Author Type

Graduate Student

Date of Award

Spring 4-24-2026

Document Type

Thesis

Publication Status

Version of Record

Submission Date

May 2026

Department

Geosciences

College Granting Degree

Charles E. Schmidt College of Science

Department Granting Degree

Geosciences

Degree Name

Master of Science (MS)

Thesis/Dissertation Advisor [Chair]

Erik Johanson

Abstract

With the pervasive use of plastics worldwide, their environmental effects can reach even the most remote ecosystems. This study examines both macro and microplastic pollution in the Greater Baybay region in western Leyte, Philippines. Samples from 10 separate sites within Baybay and its adjacent communities represent the unique environmental and geologic diversity of the central Visayan region of the Philippines. At each of the 10 sampling sites, 3 excavations were conducted, yielding 30 samples. Macroplastics were collected in the field, immediately around microplastic digs. Microplastic samples were analyzed in Florida Atlantic University’s Environmental Change Lab. It was determined that spatial proximity to local populations did not determine the rate of microplastic accumulation. The separate ecoregions excavated had an approximate influence on microplastic density. High macroplastic totals showed only a moderate correlation with microplastic density, rather than acting as a predictor. Finally, the frequency of microplastics identified was strongly skewed toward those with perimeters less than 2.5 millimeters. These findings show that not only are microplastics present in Baybay, but their migration and deposition are part of an intricate network of environmental forces.

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