Bioaccumulation of Cd by a European lacertid lizard after chronic exposure to Cd-contaminated food

Mann, Reinier M.; Sánchez-Hernández, Juan C.; Serra, Elisabete A.; Soares, Amadeu M.V.M.

doi:10.1016/j.chemosphere.2007.03.021

Cited by 33 publications

(12 citation statements)

References 58 publications

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“…Past attention was focused on measuring body burdens of various pollutants to wild reptiles which gave an understanding of historical exposure of given populations (Buono et al, 2007;Holem et al, 2008;Mann et al, 2007;Moss et al, 2009;Trinchella et al, 2006;De Falco et al, 2007;Keller et al, 2006;Simoniello et al, 2010;van de Merwe et al, 2010). However, the population-level effects and actual risks of pollutants on reptiles are still generally understudied (Weir et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Stereoselective metabolism, distribution, and bioaccumulation brof triadimefon and triadimenol in lizards

Wang

et al. 2014

Ecotoxicology and Environmental Safety

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a b s t r a c tIn this research, Chinese lizards (Eremias argus) were chosen as laboratory animal to evaluate the stereoselectivity in the processes of metabolism, distribution, and bioaccumulation of triadimefon. A validated chiral high-performance liquid chromatography coupled with triple quadruple mass spectrometry (HPLC-MS/MS) method was developed for determining enantiomers' residues of parent compound triadimefon and its metabolite triadimenol in lizard blood and tissues. Pharmacokinetic results of single-does exposure suggested that S-(þ )-triadimefon was metabolized easier than R-( À )-triadimefon, and RR-(þ )-triadimenol was the main metabolic product of triadimefon. During the continuous exposure of two dose (40 mg/kg bw Á d and 200 mg/kg bw Á d), enantiomers of triadimefon and triadimenol were detected in all body compartments, with the highest triadimefon concentrations in brain. However, the triadimenol concentrations were not significantly different among the compartments. The concentrations of RS-( þ)-triadimenol were negative correlated with concentrations of RR-(þ )-triadimenol both in blood (r¼ À0.775, p¼0.024) and liver (r¼ À0.834, p¼0.02) in 200 mg/kg bw Á d group, which indicates that chiral conversion between enantiomers of triadimenol might exist in the metabolic process of triadimefon. In all the processes, the enantiomer fractions (EFs) of R-(À )-triadimefon and RR-(þ )-triadimenol were significantly different from their natural ratios, 0.5 and 0.1, respectively, which proved that metabolism, bioaccumulation, and distribution of triadimefon and triadimenol in lizards were enantioselective. These results help enrich and supplement the knowledge of the stereoselective behaviour of triadimefon and triadimenol in reptile.

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Section: Introductionmentioning

confidence: 99%

Stereoselective metabolism, distribution, and bioaccumulation brof triadimefon and triadimenol in lizards

Wang

et al. 2014

Ecotoxicology and Environmental Safety

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“…This study additionally illustrates the deleterious effects of agrochemical use in Mexico and Puerto Rico, and the significant role of dissimilar habitat variables on abundance in each region (coffee height in Mexico, canopy cover in Puerto Rico). For plots that included agrochemical applications, lizards of both regions were virtually eliminated, potentially because of reduced prey abundance, or perhaps through direct bioaccumulation of toxic substances (Mann, Sánchez‐Hernández, Serra, & Soares, 2007). …”

Section: Discussionmentioning

confidence: 99%

Anolis lizards as biocontrol agents in mainland and island agroecosystems

Monagan

Morris

Rabosky

et al. 2017

Ecology and Evolution

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Our knowledge of ecological interactions that bolster ecosystem function and productivity has broad applications to the management of agricultural systems. Studies suggest that the presence of generalist predators in agricultural landscapes leads to a decrease in the abundance of herbivorous pests, but our understanding of how these interactions vary across taxa and along gradients of management intensity and eco‐geographic space remains incomplete. In this study, we assessed the functional response and biocontrol potential of a highly ubiquitous insectivore (lizards in the genus Anolis) on the world's most important coffee pest, the coffee berry borer (Hypothalemus hampei). We conducted field surveys and laboratory experiments to examine the impact of land‐use intensification on species richness and abundance of anoles and the capacity of anoles to reduce berry borer infestations in mainland and island coffee systems. Our results show that anoles significantly reduce coffee infestation rates in laboratory settings (Mexico, p = .03, F = 5.13 df = 1, 35; Puerto Rico, p = .014, F = 8.82, df = 1, 10) and are capable of consuming coffee berry borers in high abundance. Additionally, diversified agroecosystems bolster anole abundance, while high‐intensity practices, including the reduction of vegetation complexity and the application of agrochemicals were associated with reduced anole abundance. The results of this study provide supporting evidence of the positive impact of generalist predators on the control of crop pests in agricultural landscapes, and the role of diversified agroecosystems in sustaining both functionally diverse communities and crop production in tropical agroecosystems.

