Review of toxicological effects caused by episodic stressor exposure

Gordon, AK; Mantel, Sukhmani; Muller, Nikite W.J.

doi:10.1002/etc.1781

Cited by 39 publications

(45 citation statements)

References 37 publications

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“…Effectively, after the absorption, metals in fish are then transported through bloodstream to the organs and tissues where they are accumulated (Adeyemo et al 2010). However, the relationship between exposure duration and biological effect can be complicated (Gordon et al 2012). Effectively, metals accumulation is influenced by both physiological (such as ingestion rate and gut passage time) and biochemical (metal partitioning and subcellular metal distribution) factors.…”

Section: Discussionmentioning

confidence: 99%

Bioaccumulation of Heavy Metals in Blood and Tissue of Striped Mullet in Two Italian Lakes

et al. 2014

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Water and sediment from Faro and Ganzirri lakes were tested for cadmium, mercury, and lead. These heavy metals have been assessed in serum and muscles of Striped Mullet Mugil cephalus. A haemogram was performed to find effects of heavy metals on haematological variables. Student's t-test showed higher Pb levels in sediments of Ganzirri Lake than Faro Lake. Two-way analysis of variance showed higher Cd and Pb concentration in muscles samples of Striped Mullet from Ganzirri Lake than from Faro Lake. Significant differences were found among haematological parameters as well. Mullet from Ganzirri Lake had lower white and red blood cell and trombocyte counts and higher mean corpuscular haemoglobin and mean corpuscular haemoglobin concentration than those from Faro Lake. Our results indicate a significant presence of lead in the environmental produces an accumulation of this metal in fish muscles.

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Section: Discussionmentioning

confidence: 99%

Bioaccumulation of Heavy Metals in Blood and Tissue of Striped Mullet in Two Italian Lakes

et al. 2014

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“…aquatic chemistry | watershed hydrology | environmental monitoring | pink noise | flicker noise T rends in stream chemistry are widely used to monitor the environmental health of the surrounding landscape (1)(2)(3), and the chemical dynamics of aquatic environments can affect the health, genetics, diversity, and ecology of their organisms (4)(5)(6)(7). Solute dynamics in streamwater also provide important clues to the structure and function of headwater drainage basins, which regulate the delivery of water, sediment, nutrients, and contaminants to rivers and lakes downstream (8,9).…”

mentioning

confidence: 99%

Universal fractal scaling in stream chemistry and its implications for solute transport and water quality trend detection

Kirchner

Neal

2013

Proc. Natl. Acad. Sci. U.S.A.

188

281

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The chemical dynamics of lakes and streams affect their suitability as aquatic habitats and as water supplies for human needs. Because water quality is typically monitored only weekly or monthly, however, the higher-frequency dynamics of stream chemistry have remained largely invisible. To illuminate a wider spectrum of water quality dynamics, rainfall and streamflow were sampled in two headwater catchments at Plynlimon, Wales, at 7-h intervals for 1-2 y and weekly for over two decades, and were analyzed for 45 solutes spanning the periodic table from H + to U. Here we show that in streamflow, all 45 of these solutes, including nutrients, trace elements, and toxic metals, exhibit fractal 1/f α scaling on time scales from hours to decades (α = 1.05 ± 0.15, mean ± SD). We show that this fractal scaling can arise through dispersion of random chemical inputs distributed across a catchment. These 1/f time series are non-self-averaging: monthly, yearly, or decadal averages are approximately as variable, one from the next, as individual measurements taken hours or days apart, defying naive statistical expectations. (By contrast, stream discharge itself is nonfractal, and self-averaging on time scales of months and longer.) In the solute time series, statistically significant trends arise much more frequently, on all time scales, than one would expect from conventional t statistics. However, these same trends are poor predictors of future trends-much poorer than one would expect from their calculated uncertainties. Our results illustrate how 1/f time series pose fundamental challenges to trend analysis and change detection in environmental systems.aquatic chemistry | watershed hydrology | environmental monitoring | pink noise | flicker noise

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“…The exposure of aquatic animals to toxicants can vary in duration, frequency, and concentration (Hoang et al 2007;Gordon et al 2012). In the case of some toxicants (e.g., pesticides), discontinuous exposure is more environmentally relevant than constant exposure (Stoughton et al 2008).…”

mentioning

confidence: 99%

Ammonia Toxicity to the Freshwater Planarian Polycelis felina: Contrasting Effects of Continuous Versus Discontinuous Exposures

Alonso

Camargo

2015

Arch Environ Contam Toxicol

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Aquatic animals can be exposed to fluctuating concentrations of toxicants. In fact, for some toxicants (i.e., pesticides, ammonia), discontinuous exposure is more environmentally relevant than constant exposure. Responses of aquatic animals to each type of exposure may be different. However, despite the high ecological relevance of behaviour, there is still scarce information on the effects of discontinuous exposure on behaviour. Our study focused on the assessment of unionized ammonia toxicity on the behaviour of a freshwater planarian under continuous exposure (3 days of exposure and 18 days of recovery) versus discontinuous exposure (3 pulses of 1 day with 6 days of recovery between pulses = total 3 days of exposure and 18 days of recovery). Behaviour was assessed as locomotion activity. Bioassays with continuous and discontinuous exposure were performed with one control and five unionized ammonia concentrations (0.14-0.35 mg N-NH3/L). Unionized ammonia in continuous exposure caused less impact on behaviour than equivalent concentrations provided in a discontinuous exposure. By contrast, continuous exposures caused more impact on survival. The discontinuous exposure may allow detoxification during recovery periods, thus increasing the probability of survival in the next pulse. Under continuous exposure, the mortality threshold could be exceeded, and animals could die in greater proportion during exposure as well as the recovery period. We conclude that behavioural activity was a sensitive endpoint to assess the contrasting effects of continuous versus discontinuous exposure and that the response of planarians to discontinuous exposure is different to its response to continuous exposure.

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Review of toxicological effects caused by episodic stressor exposure

Cited by 39 publications

References 37 publications

Bioaccumulation of Heavy Metals in Blood and Tissue of Striped Mullet in Two Italian Lakes

Bioaccumulation of Heavy Metals in Blood and Tissue of Striped Mullet in Two Italian Lakes

Universal fractal scaling in stream chemistry and its implications for solute transport and water quality trend detection

Ammonia Toxicity to the Freshwater Planarian Polycelis felina: Contrasting Effects of Continuous Versus Discontinuous Exposures

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