for COVID-19 treatment. A significant amount of ivermectin could deposit into sediments of the semi-closed Mediterranean Sea, where three European COVID-19 epicenters are located: Italy, Spain, and France. Meiobenthic nematodes were exposed to three ivermectin doses (1.8 ng.g −1 , 9 ng.g −1 , and 18 ng.g −1) for 10 days. Ivermectin caused a great reduction in abundance. However, the diversity indices decreased only at high doses. Ivermectin disadvantaged the 1B-Cr-Id functional type (nonselective deposit feeders and nematodes with circular or indistinct amphids) and benefited the 2A-REL-Sp type (epistrate feeders and nematodes with rounded or elongated loop amphids). Thus, Trophic Diversity and Amphideal Diversity index values increased with sedimentary ivermectin enrichment. Large amphideal foveas were more efficient for 2A-REL-Sp nematodes to avoid ivermectin. The responses of the functional type 2A-REL-Sp and corresponding taxa predict post-COVID-19 environmental concerns and the bioaccumulation of ivermectin in seafoods.

show abstract

Section: Sediment Contamination and Experimental Set-upmentioning

confidence: 99%

Ecotoxic response of nematodes to ivermectin, a potential anti-COVID-19 drug treatment

Essid

Allouche

Lazzem

et al. 2020

Marine Pollution Bulletin

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nematode sensitivities to oil and PAHs are species-specific, with some species persisting in the presence of the pollutants and others displaying increased mortality (Balsamo et al, 2012;Monteiro et al, 2018). Species belonging to the genera Sabateria, Dorylaimopsis, Cheironchus, Rhabditis, and Sphaerolaimus gracilis, Calamicrolaimus honestus, and Oncholaimus campylocercoides were found to be tolerant to oil or PAH pollution (Elarbaoui et al, 2015;Soto et al, 2017;Allouche et al, 2020), while Odontophora villoti, Parasphaerolaimus paradoxus, Trichotheristus mirabilis, Theristus pertenuis, and members of the family Encheliidae were extremely sensitive (Boufahja et al, 2012;Allouche et al, 2020). The other notable trend in literature is that nematode assemblages can recover from oil and hydrocarbon perturbation events.…”

Section: Nematodes As Indicators Of Oil Spills and Hydrocarbon Pollutionmentioning

confidence: 99%

Suitability of Free-Living Marine Nematodes as Bioindicators: Status and Future Considerations

Ridall

Ingels

2021

Front. Mar. Sci.

View full text Add to dashboard Cite

Nematodes are among the most abundant organisms on Earth, and have important roles in terrestrial, freshwater, and marine ecosystems. Free-living marine nematodes have been used successfully as indicators of biological health and ocean pollution for at least the past 40 years, but their use as bioindicators is not ubiquitous. They have been most often used specifically as indicators of heavy metal and hydrocarbon pollution, with far fewer instances of their use as indicators of biological, environmental, or physical perturbations. Although free-living marine nematodes are among the best bioindicators owing to their worldwide distributions, abundances, and genus- and species-specific responses to environmental pollution, there are still some challenges that prevent their use globally. Here, we present a review of characteristics that make free-living marine nematodes excellent bioindicators, recent studies that have used them as bioindicators, and suggestions for future directions in the use of these fauna as indicators in the marine environment. Specifically, we consider the use of marine nematodes for microplastics (an understudied class of pollutants that are a future threat to global biodiversity), the value of current nematode indices as measures of ecosystem health, and the importance of improved and continued international collaboration in the field of marine nematology.

show abstract

“…At the lower concentrations, no sufficient detritus was available to feed nematodes 1B, and they probably were preyed by omnivores-carnovores. The members of this latter trophic category are known to consume freshly dead preys ( Moens and Vincx, 1997 ; Semprucci et al, 2018 ) and being tolerant of extreme conditions, as they are able of developing detoxification mechanisms and thus withstand exposure to xenobiotics ( Cobb, 1931 ; Allouche et al, 2020a , Allouche et al, 2020b , Allouche et al, 2020c ). In the case of nematodes belonging to the feeding type 2A, feeding principally on benthic diatoms, their sensitivity towards HCQ seems to be closely related to their diet.…”

Section: Discussionmentioning

confidence: 99%

“…Based on our results nematodes 2B were extremely tolerant in the high concentrations HCQ2 and HCQ3. In fact, this trophic group is known (1) to show a diet oscillating between facultative predation and deposit feeding ( Moens and Vincx, 1997 ), and (2) for its easy mobility into the sedimentary column ( Allouche et al, 2020a , Allouche et al, 2020b , Allouche et al, 2020c ) which makes it succeptible to a wider contamination potential. As a result, fishes and other seafood sources such as shrimps, lobsters, prawns, and crabs may be easily contaminated by HCQ, through bioaccumulation, due to their feeding habits that might include in their diets nematodes in certain points of their ontogeny ( Wilcox and Jeffries, 1979 ; Albertini-Berhaut, 1974 ; Fitzhugh and Fleeger, 1985 ).…”

Section: Discussionmentioning

confidence: 99%

Toxicity of hydroxychloroquine, a potential treatment for COVID-19, on free-living marine nematodes

Ali

Hedfi

Almalki

et al. 2021

Marine Pollution Bulletin

Self Cite

View full text Add to dashboard Cite

On March 2020, hydroxychloroquine (HCQ) was recommended as a treatment for COVID-19 high risk patients. Following the massive and widespread use of HCQ worldwide, a discernible high quantity is anticipated to end-up through the sewage systems in marine coastal areas. A closed microcosm study was undertaken herein for 30 days where meiobenthic nematodes were exposed to a range of HCQ concentrations (3.162, 31.62 and 63.24 μg.ml −1 ). After one month of exposure in HCQ, the total abundances and Shannon-Wiener index of the assemblages decreased, whereas the individual mass and the Trophic Diversity Index increased at the highest concentrations. Overall, a numerical negative impact was observed for the epistrate feeders and non-selective deposit feeders, however, this benefited to the omnivores-carnivores, and particularly to the Oncholaimids. Such responses of the nematodes 2B and the corresponding taxa are bioindicative of current- or post-COVID-19 crisis risks in relation with the bioaccumulation of HCQ in seafood.

show abstract

Migratory behavior of free-living marine nematodes surrounded by sediments experimentally contaminated by mixtures of polycyclic aromatic hydrocarbons

Cited by 20 publications

References 22 publications

Ecotoxic response of nematodes to ivermectin, a potential anti-COVID-19 drug treatment

Ecotoxic response of nematodes to ivermectin, a potential anti-COVID-19 drug treatment

Suitability of Free-Living Marine Nematodes as Bioindicators: Status and Future Considerations

Toxicity of hydroxychloroquine, a potential treatment for COVID-19, on free-living marine nematodes

Contact Info

Product

Resources

About