Strain difference in sensitivity to 3,4-dichloroaniline and insect growth regulator, fenoxycarb, in Daphnia magna

Oda, Shigeto; Tatarazako, Norihisa; Dorgerloh, Michael; Johnson, Rodney D.; Kusk, Kresten Ole; Leverett, Dean; Marchini, Silvia; Nakari, Tarja; Williams, Tim D.; Iguchi, Taisen

doi:10.1016/j.ecoenv.2006.12.010

Cited by 40 publications

(33 citation statements)

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“…Also, daphniid performance to the reference toxicants DCA and potassium dichromate [Cr(VI)] showed that Daphnia health status and sensitivity were similar among media. For the latter two toxicants, D. magna sensitivity was found to be within the range (Cr 48-h EC 50 , 100-288 lg L -1 ; DCA 48-h EC 50 , 100-640 lg L -1 ) usually reported in the literature (Baird et al 1991;Guilhermino et al 1997Guilhermino et al , 2000Oda et al 2007). Unlike DCA and Cr, we found large variation in the acute toxicity for Cu and Cd.…”

Section: Discussioncontrasting

confidence: 38%

Performance of standard media in toxicological assessments with Daphnia magna: chelators and ionic composition versus metal toxicity

et al. 2010

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Fully artificial test media can increase reproducibility and standardization in ecotoxicological assessments, but there is still a lack of convergence among ecotoxicology laboratories in aquatic test media with respect to ionic composition, chelators, and organic supplements. We compared the performance of Daphnia magna in three widely-used reconstituted media. The tested media differed in composition: (a) ADaM, an artificial medium based in a synthetic sea salt, with no a priori known chelating properties; (b) ASTM hard water supplemented with algal extract, a semi-artificial medium with unknown chelating properties; and (c) M7, a complex artificial medium containing EDTA as a chelator. All three media were suitable for rearing D. magna (although performance in M7 was suboptimal) and acute EC(50) values for reference substances (3,4-DCA, K(2)Cr(2)O(7)) were similar between media. In acute exposures to Cu and Cd, daphniids were least sensitive when reared in M7, as expected due to metal chelation by EDTA. Daphnia sensitivity to Cd was low in ADaM. Thus, these two media were suboptimal for assessing the toxicity of some metals to D. magna in acute tests. We suggest that both the ionic composition of the medium and the presence of chelators should be taken into account when metal toxicity is concerned. Chronic toxicity profiles for Cu suggested a mild chelating effect of the algal extract in ASTM medium. Still, ASTM hard water persists as one of the most suitable media for acute toxicity assessments of metals and metal-contaminated samples.

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Section: Discussioncontrasting

confidence: 38%

Performance of standard media in toxicological assessments with Daphnia magna: chelators and ionic composition versus metal toxicity

et al. 2010

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“…Genetic variability in response to stressors has been frequently observed, both among and within populations (Barata et al 2002;Oda et al 2006Oda et al , 2007. Oda et al (2007), for example, reported a variation in estimated EC 50 values for fenoxycarb by a factor of four, between seven strains of D. magna from different laboratories. Since dormant eggs are produced by sexual reproduction, each individual hatchling represents a different clone and may reveal somewhat different characteristics and tolerances.…”

Section: Impact Of Pesticides On Hatching Growth and Reproductionmentioning

confidence: 99%

“…Carbaryl is a carbamate insecticide with neurotoxic activity, causing overstimulation of the nervous system (Walker et al 2001). Fenoxycarb, on the other hand, is a juvenile hormone analogue and a very potent methyl farnesoate agonist (Tatarazako et al 2003;Oda et al 2005;Wang et al 2005) that is able to induce the production of male neonates in D. magna at concentrations as low as 100 ng/L (Tatarazako and Oda 2007). Fenoxycarb can also disrupt ecdysteriod-regulated aspects of embryo development in parthenogenetic eggs, but at levels 10 times higher compared to effects on offspring sex ratio (Mu and LeBlanc 2004).…”

Section: Impact Of Pesticides On Hatching Growth and Reproductionmentioning

confidence: 99%

“…Carbaryl is a carbamate insecticide, which causes overstimulation of the nervous system by binding to acetylcholine esterase (Walker et al 2001), and has a very high acute toxicity for crustaceans (EFSA 2006). Fenoxycarb, on the other hand, is an insect growth regulator, which is known to disturb the endocrine system in crustaceans (LeBlanc 2007), by changing offspring sex ratio (Tatarazako and Oda 2007) and causing developmental malformations in parthenogenetic eggs (Mu and LeBlanc 2004). Our working hypothesis is that exposure to pesticides, if it coincides with incubation under optimal hatching conditions, might impact embryonic development and hatching rate of the dormant eggs, as well as life history characteristics of the hatched neonates.…”

