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Experimental Studies with Nematodes in Ecotoxicology: an Overview

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Experimental Studies with Nematodes in Ecotoxicology: an Overview Journal of Nematology 47(1):11–27. 2015. Ó The Society of Nematologists 2015. Experimental Studies with Nematodes in Ecotoxicology: An Overview 1 2 3 1 ARNE HA¨ GERBA¨ UMER, SEBASTIAN HO¨ SS, PETER HEININGER, AND WALTER TRAUNSPURGER Abstract: With respect to their high abundances, their role as intermediaries between microorganisms and higher trophic levels, and their ubiquitous occurrence in all habitats, nematodes are of strong potential interest as environmental indicators. Ecotox- icological methods to evaluate the risk of anthropogenic pollutants on ecosystems require both in vitro and in vivo toxicity tests to investigate either mechanisms or pathways of toxicity and to set accurate toxicity thresholds. For this, the interest in nematodes as model organisms in ecotoxicology increased over the past few decades and existing appropriate experimental methods are reviewed in this manuscript. An overview of the various existing ecotoxicological tools for nematodes, ranging from molecular laboratory methods to experimental model ecosystem approaches, and their role as indicator organisms is given. The reviewed studies, ap- proaches that range from species-based to community-based methods, reveal exciting possibilities for the future use of nematodes in ecotoxicological studies. Suitable ecotoxicological tools and ecological indices for nematodes should be integrated in weight-of- evidence approaches for assessing the ecological risk of contamination. Key words: chemicals, contamination, ecology, ecotoxicology, free-living, freshwater, marine, methods, microcosms, model ecosystems, molecular, NemaSPEAR[%] index, review, single species, soil. Due to their high ecological relevance in freshwater, EFSA, 2013). To refine toxicity thresholds (and reduce marine, and terrestrial habitats, nematodes are of safety risks), higher-tier testing is required (Boxall et al., strong potential interest as environmental indicators 2002). This can be achieved using (i) chronic toxicity (Wilson and Kakouli-Duarte, 2009). Two symposia on endpoints (e.g., reproduction), (ii) realistic exposure ‘‘Nematodes as Environmental Bioindicators’’ 2007 in scenarios (e.g., sediments for scarcely soluble sub- Edinburgh (United Kingdom) and 2012 in Gent stances), or (iii) ecologically more relevant multispecies (Belgium) helped to open avenues of communication test systems (model ecosystems), such as microsomes or between various scientists and stakeholders. In general, mesocosms. Regulatory authorities have to rely on en- the interest in nematodes in the field of ecotoxicology vironmentally safe thresholds for chemicals in the is growing. If searching for the terms ‘‘nematode*’’ process of chemical authorization and restriction of AND ‘‘ecotoxicology’’ in Google Scholar, the number of their release in the environment (e.g., European Reg- hits increased 10-fold within the last 20 years (which is ulation, Evaluation and Authorization of Chemicals above average of the overall increase in ecotoxico- [REACH]). In retrospective risk assessments, the eco- logical papers). A considerable part (25%) of these logical status or quality of an ecosystem is assessed by papers on nematodes describes studies with the model evaluating the in situ fauna or flora (WFD; European nematode Caenorhabditis elegans. Community, 2000). Here, indicator systems can help to Ecotoxicological methods to evaluate the risk of an- identify habitats with poor ecological status and to link thropogenic pollutants on ecosystems, must (i) assess this status to the presence of chemical pollution or the toxicity of single chemicals or chemical mixtures in other types of stress, including hydromorphological water, sediment, and soil (European Commision, 2003; modifications and climate change (e.g., Von der Ohe ECHA, 2008; EFSA, 2013) and (ii) evaluate the eco- et al., 2007; Von der Ohe and Goedkoop, 2013). Ap- logical status or quality of certain ecosystem compart- propriate actions to improve the ecological status of ments, such as soil or sediments that are potentially ecosystems (as mandated by the European Union WFD) exposed to pollution (European Water Framework Di- can only be taken if the causes of the deleterious effects rective [WFD]) (European Community, 2000). A pro- on the ecosystem are known (De Zwart et al., 2009). spective risk assessment requires both in vitro and in For all these challenges in ecotoxicology (or applied vivo toxicity tests to investigate mechanisms of toxicity ecology), there exist appropriate experimental methods and to set accurate toxicity thresholds, such as NOEC that use nematodes as a model or indicator organism. (no observed effect concentrations) and EC10 (the These methods are reviewed in this manuscript. Al- concentration at which 10% of the total effect occurs) though many studies have examined the effects of for regulatory purposes (European Commision, 2003; chemicals on a single species (mainly using C. elegans), much less is known about the ecotoxicological impact on nematodes in multispecies set-ups or at the community Received for publication December 5, 2014. 