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Ralf Schulz
University of Koblenz and Landau
276Publications
48H-index
7,213Citations
Publications 282
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Regulatory threshold levels (RTL) represent robust benchmarks for assessing risks of pesticides, e.g., in surface waters. However, comprehensive scientific risk evaluations comparing RTL to measured environmental concentrations (MEC) of pesticides in surface waters were yet restricted to a low number of pesticides, as RTL are only available after extensive review of regulatory documents. Thus, the aim of the present study was to model RTL equivalents (RTLe) for aquatic organisms from publicly ac...
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#1Patrick Baudy (University of Koblenz and Landau)H-Index: 3
#2Jochen P. Zubrod (University of Koblenz and Landau)H-Index: 16
Last.Mirco Bundschuh (SLU: Swedish University of Agricultural Sciences)H-Index: 28
view all 7 authors...
Abstract Aquatic hyphomycetes (AH) are ubiquitous fungi playing a key role in the decomposition of leaf litter in streams. Though their functional performance is modulated by their community composition, this ecological relationship remains poorly investigated due to a lack of suitable methods to identify the biomass-contribution of individual species to AH communities. We, therefore, designed and validated TaqMan® probe-based qPCR assays targeting ten AH species common in temperate regions, all...
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#1Mirco Bundschuh (SLU: Swedish University of Agricultural Sciences)H-Index: 28
#2Dominic EnglertH-Index: 11
Last.Ralf SchulzH-Index: 48
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Nanoparticle contaminants enter aquatic ecosystems and are transported along the stream network. Here, we demonstrate a novel pathway for the return of nanoparticles from aquatic to terrestrial ecosystems via cross-boundary subsidies. During their emergence, trichopteran caddisflies carried titanium dioxide and gold nanoparticles into their terrestrial life stages. Moreover, their emergence was delayed by ≤30 days, and their energy reserves were depleted by ≤25%. Based on worst case estimates, i...
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#1Sebastian Stehle (University of Koblenz and Landau)H-Index: 7
#2Abigail Bline (UCLA: University of California, Los Angeles)
Last.Ralf Schulz (University of Koblenz and Landau)H-Index: 48
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Abstract Non-agricultural uses of pesticides are common in the U.S. and may thus lead to exposure of non-target ecosystems such as urban waterways. However, surface water exposure resulting from agricultural pesticide uses has received substantially more attention during the last decades. Here we conducted a literature review and meta-analysis of peer-reviewed studies to identify measured environmental concentrations (MEC) of pesticides in perennial surface water bodies due to non-agricultural u...
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The aquatic Environmental Risk Assessment (ERA) for pesticides relies on standardized experimental protocols focusing on exposure via the water phase or the sediment. Systemic pesticides (e.g., neonicotinoids) or pesticides produced in transgenic plants (e.g., Bt proteins) can be introduced into aquatic ecosystems as part of plant residues. Consequently, they may be taken up by organisms as part of their diet. Here, we analyzed (i) whether standardized aquatic ecotoxicological test guidelines co...
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#1Jiachen Sun (University of Antwerp)H-Index: 3
#2Rossana BossiH-Index: 32
Last.Igor EulaersH-Index: 16
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We reconstructed the first long-term (1968–2015) spatiotemporal trends of perfluoroalkyl substances (PFAS) using archived body feathers of white-tailed eagles (Haliaeetus albicilla) from the West Greenland (n = 31), Norwegian (n = 66), and Central Swedish Baltic coasts (n = 50). We observed significant temporal trends of perfluorooctane sulfonamide (FOSA), perfluorooctane sulfonate (PFOS), and perfluoroalkyl carboxylates (∑PFCAs) in all three subpopulations. Concentrations of FOSA and PFOS had s...
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#1Maj Wetjen (University of Koblenz and Landau)H-Index: 2
#2Thomas Schmidt (University of Koblenz and Landau)H-Index: 2
Last.Ralf Schulz (University of Koblenz and Landau)H-Index: 48
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#1Jakob Wolfram (University of Koblenz and Landau)H-Index: 3
#2Sebastian Stehle (University of Koblenz and Landau)H-Index: 7
Last.Ralf Schulz (University of Koblenz and Landau)H-Index: 48
view all 5 authors...
Although pesticide contamination in agricultural surface waters is a common phenomenon, large-scale studies dealing with the responsible drivers are rare. We used data from 259 publications reporting 5830 individual water or sediment concentrations of 32 insecticides and their metabolites in 644 US surface waters to determine the factors driving insecticide risks, that is, exceedance of regulatory threshold levels (RTLs). Multiple linear regressions (R2 adj. = 49.6–76.5) revealed that toxicity-n...
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#1Jiachen Sun (University of Antwerp)H-Index: 3
#2Jan Ove BustnesH-Index: 33
Last.Igor Eulaers (AU: Aarhus University)H-Index: 16
view all 17 authors...
Abstract The spatiotemporal trends of mercury (Hg) are crucial for the understanding of this ubiquitous and toxic contaminant. However, uncertainties often arise from comparison among studies using different species, analytical and statistical methods. The long-term temporal trends of Hg exposure were reconstructed for a key sentinel species, the white-tailed eagle (Haliaeetus albicilla). Body feathers were sampled from museum collections covering 150 years in time (from 1866 to 2015) from West ...
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