Persistent organic pollutant levels in eggs of leatherback turtles (Dermochelys coriacea) point to a decrease in...

Area of Science:

• Marine Biology
• Environmental Toxicology
• Conservation Science

Background:

• Sea turtles face threats from environmental pollution, particularly persistent organic pollutants (POPs).
• Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are endocrine-disrupting POPs of significant concern.
• Understanding contaminant levels in sea turtle eggs is crucial for assessing reproductive health.

Purpose of the Study:

• To establish baseline concentrations of PCBs and PBDEs in leatherback turtle (Dermochelys coriacea) eggs.
• To investigate the potential impact of PCB and PBDE congeners on leatherback reproductive success.

Main Methods:

• Analysis of 18 leatherback nests from Costa Rica during the 2008 nesting season.
• Measurement of reproductive parameters including viability, fertility, and hatching rates.
• Quantification of POP congeners using gas chromatography (GC) coupled to an ion trap detector (GC-ITD MS/MS).

Main Results:

• POP levels in leatherback eggs were comparable to French-Guiana populations and lower than Florida populations.
• A negative correlation was observed between the sum of PBDE concentrations and hatching success.
• No significant correlations were found for PCBs with reproductive parameters.

Conclusions:

• PBDEs may negatively affect leatherback sea turtle reproductive success, specifically hatching rates.
• Further research is needed to fully elucidate the reproductive impacts of POPs on sea turtles.
• Baseline POP data contributes to conservation efforts for endangered sea turtle species.