1Department of Animal Ecology, University of Bielefeld, Konsequenz 45, level. Here, we provide an overview of the various eco- 33615 Bielefeld, Germany. toxicological tools that already exist for nematodes, 2Ecossa, Giselastr. 6, 82319 Starnberg, Germany. 3German Federal Institute of Hydrology, Mainzer Tor 1, 56968 Koblenz, ranging from molecular laboratory methods to experi- Germany. mental model ecosystem approaches (Fig. 1). This re- We are grateful to the German Federal Institute of Hydrology (BfG), which funded the preparation of this review as part of the project ‘‘Validation of the view is divided into two parts: (i) the first part gives an NemaSPEAR[%] index based on field studies and laboratory experiments’’ overview of laboratory methods that were applied to (project no. M39620004003). E-mail: [email protected] study effects of chemicals on a single nematode species, This paper was edited by Jyotsna Sharma. as listed in Table 1. Due to the vast number of studies 11 12 Journal of Nematology, Volume 47, No. 1, March 2015 FIG. 1. Ecotoxicological methods at different organizational and ecological levels that can be applied using nematodes as test or indicator organisms. Omics stands for genomics, transcriptomics, proteomics, metabolomics. GFP = green fluorescent protein, DEB-Tox = dynamic energy budget theory applied to toxicological issues; NemaSPEAR = nematode species at risk. with C. elegans in, e.g., medical research, this section is various nematode species, mainly bacterial feeders, not claiming completeness. However, the reader can have been used for testing the toxicity of chemicals and find a comprehensive compilation of examples for im- environmental samples (e.g., C. elegans, Panagrellus portant environmental chemicals and links for continu- redivivus, Plectus acuminatus, Monhystera disjuncta). Apart ative reviews on specific topics; (ii) the second part gives from C. elegans, which is by far the most commonly used an overview of relevant studies on effects of chemicals nematode in single-species testing, various other soil on free-living nematode communities in experimental and marine nematode species have been employed to set-ups (model ecosystems). A comprehensive literature assess the toxicity of (i) toxic compounds, such as heavy research was carried out in ISI Web of Science using the metals, pesticides, and pharmaceuticals, and (ii) con- search term ‘‘nematode*’’ AND ‘‘ecotoxicology’’ AND taminated natural samples (Table 1). (‘‘microcosm*’’ OR ‘‘mesocosm*’’), revealing more Due to the nearly ideal qualities of C. elegans as than 2000 hits. Based on this pool, studies dealing with a model organism in genetics, developmental biology, community assessment parameters of free-living nem- and medical biochemistry (e.g. easy culture, simple atodes, as listed in Table 2, were categorized as relevant body plan, and short generation and life cycle), the for our field of interest and reviewed, whereas publi- effects of chemicals on this nematode species at various cations concerning other fields of research, e.g., studies organizational levels (molecular, organs, whole organ- on genetic and metabolomic responses to chemicals as ism, and population) have already been described. well as applications with parasitic nematodes as con- Therefore, many molecular and biomedical methods sidered organisms, were excluded (NOT ‘‘gen*’’ or exist for C. elegans that could be exploited for ecotox- ‘‘metabolom*’’ or ‘‘parasit*’’). The yielded ecotoxico- icological purposes (for reviews see, e.g., Kaletta and logical microcosm studies were screened on the use of Hengartner, 2006; Menzel et al., 2009a; Hulme and a representative (nematode) community, an adequate Whitesides, 2011). Also, for whole-organism toxicity description of the experimental set-up, and reported testing the most mature and standardized test systems exposure concentrations of the used chemicals. Beside are those developed for C. elegans (ASTM E2172-01: the mentioned nematode community assessment pa- ASTM, 2001; ISO 10872: ISO, 2010; for reviews see, e.g., rameters, tested chemicals, type of microcosm, dura- Leung et al., 2008; Hoss€ and Williams, 2009; Muschiol tion, and extraction methods were recorded (Table 2). et al., 2009). Effects at the molecular level: C. elegans is one of the most LABORATORY ECOTOXICOLOGICAL METHODS WITH A important nonmammalian model organisms, besides SINGLE SPECIES Escherichia coli, Saccharomyces
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