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The microscopic threat with a macroscopic impact: Microplastics along the southeast Florida reef tract
Summary
Researchers sampled surface and bottom waters along the Southeast Florida Reef Tract over six months, finding 1,204 microplastic items across seven polymer types, with significantly more plastic at the surface than the seafloor. Five additional chemical contaminants were detected on the plastics, confirming that microplastics act as vectors for hazardous substances near fragile coral reef ecosystems. The study calls for both improved plastic waste management and active clean-up to protect these reefs.
Microplastics decrease oceanic water quality and negatively impact marine life. This research quantified and classified marine plastic pollution along the Southeast Florida Reef Tract (SEFRT) to estimate the risk of microplastic damage to corals in this region. Surface and bottom water samples were collected at seven sites along the SEFRT over the course of six months and were analyzed for microplastic content. FTIR spectrophotometry was used to evaluate microplastic composition. Overall, seven plastic polymers were found across a total of 1204 microplastic items. Five contaminants were also identified, indicating that microplastics may be congregators of these hazardous contaminants. Significantly more total plastics were found in surface samples than in bottom samples, but plastic quantities were not significantly different when month, depth, and location were combined. Plastics were determined to have entered the ocean from multiple sources; in order to protect vulnerable reef ecosystems in this area, a two-factor approach is necessary to halt the release of microplastics into the ocean, including widespread plastic clean-up efforts and improvements to plastic waste management.