Nematode community structure in relation to metals in the southern of Caspian Sea

Bastami, Kazem Darvish; Taheri, Mehrshad; Foshtomi, Maryam Yazdani; Haghparast, Sarah; Hamzehpour, Ali; Bagheri, Hossein; Esmaeilzadeh, Marjan; Molamohyeddin, Neda

doi:10.1007/s13131-017-1051-x

Cited by 6 publications

(4 citation statements)

References 51 publications

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“…Generally, studies on how metal pollution affects nematode assemblage composition report lower species diversity and lower abundances of community members (Nasira et al, 2010;Sedano et al, 2014;Bastami et al, 2017;Ridall and Ingels, 2021). This is also evident in the present study: nematode density as well as diversity of the nematode community were significantly lower in the iron-enriched sediments compared to the visually unaffected sediments.…”

Section: Nematode Assemblages Along the Iron Gradientsupporting

confidence: 80%

“…Some species, such as Enoplus communis, show low tolerance to metals (Howell, 1983), while others, such as Diplolaimella dievengatensis and Halomonhystera disjuncta (Vranken and Heip, 1986;Vranken et al, 1991;Gyedu-Ababio and Baird, 2006) can be tolerant to high levels of heavy metals (Zeppilli et al, 2015). Large-scale observations (at hundreds of meters and kilometers) assessing nematode community compositions influenced by multiple metal pollutants have shown that shifting meiobenthic compositions may indicate the presence of metal-tolerant as well as metal-intolerant nematode species (Bastami et al, 2017;Stark et al, 2020).…”

Section: Nematode Assemblages Along the Iron Gradientmentioning

confidence: 99%

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Impact of local iron enrichment on the small benthic biota in the deep Arctic Ocean

Soltwedel

Rapp²,

Hasemann³

2023

Front. Mar. Sci.

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This study assesses the impact of local iron enrichment on the small benthic biota (bacteria, meiofauna) at the deep seafloor. To evaluate the hypothesis that abundance, distribution, and diversity of the small benthic biota varies in relation to a local input of structural steel at the seabed, we analyzed sediment samples and the associated infauna along a short transect (~1.5 m in length) with increasing distance to an iron source, i.e., corroding steel weights (30 cm in length and width, and 6 cm in height) of a free-falling observational platform (bottom-lander), lying on the seafloor for approximately seven years. Bacterial and meiofaunal densities and biomasses in iron-enriched sediments were significantly lower than those in unaffected sediments. Moreover, bacterial and nematode community structure between iron-enriched sediments and unaffected sediments differed strongly; taxonomic richness as well as diversity was lowest closest to the iron source. The presence of iron fostered the establishment of specialized iron oxidizers and other chemolithoautotrophic bacterial members, which were rare or absent in the unaffected sediments, within which opportunistic heterotrophs predominated. Nematodes comprised >90% of the total metazoan meiofauna and were therefore studied in more detail. A total of 26 genera from 16 families occurred in iron-enriched sediments (three genera were found exclusively in these sediments), while 65 genera from 27 families occurred in the unaffected sediments (39 genera and 12 families were found exclusively in these sediments). Nematode genera number (S), estimated genera richness (EG(51)) and heterogeneity (H’(log2)) were significantly lower in iron-enriched sediments than in unaffected sediments. Our results confirm that the local enrichment of deep-sea sediments by metallic and corroding structures (e.g., by ship hulls, containers, scientific equipment) strongly affects the diversity of the small benthic biota at short distances from these sources.

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Section: Nematode Assemblages Along the Iron Gradientsupporting

confidence: 80%

Section: Nematode Assemblages Along the Iron Gradientmentioning

confidence: 99%

Impact of local iron enrichment on the small benthic biota in the deep Arctic Ocean

Soltwedel

Rapp²,

Hasemann³

2023

Front. Mar. Sci.

