Secondary production of a zoobenthic community under metal stress

Faupel, Michael; Traunspurger, Walter

doi:10.1016/j.watres.2012.03.052

Cited by 13 publications

(3 citation statements)

References 29 publications

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“…setifera indicated the increased abundance of this omnivorous species in the treated microcosms, whereas bacterial feeding species of the genus Eumonhystera ( E. vulgaris , E. pseudobulbosa , and E. longicaudatula ) had negative scores (Figure ). These findings are in accordance with the results of other microcosm experiments in which the effects of cadmium and ivermectin on nematode communities were investigated . Thus, the chemically induced shift from bacterivor‐dominated to predator and omnivore–dominated nematode communities (Table ) seems to be a general response to chemical stress, rather than a specific response to Zn.…”

Section: Discussionsupporting

confidence: 89%

A comparative approach using ecotoxicological methods from single‐species bioassays to model ecosystems

Haegerbaeumer

Höss²,

Ristau³

et al. 2016

Enviro Toxic and Chemistry

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Soft sediments are often hotspots of chemical contamination, and a thorough ecotoxicological assessment of this habitat can help to identify the causes of stress and to improve the health of the respective ecosystems. As an important component of the ecologically relevant meiobenthic fauna, nematodes can be used for sediment assessments, with various assay tools ranging from single-species toxicity tests to field studies. In the present study, microcosms containing sediment were used to investigate direct and indirect effects of zinc on natural nematode assemblages, and acute community toxicity tests considering only direct toxicity were conducted. The responses of the various freshwater nematode species in both approaches were compared with those of Caenorhabditis elegans, determined in standardized tests (ISO 10872). At a median lethal concentration (LC50) of 20 mg Zn/L, C. elegans represented the median susceptibility of 15 examined nematode species examined in the acute community toxicity tests. In the microcosms, Zn affected the nematodes dose-dependently, with changes in species composition first detected at 13 mg Zn/kg to 19 mg Zn/kg sediment dry weight. The observed species sensitivities in the microcosms corresponded better to field observations than to the results of the acute community toxicity tests. Environ Toxicol Chem 2016;35:2987-2997. © 2016 SETAC.

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Section: Discussionsupporting

confidence: 89%

A comparative approach using ecotoxicological methods from single‐species bioassays to model ecosystems

Haegerbaeumer

Höss²,

Ristau³

et al. 2016

Enviro Toxic and Chemistry

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“…Feeding habit, generation time, and sensitivity to environmental disturbance allow the designation of functional feeding guilds of different nematode taxa with similar response characteristics (Bongers & Ferris, 1999;Ferris & Bongers, 2006). However, nematodes have variable responses to stress factors; some species are extremely sensitive to pollutants and others extremely tolerant (Faupel & Traunspurger, 2012;Ferris, Bongers, & De Goede, 2004;Höss et al, 2011;Korthals et al, 1996;Tenuta & Ferris, 2004). Also, being nematodes low-mobility organisms, the use of nematodes as bioindicators is often based on the different colonization capabilities of the nematode families.…”

Section: Discussionmentioning

confidence: 99%

Nematode distributions as spatial null models for macroinvertebrate species richness across environmental gradients: A case from mountain lakes

Mendoza

Traunspurger

Palomo

et al. 2017

Ecology and Evolution

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Nematode species are widely tolerant of environmental conditions and disperse passively. Therefore, the species richness distribution in this group might largely depend on the topological distribution of the habitats and main aerial and aquatic dispersal pathways connecting them. If so, the nematode species richness distributions may serve as null models for evaluating that of other groups more affected by environmental gradients. We investigated this hypothesis in lakes across an altitudinal gradient in the Pyrenees. We compared the altitudinal distribution, environmental tolerance, and species richness, of nematodes with that of three other invertebrate groups collected during the same sampling: oligochaetes, chironomids, and nonchironomid insects. We tested the altitudinal bias in distributions with t‐tests and the significance of narrow‐ranging altitudinal distributions with randomizations. We compared results between groups with Fisher's exact tests. We then explored the influence of environmental factors on species assemblages in all groups with redundancy analysis (RDA), using 28 environmental variables. And, finally, we analyzed species richness patterns across altitude with simple linear and quadratic regressions. Nematode species were rarely biased from random distributions (5% of species) in contrast with other groups (35%, 47%, and 50%, respectively). The altitudinal bias most often shifted toward low altitudes (85% of biased species). Nematodes showed a lower portion of narrow‐ranging species than any other group, and differed significantly from nonchironomid insects (10% and 43%, respectively). Environmental variables barely explained nematode assemblages (RDA adjusted R2 = 0.02), in contrast with other groups (0.13, 0.19 and 0.24). Despite these substantial differences in the response to environmental factors, species richness across altitude was unimodal, peaking at mid elevations, in all groups. This similarity indicates that the spatial distribution of lakes across altitude is a primary driver of invertebrate richness. Provided that nematodes are ubiquitous, their distribution offers potential null models to investigate species richness across environmental gradients in other ecosystem types and biogeographic regions.

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“…Moreover, simultaneous consideration of the influence of anthropogenic chemicals on bacteria and meiofauna can provide much more relevant insights into ecosystem disturbances than obtained from assessing distinct effects on model organisms or trophic levels. Nonetheless, there are few studies linking bacterial and meiofaunal communities in the same freshwater microcosm . In marine microcosms, Louati et al showed that under nutrient‐limited conditions bacterial communities respond more strongly to the presence of meiofauna than to PAH contamination, whereas meiofauna are distinctly disturbed by PAHs.…”

Section: Introductionmentioning

confidence: 99%

Response of bacteria and meiofauna to iron oxide colloids in sediments of freshwater microcosms

Höss¹,

Frank-Fahle

Lueders

et al. 2015

Enviro Toxic and Chemistry

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The use of colloidal iron oxide (FeOx) in the bioremediation of groundwater contamination implies its increasing release into the environment and requires an assessment of its ecotoxicological risk. Therefore, microcosm experiments were carried out to investigate the impact of ferrihydrite colloids on the bacterial and meiofaunal communities of pristine freshwater sediments. The effects of ferrihydrite colloids were compared with those of ferrihydrite macroaggregates to discriminate between colloid-specific and general FeOx impacts. The influence of ferrihydrite colloids on the toxicity of sediment-bound fluoranthene was also considered. At high concentrations (496 mg Fe kg(-1) sediment dry wt), ferrihydrite colloids had a significant, but transient impact on bacterial and meiofaunal communities. Although bacterial community composition specifically responded to ferrihydrite colloids, a more general FeOx effect was observed for meiofauna. Bacterial activity responded most sensitively (already at 55 mg Fe kg(-1) dry wt) without the potential of recovery. Ferrihydrite colloids did not influence the toxicity of sediment-bound fluoranthene. Significant correlations between bacterial activity and meiofaunal abundances were indicative of trophic interactions between bacteria and meiofauna and therefore of the contribution of indirect food web effects to the observed impacts. The results suggest that the application of ferrihydrite colloids for remediation purposes in the field poses no risk for benthic communities, given that, with the exception of generic bacterial activity, any negative effects on communities were reversible.

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Secondary production of a zoobenthic community under metal stress

Cited by 13 publications

References 29 publications

A comparative approach using ecotoxicological methods from single‐species bioassays to model ecosystems

A comparative approach using ecotoxicological methods from single‐species bioassays to model ecosystems

Nematode distributions as spatial null models for macroinvertebrate species richness across environmental gradients: A case from mountain lakes

Response of bacteria and meiofauna to iron oxide colloids in sediments of freshwater microcosms

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