Assimilation and subcellular partitioning of elements by grass shrimp collected along an impact gradient

Seebaugh, David R.; Wallace, William G.

doi:10.1016/j.aquatox.2009.04.010

Cited by 22 publications

(23 citation statements)

References 58 publications

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“…Hg assimilation by penaeid shrimp fed field-contaminated fish tissue was approximately 72 % (Evans et al 2000). There was, however, overlap between the range of AE-109 Cd% values (approximately 54-75 %) for field-collected shrimp after consumption of amphipods (exposed to approximately 0.025 lM dissolved Cd) and values in the present study (Seebaugh and Wallace 2009). Recent work has demonstrated that inorganic Hg and Cd assimilation can be influenced by prey type, indicating the necessity of estimating AE for elements by a species across the range of potential food organisms in the field (as well as taxonomically and ecologically related surrogate prey) in addition to testing impacts of previous exposure or other environmental parameters (Dutton and Fisher 2011).…”

Section: Discussioncontrasting

confidence: 69%

“…Ingested cpm for 14 C is the sum of 14 C retained and in cumulative feces for shrimp at t = 24 h. Correlations between AE and ingested cpm were analyzed for individual pre-exposure treatments as well as treatment groups using Pearson product-moment correlation (r except where indicated otherwise). Data that did not fit a normal distribution were analyzed using Spearman rank correlation (r s ) AE-203 Hg% by field-collected shrimp fed laboratorycontaminated amphipod prey (exposed to approximately 0.005 lM dissolved Hg) was greater (approximately 61-78 %) than the maximum value observed for Hg pre-exposed shrimp (Seebaugh and Wallace 2009). Hg assimilation by penaeid shrimp fed field-contaminated fish tissue was approximately 72 % (Evans et al 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Relationships between AE by consumers and metal partitioning in their respective food organisms are, however, quite variable and must be evaluated on a case-by-case basis to determine if TAM can serve as reliable indicator of dietary metal dose (Rainbow et al 2011). Subsamples of worms were homogenized in 3.3 ml cold Tris buffer (pH 7.6) and centrifuged at 5009g (15 min at 4°C) to separate TAM from non-TAM fractions (Seebaugh and Wallace 2009). Subsamples of homogenized tissues were removed before centrifugation and analyzed for whole tissue Hg concentrations.…”

Section: Hg-contaminated Oligochaetesmentioning

confidence: 99%

“…This species is consumed by a variety of predators and may be important in pollutant transfer within estuarine trophic webs (Davis et al 2003). Intraspecific variability in mercury (Hg) and cadmium (Cd), but not carbon, assimilation was reported for shrimp collected within an urbanized estuary and may be related to postassimilatory impacts in individuals inhabiting industrialized waterways (Seebaugh and Wallace 2009). Differences in predator avoidance after laboratory exposure to Hg were reported for shrimp populations from reference and Hg-contaminated sites (Kraus and Kraus 1986).…”

mentioning

confidence: 97%

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Assimilation of Elements and Digestion in Grass Shrimp Pre-Exposed to Dietary Mercury

Seebaugh

Wallace

Lamoreaux

et al. 2012

Arch Environ Contam Toxicol

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Grass shrimp Palaemonetes pugio were fed mercury (Hg)-contaminated oligochaetes for 15 days and analyzed for Hg, cadmium (Cd), and carbon assimilation efficiencies (AE) as well as toxicological end points related to digestion. Disproportionate increases in stable Hg concentrations in shrimp did not appear to be related to partitioning to trophically available Hg in worms. Hg AE by pre-exposed shrimp reached a plateau (approximately 53 %), whereas Cd AE varied (approximately 40-60 %) in a manner that was not dose-dependent. Carbon AE did not differ among treatments (approximately 69 %). Gut residence time was not impacted significantly by Hg pre-exposure (grand median approximately 465 min), however, there was a trend between curves showing percentages of individuals with markers in feces over time versus treatment. Feces-elimination rate did not vary with dietary pre-exposure. Extracellular protease activity varied approximately 1.9-fold but did not exhibit dose-dependency. pH increased over the range of Hg pre-exposures within the anterior (pH approximately 5.33-6.51) and posterior (pH approximately 5.29-6.25) regions of the cardiac proventriculus and Hg assimilation exhibited a negative relationship to hydrogen ion concentrations. The results of this study indicate that previous Hg ingestion can elicit post-assimilatory impacts on grass shrimp digestive physiology, which may, in turn, influence Hg assimilation during subsequent digestive cycles.