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“…Similarly, Nasira et al (2010) demonstrated that high levels of mercury in the Arabian sea led to the highest nematode abundance among sampling sites. Large-scale works assessing nematode community compositions influenced by multiple metal pollutants have shown that shifting meiobenthic compositions may indicate the presence of metaltolerant as well as metal-intolerant nematode species (Bastami et al, 2017;Stark et al, 2020). In general, studies on how metal pollution affects nematode assemblage composition report lower species diversity and lower abundances of community members and suggest the need for future work to assess which species are tolerant to specific heavy metals (Nasira et al, 2010;Sedano et al, 2014;Bastami et al, 2017).…”

Section: Nematodes As Indicators Of Heavy Metal Pollutionmentioning

confidence: 99%

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

Ridall

Ingels

2021

Front. Mar. Sci.

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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.

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“…Most ecological research on nematodes as bioindicators in the marine environment has focused on their responses to heavy metals, hydrocarbons, and organic enrichment (Ridal & Ingels, 2021). Studies have demonstrated species‐specific susceptibility to different metals and changes in the diversity and abundance of some species in response to heavy metal pollution (Bastami et al ., 2017). Nematode genera have shown differential tolerance to oil spills and PAHs, with some demonstrating tolerance (e.g.…”

Section: Key Aquatic Invertebrates In Standardised Aquatic Ecotoxicol...mentioning

confidence: 99%

A broad‐taxa approach as an important concept in ecotoxicological studies and pollution monitoring

Rosner,

Ballarin,

Barnay‐Verdier

et al. 2023

Biological Reviews

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Aquatic invertebrates play a pivotal role in (eco)toxicological assessments because they offer ethical, cost‐effective and repeatable testing options. Additionally, their significance in the food chain and their ability to represent diverse aquatic ecosystems make them valuable subjects for (eco)toxicological studies. To ensure consistency and comparability across studies, international (eco)toxicology guidelines have been used to establish standardised methods and protocols for data collection, analysis and interpretation. However, the current standardised protocols primarily focus on a limited number of aquatic invertebrate species, mainly from Arthropoda, Mollusca and Annelida. These protocols are suitable for basic toxicity screening, effectively assessing the immediate and severe effects of toxic substances on organisms. For more comprehensive and ecologically relevant assessments, particularly those addressing long‐term effects and ecosystem‐wide impacts, we recommended the use of a broader diversity of species, since the present choice of taxa exacerbates the limited scope of basic ecotoxicological studies.This review provides a comprehensive overview of (eco)toxicological studies, focusing on major aquatic invertebrate taxa and how they are used to assess the impact of chemicals in diverse aquatic environments. The present work supports the use of a broad‐taxa approach in basic environmental assessments, as it better represents the natural populations inhabiting various ecosystems. Advances in omics and other biochemical and computational techniques make the broad‐taxa approach more feasible, enabling mechanistic studies on non‐model organisms. By combining these approaches with in vitro techniques together with the broad‐taxa approach, researchers can gain insights into less‐explored impacts of pollution, such as changes in population diversity, the development of tolerance and transgenerational inheritance of pollution responses, the impact on organism phenotypic plasticity, biological invasion outcomes, social behaviour changes, metabolome changes, regeneration phenomena, disease susceptibility and tissue pathologies. This review also emphasises the need for harmonised data‐reporting standards and minimum annotation checklists to ensure that research results are findable, accessible, interoperable and reusable (FAIR), maximising the use and reusability of data. The ultimate goal is to encourage integrated and holistic problem‐focused collaboration between diverse scientific disciplines, international standardisation organisations and decision‐making bodies, with a focus on transdisciplinary knowledge co‐production for the One‐Health approach.

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Nematode community structure in relation to metals in the southern of Caspian Sea

Cited by 6 publications

References 51 publications

Impact of local iron enrichment on the small benthic biota in the deep Arctic Ocean

Impact of local iron enrichment on the small benthic biota in the deep Arctic Ocean

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

A broad‐taxa approach as an important concept in ecotoxicological studies and pollution monitoring

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