Hepatic and renal concentrations of 10 trace elements in crocodiles (Crocodylus niloticus) in the Kafue and Luangwa rivers in Zambia

Almli, B.; Mwase, M.; Sivertsen, Tore; Musonda, M.M.; Flåøyen, A.

doi:10.1016/j.scitotenv.2004.06.019

Cited by 35 publications

(15 citation statements)

References 12 publications

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“…This may indicate that these metals do not readily bioaccumulate in alligators or that these metals are not present in high concentrations in the environment in the Charleston area. Almli et al (2005) also found low concentrations of Cd and As in crocodile liver tissue.…”

Section: Discussionmentioning

confidence: 80%

“…Food habits should also differ between larger and smaller alligators, putting larger alligators more at risk for heavy metal contamination due to the probability of feeding on larger prey items. Almli et al (2005) did not find a relationship between body length of crocodiles (Crocodylus niloticus) and Hg and Pb concentrations, and Jagoe et al (1998) did not always find a correlation between American alligator length and Hg concentration. Female alligators usually remain in a small area, whereas male alligators have a much larger home range, especially during the breeding season (Levy, 1991).…”

Section: Discussionmentioning

confidence: 85%

“…Selenium is thought to be an important component of detoxification of methyl-Hg (Martoja and Berry, 1980;Chen et al, 2006). Positive relationships between Hg and Se have been documented in crocodiles (Almli et al, 2005). Molar Se:Hg ratios observed in liver have been shown to vary in different organisms (Dietz et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

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Heavy Metal and Selenium Concentrations in Liver Tissue From Wild American Alligator (Alligator Mississippiensis) Livers Near Charleston, South Carolina

Campbell

Waters

Tarter

et al. 2010

Journal of Wildlife Diseases

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 85%

See 1 more Smart Citation

Heavy Metal and Selenium Concentrations in Liver Tissue From Wild American Alligator (Alligator Mississippiensis) Livers Near Charleston, South Carolina

Campbell

Waters

Tarter

et al. 2010

Journal of Wildlife Diseases

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“…In Africa, Almi et al (2005) found hepatic Pb concentrations ranging from 0.71 to 17 µg/g and renal concentrations ranging from 0.07 to 2.2 µg/g from tissue samples harvested from nine Nile crocodiles (Crocodylus niloticus) in the Kafue and Luangwa Rivers in Zambia. Swanepoel et al (2000) noted comparable values in Pb concentrations from kidney and liver tissues collected from 15 Nile crocodiles in the Kruger National Park, South Africa, with the highest concentration (19.85 µg/g) occurring in the liver of an individual from the Olifants River.…”

Section: Introductionmentioning

confidence: 99%

Blood lead concentrations in free-ranging Nile crocodiles (Crocodylus niloticus) from South Africa

et al. 2016

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Generally crocodilians have received little attention with regard to the effects of lead toxicity despite their trophic status as apex, generalist predators that utilize both aquatic and terrestrial habitats, thereby exposing them to a potentially wide range of environmental contaminants. During July-October 2010 we collected whole blood from 34 sub-adult and adult free-ranging Nile crocodiles (Crocodylus niloticus) from three separate populations in northeastern South Africa in order to analyze their blood lead concentrations (BPb). Concentrations ranged from below detectability (<3 μg/dL, n = 8) to 960 μg/dL for an adult male at the Lake St Lucia Estuary. Blood lead concentrations averaged 8.15 μg/dL (SD = 7.47) for females and 98.10 μg/dL (SD = 217.42) for males. Eighteen individuals (53 %) had elevated BPbs (≥10 μg/dL). We assessed 12 general linear models using Akaike's Information Criterion (AIC) and found no significant statistical effects among the parameters of sex, crocodile size and population sampled. On average, crocodiles had higher BPbs at Lake St Lucia than at Ndumo Game Reserve or Kosi Bay, which we attribute to lead sinker ingestion during normal gastrolith acquisition. No clinical effects of lead toxicosis were observed in these crocodiles, even though the highest concentration (960 μg/dL) we report represents the most elevated BPb recorded to date for a free-ranging vertebrate. Although we suggest adult Nile crocodiles are likely tolerant of elevated Pb body burdens, experimental studies on other crocodilian species suggest the BPb levels reported here may have harmful or fatal effects to egg development and hatchling health. In light of recent Nile crocodile nesting declines in South Africa we urge further BPb monitoring and ecotoxicology research on reproductive females and embryos.

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“…Molybdenum is an inorganic micro mineral, which has a multifaceted role and is a structural component of enzymes viz xanthine oxidase, aldehyde oxidase, sulfate oxidase, etc. Molybdenum plays an important role in purine and pyrimidine metabolism and deficiency and can induce growth retardation, whereas excessive unbalanced molybdenum will affect copper absorption (Almli et al 2005). …”

Section: Resultsmentioning

confidence: 99%

Protective Effects of Embelin and Curcumin against Diethylnitrosamine / Phenobarbital induced Experimental Hepatocarcinogenesis in Rats

Jagadeesh¹,

Sreepriya²,

Bali³

et al. 2012

Int J Life Sci

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The effects of administration of Curcumin and Embelin on the levels of certain trace elements and other elements of clinical significance, during experimental hepatocarcinogenesis induced by Diethylnitrosamine/ Phenobarbital (DENA/PB) was studied in Wistar strain male albino rats. The levels of calcium, potassium and sodium were determined in the serum of control and experimental groups of rats. Additionally, the levels of chromium, copper, magnesium, molybdenum and zinc were also determined in the serum, liver and kidney of these rats. Furthermore, lactate dehydrogenase (LDH) activity was also assayed in the serum of these rats. Results revealed both significant and non-significant alterations in the levels of few elements during DENA/PB-induced experimental hepatocarcinogenesis. A statistically significant increase in LDH activity was found in the serum during the cancerous condition. Pre- and co-treatment with Curcumin and Embelin was found to protect the liver against the carcinogenic effects of DENA/PB. This protection was i) due to their ability to prevent changes in the levels of elements studied and ii) by the statistically significant decrease in the activity of LDH that increased in DENA/PB-treated rats and LDH activity in the rats given only Embelin and Curcumin indicating their non-toxic effect. Our present results demonstrate the ability of Embelin and Curcumin to protect against DENA/PB-induced hepatocarcinogenesis in rats.DOI: http://dx.doi.org/10.3126/ijls.v5i1.5576 International Journal of Life Sciences Vol.5(1) 2011 51-56

show abstract

Hepatic and renal concentrations of 10 trace elements in crocodiles (Crocodylus niloticus) in the Kafue and Luangwa rivers in Zambia

Cited by 35 publications

References 12 publications

Heavy Metal and Selenium Concentrations in Liver Tissue From Wild American Alligator (Alligator Mississippiensis) Livers Near Charleston, South Carolina

Heavy Metal and Selenium Concentrations in Liver Tissue From Wild American Alligator (Alligator Mississippiensis) Livers Near Charleston, South Carolina

Blood lead concentrations in free-ranging Nile crocodiles (Crocodylus niloticus) from South Africa

Protective Effects of Embelin and Curcumin against Diethylnitrosamine / Phenobarbital induced Experimental Hepatocarcinogenesis in Rats

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