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Mercury in Morelet's crocodile eggs from northern Belize
T R Rainwater1, B M Adair, S G Platt
1The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Box 41163, Lubbock, Texas 79409-1163, USA. thomas.rainwater@tiehh.ttu.edu
Archives of Environmental Contamination and Toxicology
|March 23, 2002
Summary
Mercury was detected in all Morelet's crocodile (Crocodylus moreletii) eggs studied in Belize. While concentrations were generally low, site-specific variations suggest localized mercury contamination impacting these vulnerable reptiles.
Area of Science:
- Environmental Toxicology
- Herpetology
- Ecotoxicology
Background:
- Mercury accumulation in crocodilians is a growing concern.
- Most research focuses on tissue concentrations, neglecting egg analysis.
- Understanding mercury levels in eggs is crucial for assessing reproductive health.
Purpose of the Study:
- To quantify mercury levels in Morelet's crocodile (Crocodylus moreletii) eggs.
- To compare mercury concentrations across different nesting localities in Belize.
- To investigate potential sources of mercury variability and its implications for crocodilians.
Main Methods:
- Analysis of mercury in 31 nonviable Morelet's crocodile eggs from eight nests.
- Sampling conducted across three distinct localities in northern Belize in July 1995.
- Comparison of mercury concentrations on individual egg and mean nest bases.
Main Results:
- All analyzed eggs contained mercury, with overall low mean concentrations compared to other crocodilians.
- Sapote Lagoon exhibited the lowest reported mean mercury concentration in eggs.
- Significant variability in mercury levels was observed among localities, indicating site-specific contamination.
Conclusions:
- Mercury presence in eggs indicates exposure in adult females, embryos, and neonates.
- No overt signs of mercury toxicity or population decline were observed in the studied crocodiles.
- Further research, including laboratory studies and long-term monitoring, is essential to determine the biological significance of mercury exposure in crocodilians.