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Section: Discussioncontrasting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Hg-contaminated Oligochaetesmentioning

confidence: 99%

mentioning

confidence: 97%

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Assimilation of Elements and Digestion in Grass Shrimp Pre-Exposed to Dietary Mercury

Seebaugh

Wallace

Lamoreaux

et al. 2012

Arch Environ Contam Toxicol

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“…Previous studies indicated that subcellular distribution can be used to describe the complex binding of metal ions in different subcellular compartments with different metal ionbinding ligands (Wang and Rainbow, 2006;Buchwalter et al, 2008;Seebaugh and Wallace, 2009;Huang et al, 2010). They pointed out that metal ions binding to target subcellular compartments could reflect the metal toxicity and detoxification.…”

Section: Modeling Of Subcellular Partitioningmentioning

confidence: 99%

Toxicokinetic Modeling Challenges for Aquatic Nanotoxicology

Chen

2016

Front. Mar. Sci.

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Nanotoxicity has become of increasing concern since the rapid development of metal nanoparticles (NPs). Aquatic nanotoxicity depends on crucial qualitative and quantitative properties of nanomaterials that induce adverse effects on subcellular, tissue, and, organ level. The dose-response effects of size-dependent metal NPs, however, are not well investigated in aquatic organisms. In order to determine the uptake and elimination rate constants for metal NPs in the metabolically active/detoxified pool of tissues, a one-compartmental toxicokinetic model can be applied when subcellular partitioning of metal NPs data would be available. The present review is an attempt to describe the nano-characteristics of toxicokinetics and subcellular partitioning on aquatic organisms with the help of the mechanistic modeling for NP size-dependent physiochemical properties and parameters. Physiologically-based pharmacokinetic (PBPK) models can provide an effective tool to estimate the time course of NP accumulation in target organs and is useful in quantitative risk assessments. NP accumulation in fish should take into account different effects of different NP sizes to better understand tissue accumulative capacities and dynamics. The size-dependent NP partition coefficient is a crucial parameter that influences tissue accumulation levels in PBPK modeling. Further research is needed to construct the effective systems-level oriented toxicokinetic model that can provide a useful tool to develop quantitatively the robustly approximate relations that convey a better insight into the impacts of environmental metal NPs on subcellular and tissue/organ responses in aquatic organisms.

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Toxicokinetics of cadmium in Palaemon varians postlarvae under waterborne and/or dietary exposure

Pavlaki

Morgado

Soares

et al. 2018

Enviro Toxic and Chemistry

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The present study assessed cadmium uptake and depuration rates in the euryhaline estuarine shrimp Palaemon varians under different exposure routes. Postlarval shrimp were exposed for 4 d under different exposure routes: contaminated water, contaminated diet, and a 2-way exposure scenario where both contaminated water and diet were used. After exposure, postlarval shrimp were transferred to a clean medium and fed a noncontaminated diet for 96 h. Bioaccumulation via the different exposure routes was modeled with a standard first-order, one-compartment toxicokinetics model and one with an additional parameter reflecting an inert fraction or storage compartment. The simultaneous 2-way exposure (through water and diet) resulted in accumulation being almost twice as high as the sum of the individual exposure routes, thus indicating that accumulation from multiple routes may be more than additive. Cadmium uptake from water was faster than uptake from food maintained for 48 h at that same cadmium concentration. Shrimp were unable to eliminate cadmium from their body, showing no depuration during 96 h after exposure via different routes, thus suggesting that a longer depuration period is needed. Model comparisons did not provide a significantly better fit when the model included the presence of an inert fraction. The present study highlights the importance of assessing accumulation using multiple exposure routes compared with individual routes because the latter may underestimate bioaccumulation. Environ Toxicol Chem 2018;37:1614-1622. © 2018 SETAC.

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Assimilation and subcellular partitioning of elements by grass shrimp collected along an impact gradient

Cited by 22 publications

References 58 publications

Assimilation of Elements and Digestion in Grass Shrimp Pre-Exposed to Dietary Mercury

Assimilation of Elements and Digestion in Grass Shrimp Pre-Exposed to Dietary Mercury

Toxicokinetic Modeling Challenges for Aquatic Nanotoxicology

Toxicokinetics of cadmium in Palaemon varians postlarvae under waterborne and/or dietary exposure

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