Section: Introductionmentioning

confidence: 99%

“…1, number 4) (Barata et al 2007;Hassold and Backhaus 2009;Jansen et al 2011); (iv) change offspring sex ratio (Fig. 1, number 5) (Dodson et al 1999;Olmstead and LeBlanc 2003;Tatarazako and Oda 2007;Palma et al 2009);and (v) affect timing and amount of dormant egg production (Fig. 1, number 6) (Shurin and Dodson 1997;Olmstead and LeBlanc 2001;Ignace et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Pesticide exposure impacts not only hatching of dormant eggs, but also hatchling survival and performance in the water flea Daphnia magna

et al. 2013

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Laboratory ecotoxicity tests and biomonitoring in aquatic systems are currently based on the active component of invertebrate communities. Even though dormant egg banks are crucial for the long term survival and community dynamics of many aquatic organisms, the effects of anthropogenic activities on dormant egg bank dynamics have rarely been studied. In this study we investigated the effects of two pesticides with a different mode of action (carbaryl and fenoxycarb) on hatching of Daphnia magna dormant eggs (ephippia) as well as on survival, growth and reproduction of the hatched neonates. Dormant eggs were exposed to the pesticides simultaneously to incubation under conditions that induce hatching (long daylight and 20°C). Carbaryl had no negative effects on embryonic development or hatching rate up to concentrations almost 1,000 times the median effect concentration (EC 50 ) of neonate survival in acute tests. Fenoxycarb, however, had a significant dose-related effect by delaying or completely stopping the hatching process and caused severe abnormalities in developing individuals. Both pesticides had significant negative effects on survival and reproduction of the hatchlings. These results indicate that, in addition to inducing mortality of active individuals, pesticides can affect zooplankton communities by altering hatching dynamics and life history traits of hatched individuals. We briefly discuss how such pollution induced changes in the benthic-pelagic coupling could translate into transgenerational effects impacting ecological and evolutionary dynamics.

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Age and Synchronization of Daphnia magna Affect Sensitivity to Teflubenzuron in Acute Standardized Toxicity Tests

Schmid

Rundberget

Shang

et al. 2023

Enviro Toxic and Chemistry

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The standard Daphnia sp. acute toxicity test for assessing the adverse effects of chemicals on aquatic invertebrates stipulates the use of neonates that are ≤24 h old (hours post release [hpr]) at the start of the exposure. However, when one is assessing acute effects of chemicals interfering with endocrine relevant-processes such as molting, both age synchronization and absolute age can influence the test outcome, because the occurrence of molting and associated mortality is highly time specific. Hence, a 24-h age synchronization window may mask the real effects of these compounds. To explore the influence of age synchronization and absolute age in standard acute toxicity tests, we exposed D. magna from different synchronization windows and absolute ages (≤4, 4-8, 8-12, ≤12, and ≤24 hpr at the beginning of the exposure) to 0.5-12 µg/L of the chitin synthesis inhibitor (CSI) teflubenzuron (TEF) using the Organisation for Economic Co-operation and Development test guideline 202 (Daphnia sp. 48 h immobilization test). Our results show significant differences in 48-h median lethal concentrations between animals with a synchronization window of ≤4 hpr (2.9 µg/L) and longer synchronization windows such as ≤12 hpr (5.1 µg/L) and ≤24 hpr (16.8 µg/L). A concurrent decreasing trend in molting median effect concentrations was observed for the same synchronization windows: ≤4 hpr (4.0 µg/L), ≤12 hpr (5.9 µg/L), and ≤24 hpr (30.0 µg/L). Together, our results show that both synchronization and absolute age are determinant factors for the sensitivity of D. magna to TEF. A narrow synchronization window (e.g., ≤4 hpr) may provide a more conservative estimate of TEF toxicity and should be considered when one is performing standardized toxicity tests for molting-disrupting compounds such as TEF.

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Strain difference in sensitivity to 3,4-dichloroaniline and insect growth regulator, fenoxycarb, in Daphnia magna

Cited by 40 publications

References 15 publications

Performance of standard media in toxicological assessments with Daphnia magna: chelators and ionic composition versus metal toxicity

Performance of standard media in toxicological assessments with Daphnia magna: chelators and ionic composition versus metal toxicity

Pesticide exposure impacts not only hatching of dormant eggs, but also hatchling survival and performance in the water flea Daphnia magna

Age and Synchronization of Daphnia magna Affect Sensitivity to Teflubenzuron in Acute Standardized Toxicity Tests

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