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

Ridall, Aaron; Ingels, Jeroen

doi:10.3389/fmars.2021.685327

Cited by 59 publications

(26 citation statements)

References 159 publications

(184 reference statements)

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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%

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%

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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“…Oligochaetes, in our study, were more abundant in urban shores probably as a consequence of the high concentration of heavy metals and nutrient enrichment in urban shores [42]. Nematodes are also considered good indicators of the environmental status, since they encompass both sensitive and tolerant species to pollution [63]. Our results seem to indicate that the nematode species found in our study should be more sensitive to disturbances, as they were more highly abundant in non-urban shores.…”

Section: Discussionsupporting

confidence: 56%

Differences in the Structure and Diversity of Invertebrate Assemblages Harbored by an Intertidal Ecosystem Engineer between Urban and Non-Urban Shores

Torres

Rubal

Costa-Garcia

et al. 2022

JMSE

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Nowadays, coastal urbanization is one of the most serious and prevalent pressures on marine ecosystems, impacting their biodiversity. The objective of this study was to explore differences in attributes and biodiversity associated with an intertidal ecosystem engineer, the mussel Mytilus galloprovincialis Lamarck, 1819 between urban and non-urban shores. For this, mussel attributes and their associated macrofauna were compared between urban and non-urban rocky shores in the north of Portugal. Results showed that the largest sized mussels were more frequent on urban shores, whereas the smallest size class was only present in non-urban shores. Regarding macrofauna associated with mussels, the number of taxa was significantly higher on non-urban shores. Moreover, the structure of the macrobenhic assemblages was significantly different between urban and non-urban shores. Most important taxa responsible for differences were more abundant on non-urban shores except for Nucella lapillus, Idotea pelagica and Oligochaeta that were more abundant on urban shores. Therefore, our results showed that the mussel size frequency and the structure of the associated macrobenthic assemblages changed in urban shores. Considering the relevance of mussel beds for biodiversity and human well-being, our results indicate the need of adopting proper management plans to minimize these effects on urban intertidal ecosystems.

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“…Nematodes, as important benthic constituents and food sources for many predators, play significant roles in the trophic transfer of pollution from sediments, with some species more susceptible to environmental stressors (Hägerbäumer et al ., 2015). In consequence, nematodes are emerging as bioindicators for freshwater (Hägerbäumer et al ., 2016) and marine pollution (Ridal & Ingels, 2021), in single‐species and community composition tests. Community composition tests require expertise in identifying genera and species, although this can be circumvented by using molecular tools (Avó et al ., 2017; Carta & Li, 2018; Knot et al ., 2020) and automated image recognition apparatus (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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Suitability of Free-Living Marine Nematodes as Bioindicators: Status and Future Considerations

Cited by 59 publications

References 159 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

Differences in the Structure and Diversity of Invertebrate Assemblages Harbored by an Intertidal Ecosystem Engineer between Urban and Non-Urban Shores

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

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