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Related Experiment Video

Updated: Jul 13, 2025

Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status

Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status

Published on: May 18, 2019

Understanding contaminant exposure risks in nesting Loggerhead sea turtle populations.

Arthur D Barraza¹, Kimberly A Finlayson¹, Frederic D L Leusch¹

¹Australian Rivers Institute, School of Environment and Science, Griffith University, Gold Coast, 4222, QLD, Australia.

Marine Pollution Bulletin

|October 16, 2023

Summary

Loggerhead turtle populations are recovering at Mon Repos but not Wreck Island, potentially due to differing foraging site risks and chemical exposures. Reducing contaminants in high-risk foraging areas may aid sea turtle recovery.

Keywords:

Bioassay Loggerhead sea turtle Maternal transfer Organic contaminants Trace elements

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Area of Science:

Marine Biology
Ecotoxicology
Conservation Science

Background:

Loggerhead turtle (Caretta caretta) nest numbers show contrasting recovery trends between Mon Repos (MR) and Wreck Island (WI).
Divergent foraging locations for turtles from MR and WI suggest potential differences in environmental risks.
Understanding contaminant exposure is crucial for loggerhead turtle population health.

Purpose of the Study:

To investigate differences in trace element and organic contaminant levels in loggerhead turtles from MR and WI.
To correlate contaminant burdens with known foraging sites.
To assess the in vitro toxicity of blood extracts from these turtles.

Main Methods:

Blood, scute, and egg samples were collected from nesting loggerhead turtles at MR and WI.
Trace elements were analyzed using acid digestion.
In vitro cytotoxicity bioassays were performed on blood extracts using turtle fibroblast cells.

Main Results:

Wreck Island turtles exhibited significantly higher scute uranium and blood molybdenum compared to Mon Repos turtles.
Arsenic levels differed based on foraging location (north vs. south).
Several elements (titanium, manganese, cadmium, barium, lead, molybdenum, selenium, mercury) showed significant correlations between sample types (blood, scute, egg).
Blood extracts (75%) demonstrated significant in vitro toxicity to turtle fibroblast cells.

Conclusions:

Contaminant exposure varies between loggerhead turtle populations and foraging grounds.
Chemical exposure at higher-risk foraging sites poses a threat to loggerhead turtles and their offspring.
Mitigating chemical exposure in critical foraging areas is recommended for sea turtle conservation.