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Microplastics Not Shown to Affect Coral Health in the Field Like in Laboratory Studies
Summary
Researchers examined the relationship between microplastic concentrations and coral health indicators in field settings globally, using data from two databases filtered to observations within 0.2 degrees of coral reef locations. They found that field studies did not replicate the negative effects on coral health observed in controlled laboratory experiments, suggesting that the simplified conditions of laboratory studies may not accurately represent the complexity of natural reef environments.
Microplastics, an emerging pollutant shorter than 5mm, pose a significant threat as their concentrations increase. With coral reef health in decline, particularly due to rising temperatures, concerns on the effect of microplastics on reef health have arisen. Previous studies investigating this relationship in laboratories have poorly imitated the complexity of field conditions. Therefore, this study explores the effect of microplastics on coral health in the field globally to better understand this pollutant’s threat. By utilizing two databases and filtering data points to those within a 0.2 degree overlap (longitude and latitude), coral mortality, and secondarily, bleaching, were analyzed against the amount of microplastics. Data cleaning was performed to remove invalid or non-quantitative values such as “low” and “severe.” Initial analysis revealed that all variables lacked a normal distribution, and various transformations failed to produce a normal curve. Hence, nonparametric statistical tests were used, such as Spearman’s Rank Correlation. Mortality data exhibited a weak positive correlation to microplastics; however, at lower quantities of microplastics, there was a range in coral mortality, while at higher quantities, only high mortality values were present. The same analysis conducted with bleaching data showed no correlation. This suggests microplastics are a factor adversely affecting coral mortality but not bleaching in conjunction with other environmental concerns. Hence, these findings do not support that of laboratory studies, which find significant negative effects to coral. This study demonstrates the need for further field research to understand microplastics’ role compared to other threats corals face.