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Area of Science:

  • Marine Biology
  • Environmental Science
  • Ecotoxicology

Background:

  • Sea turtles, including loggerhead, green, and hawksbill species, face numerous anthropogenic threats.
  • Plastic pollution is a pervasive global issue impacting marine ecosystems and wildlife.

Purpose of the Study:

  • To investigate the prevalence and types of plastic ingestion in post-hatchling sea turtles along Florida's Atlantic coast.
  • To characterize the size and chemical composition of ingested plastic particles.
  • To assess the potential risk of plastic ingestion to sea turtle survival.

Main Methods:

  • Collection of 96 post-hatchling sea turtles from Florida's Atlantic coast (July 2015-November 2016).
  • Necropsy of deceased turtles to examine gastrointestinal tracts for plastic debris.
  • Chemical characterization of plastic particles using Raman microscopy.
  • Quantification of plastic particle sizes (mesoparticles, microparticles, nanoparticles).

Main Results:

  • Plastic debris was found in the gastrointestinal tracts of most necropsied turtles.
  • Identified plastics included polyethylene, polypropylene, polyethylene terephthalate, and polystyrene.
  • Ingested particles ranged from mesoparticles (1.0-8.7 mm) to nanoparticles (5-169 nm).
  • Polyethylene and polypropylene were the most common plastic types identified.

Conclusions:

  • Ingestion of micronizing plastic particles represents a substantial survival risk for endangered and threatened post-hatchling sea turtles.
  • This study provides evidence for the presence of nanoscopic plastic particles in sea turtles, suggesting their formation in the environment or post-ingestion.