Nontarget effects of a test application of diflubenzuron to the forest canopy on stream macroinvertebrates

Hurd, Martin K.; Perry, Sue A.; Perry, William B.

doi:10.1002/etc.5620150813

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…These different mechanisms of toxicity of these metals may explain the differences observed for their latent toxicity. A similar result on latent effects was found by van der Hurd et al (1996) for macroinvertebrates exposed to diflubenzuron. Brent and Herricks (1998) reported that immobility of Ceriodaphnia dubia continued up to 172 h after a 4 h exposure to Cd and Zn.…”

Section: Discussion Mortalitysupporting

confidence: 86%

Responses of Daphnia magna to pulsed exposures of arsenic

Hoang

Gallagher

Klaine

2007

Environmental Toxicology

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Research on the toxicity of arsenic has focused on sublethal effects that do not provide sufficient information for risk estimation. While most studies have focused on organism response to constant arsenic exposures, organisms in nature are exposed to fluctuating As concentrations. Consequently, results obtained from standardized bioassays with constant exposures may not adequately characterize risk to indigenous biota. This research was designed to characterize the response of Daphnia magna to fluctuating arsenic exposures during 21-day experiments. At concentrations > or =3000 microg/L As, 21-day pulsed exposure mortality increased as a function of exposure concentration and duration. In addition, 21-day pulsed exposure mortality increased with increasing recovery time. Pulsed As exposure did not affect the growth of D. magna over 21 days. Twenty-one day accumulative reproduction of D. magna was only affected by pulsed exposures of high As concentration and long durations.

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Section: Discussion Mortalitysupporting

confidence: 86%

Responses of Daphnia magna to pulsed exposures of arsenic

Hoang

Gallagher

Klaine

2007

Environmental Toxicology

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“…As shown in our results, toxic substances may increase some metrics, for example, primary and secondary production, without enhancing ecosystem attributes. Thus, functional assessments should be carefully applied by setting clear targets of stressors because each macroinvertebrate species may exhibit a different response to toxic substances (Hurd et al 1996;Soucek et al 2001).…”

Section: Functional Metrics and Ecosystem Attributesmentioning

confidence: 99%

Species diversity and functional assessment of macroinvertebrate communities in Austrian rivers

et al. 2006

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We applied an extensive data set from 211 locations along Austrian rivers to assess community structure and the ratios of functional feeding groups of benthic macroinvertebrates. A total of 569 taxa have been identified. At the catchment scale, the Enns, Salzach, and Traun Rivers exhibited the highest taxa richness whereas the Inn River showed the lowest richness. Beta-diversity was highest along the impounded and fragmented Enns and Drau Rivers. Consequently, high corridor diversity corresponded to a low degree of nestedness. Overall, scrapers and gathering-collectors dominated the benthic community. Further, the relationship between habitat conditions and metrics based on functional feeding groups were statistically analyzed to validate the potential of these metrics as indicators of ecosystem attributes. We examined four major ecosystem attributes: species diversity, material cycling, longitudinal material transport, and lateral material input. Multiple regression analyses for midorder rivers demonstrated that metrics were significantly related to habitat conditions. For example, the metric set indicating primary production was positively correlated with periphyton cover, dissolved oxygen, dominant sediment size, and average annual discharge. Overall, most metrics exhibited unique responses to habitat conditions, implying that they are useful proxies of ecosystem attributes. Thus, a functionbased approach based on macroinvertebrates has the potential to become an effective tool for the assessment of river ecosystems.

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“…Postexposure, latent, or delayed effects occur after a typical study is terminated. This may be an important factor in the interpretation of toxicity studies and in risk assessment for agrochemicals [12]. Ecological recovery may occur after an exposure that affects a significant proportion of the population.…”

Section: Potential Consequences Of a Time-varying Or Pulsed Exposurementioning

confidence: 99%

Effects analysis of time‐varying or repeated exposures in aquatic ecological risk assessment of agrochemicals

Reinert

Giddings²,

Judd

2002

Enviro Toxic and Chemistry

174

149

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Exposure to agrochemicals in the aquatic environment often occurs as time-varying or repeated pulses. Time-varying exposures may occur due to runoff events and spray drift associated with precipitation and application events. Hydrologic dilution, dispersion, and degradation also produce pulsed exposures. Standard laboratory toxicity tests using constant exposure concentrations typically do not investigate the toxicity of time-varying or repeated exposures. Detoxification, elimination, and recovery may occur within organisms or populations during the periods between exposures. The difficulty of estimating effects of realistic time-varying exposures from measurements made under constant exposure conditions is often an important source of uncertainty in ecological risk assessment of pesticides. This article discusses the criteria and tools for deciding whether time-varying exposures are relevant in a particular risk assessment, approaches for laboratory toxicity testing with time-varying exposure, modeling approaches for addressing effects oftime-varying exposure, deterministic and probabilistic ecological risk characterization of time-varyingexposures and toxicity, and uncertainty analysis.

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Nontarget effects of a test application of diflubenzuron to the forest canopy on stream macroinvertebrates

Cited by 25 publications

References 21 publications

Responses of Daphnia magna to pulsed exposures of arsenic

Responses of Daphnia magna to pulsed exposures of arsenic

Species diversity and functional assessment of macroinvertebrate communities in Austrian rivers

Effects analysis of time‐varying or repeated exposures in aquatic ecological risk assessment of agrochemicals

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