ORIGINAL RESEARCH
First Evidence of Microplastics Presence in Corals
of Jepara Coastal Waters, Java Sea: A Comparison
Among Habitats Receiving Different Degrees
of Sedimentations
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1
Tropical Marine Biotechnology Laboratory, Marine Science Department, Diponegoro University,
Semarang 50275, Indonesia
2
Coastal Resources Management, Diponegoro University, Semarang 50275, Indonesia
Submission date: 2021-05-02
Final revision date: 2021-06-18
Acceptance date: 2021-06-25
Online publication date: 2021-11-22
Publication date: 2022-01-28
Corresponding author
Agus Sabdono
Marine Science, Diponegoro University
Jl. Prof Sudharto, SH, Kampus Tembalang, Semarang 50275, Indonesia
Pol. J. Environ. Stud. 2022;31(1):825-832
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ABSTRACT
Even though the research on the richness and diversity characteristics of microplastics in coral
reef ecosystems has received great attention, however, understanding the occurrence, fate, and
impact of microplastics in corals remain still poor. The study reported here was aimed to observe the
microplastic abundance and distribution on selected life-form corals from habitats receiving different
degrees of sedimentation in the Jepara Coastal Waters, Java Sea. Microplastics were sampled from
four different locations representing a different level of sedimentations. Four coral life-forms (massive,
submassive, folious, and branching) were sampled with two replications at each location in July
2020. In the laboratory, microplastics were extracted and enumerated under fluorescent microscopy.
The study demonstrated that the means of microplastics were found to reach 16.00±7.5, 14.25±3.8,
14.80±7.9, and 9.50±3.6 particles kg-1 in the Awur Bay, Kartini Coast, Panjang Island, and Bandengan
Coast, respectively. The Awur Bay, the location with the highest sedimentation rate, has the highest
microplastic abundance. Statistically, however, there were no significantly different among site locations
(F(3,13) = 1.27, p-value = 0.327>0.05). It is indicating that there was no spatial variation in microplastic
abundance across sampling site locations. While the means of microplastics in the coral life-forms of
massive, submassive, folious, and branching corals were 9.75±6.6, 9.50±3.3, 11.50±4.5, and 17.75±2.3
particles kg-1, respectively. One-way ANOVA statistical analyses showed that there was no significant
difference in microplastic abundance among coral life-forms (F(3,10) = 2.12, p-value = 0.161>0.05). Even
there was no significant difference among coral life-forms, however, microplastics on the branching
coral lifeform showed a strong tendency to increase. The black microplastics were the primary color,
and the fiber shape is the dominant type of microplastics found in all locations. This study contributes
novel information on microplastic occurrence and composition in different coral life-forms. Besides, our results provide insights on the role of environmental filters in governing the distribution, abundance,
and diversity of microplastics on habitats receiving different degrees of sedimentation.