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“…In reptiles and other vertebrates, Cd is mainly accumulated in liver, kidney, and pancreas and in the intestinal mucosa (Chan et al 2004;Mann et al 2007;Rie et al 2001;Vogiatzis and Loumbourdis 1998;Weigel et al 1984;Xu and Wang 2002). Intestinal mucosa is rather an organ of transport (Chan et al 2001), and once Cd is absorbed through gastrointestinal tracts into the bloodstream, Cd associates reversibly with plasma proteins (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…However, most ecotoxicological research on reptiles relies on the assessment of tissue concentrations from field-captured individuals (Hopkins 2006) and few studies have focused on the fate and the effects of contaminants (Ganser et al 2003;Hopkins et al 2002;Mann et al 2006Mann et al , 2007. Nevertheless, assessing the fundamental processes of distribution and accumulation and kinetics such as the uptake and depuration rates of contaminants is necessary in order to understand the mechanisms of bioavailability, trophic transfer, the path taken by contaminants in the body and the biological effects on reptiles.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous authors have therefore argued for an increased research effort to investigate the trophic transfer of Cd, its distribution and accumulation, and the biological effects induced by a known dose of contaminant ingested in reptiles (Burger 2008;Hopkins 2000;Mann et al 2007). Risk assessment may be biased if the toxic threshold established for another class of vertebrates is used for reptiles, where those vertebrates differ in terms of their biological and physiological characteristics (e.g., long life span, high trophic position, and ectothermic physiology; Hopkins et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Cadmium toxicokinetics and bioaccumulation in turtles: trophic exposure of Trachemys scripta elegans

Guirlet

Das

2011

Ecotoxicology

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Ecotoxicological data in reptiles are mainly represented by field studies reporting the tissue burden of wild-captured individuals but much less is known regarding the processes of uptake, depuration, accumulation and the effects of inorganic contaminants in these species. In the present study, the accumulation, the path and the effects of exposure to cadmium (Cd) through diet intake were investigated in female red eared slider turtles, Trachemys scripta elegans. In the first phase of the experiment, turtles underwent an acclimatization period during which they were fed a control diet. In the second phase, the turtles were exposed to cadmium through a CdCl 2 supplementeddiet with increased environmentally relevant concentrations for a period of 13 weeks. Following this, the turtles went through a third phase, a recovery phase of 3 weeks, during which they were fed uncontaminated food. Blood and feces were collected during the three phases of the experiment. The turtles were euthanized at the end of the experiment and organ samples collected. The Cd-concentrations in blood remained stable over the course of the experiment while Cd-concentrations in feces increased with time and with the amount of Cd ingested. The proportional accumulation in liver and kidney together was comprised between 0.7 and 6.1% and they represented the main organs of accumulation. Cd accumulated in the organs in the following order of concentration: kidney [ liver [ pancreas [ muscle. In terms of burden in organs, the Cd-burden was the highest in liver followed by kidney and pancreas. The proportional accumulation decreased as Cd ingestion increased, suggesting that at a higher dose of Cd, assimilation decreased. Mineral content of the liver and pancreas became modified according to Cd level; increasing dietary Cd exposure increased concentrations of zinc and iron in liver and copper in pancreas in a dose-dependent manner. Accumulation of Cd had no effect on survival, food consumption, growth, weight or length suggesting no effect of the treatment on female turtle body condition.

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Bioaccumulation of Cd by a European lacertid lizard after chronic exposure to Cd-contaminated food

Cited by 33 publications

References 58 publications

Stereoselective metabolism, distribution, and bioaccumulation brof triadimefon and triadimenol in lizards

Stereoselective metabolism, distribution, and bioaccumulation brof triadimefon and triadimenol in lizards

Anolis lizards as biocontrol agents in mainland and island agroecosystems

Cadmium toxicokinetics and bioaccumulation in turtles: trophic exposure of Trachemys scripta elegans

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