The complex circulation for both atmospheric and ocean affects the pathways of floating marine debris (MD). The aim of this research was to define the MD trajectories in the Indonesian boundary seas. The Lagrangian particle method was applied with oceanographic factors and debris classes based on...

Marine debris becomes a global issue due to its impact to ecosystem, human life, and marine environment. Microplastic is one of the marine debris types that need further attention due to its long term effect in marine life. The aim of the study was to investigate the microplastic transport in Java Sea, Indramayu for seven months period. The result showed that the tidal reversing current was dominant in Java Sea, with average current speed 0.04 – 0.32 m/s. The type of tidal movement in North Indramayu, Java Sea is mixed tide prevailing semidiurnal. The transport of microplastic has a circular-reversing pattern due to influences from the currents and waves. According to the result of this study, the start point of microplastics could be estimated ranges in distance 0.9 – 5.4 km from the location where they were sampled seven months later. Microplastic that currently resides in Java Sea allegedly came from South China Sea and Pacific Ocean. The result also indicates that Java Sea has a high probability to become the largest microplastic patch in Indonesia due to its reversing current, which can trap those particles for a long time (7 months microplastics mileage range of 1258.90 km – 1399.88 km), whether they originate from other ocean region or from Indonesia itself.

Marine Debris is one of the spotlight issues of the world. The existence of marine debris can disrupt the ecosystem. Marine Debris carried by the current to coastal areas and accumulated along the coast. The study area of this research was on the coastline of TundaIsland, which located between Ban-ten and Lampung Provinces. These two provinces are part of two major islands of Indonesia, Java and Sumatra Island which have a high density of population. Household needs produce every day directly proportional to the population. This study is to record what types of garbage contained along the coast. There are 8 stations used in this study using International Coastal Cleanup (ICC) form with an area of 100 m2 collection at each station. From 800m2 area coverage, 1,234 items collected with 47 kg weight of debris and the density 0.072 kg/m2 with abundance 0.75 items/m2. This result suggests that household needs give the big proportion of debris such as Food wrapper, cigarettes butts, and foam pieces. In addition, the study indicates that there is a strong relation between human activities and spreading of debris.

This study was conducted around the beaches in Indonesia in order to investigate the level of pollution in the marine environment. Thirteen (13) locations in six (6) regions namely: Seribu Island, Banten, South Java, Biawak Islands, West Papua, and East Nusa making up a total length of 12.84 km of the area were studied. This investigation focused on the debris around isolated beaches, tourist attraction centers, fishing zones and marine protected areas (MPA). The method employed in this study was dependent on the international coastal cleanup form. The samples of debris collected and studied varied from the year 2013 to 2018 for a thorough investigation. The beach debris monitoring equipment revealed information about the distribution, abundance, types and, effects of marine debris on the ecosystem. Moreover, the study showed that the mass of debris collected within the areas listed weighted 1113.10 kg for 34,330 collected items. Also, the average density was noted to range between 1.43 and 5.11 items/m². However, it was observed that plastic products constituted the highest percentage of the pollutants found in almost all the stations, with plastic bags being the most dominant.

Biota yang berasosiasi dengan ekosistem terumbu karang cukup banyak, beberapa diantaranya yaitu ikan karang dan megabentos. Riset ini bertujuan untuk mengetahui kondisi tutupan terumbu karang dan bagaimana hubungannya dengan distribusi ikan karang, megabentos serta kualitas perairan di Perairan Gosong Pramuka Kepulauan Seribu. Pengambilan data ikan karang menggunakan metode UVC, megabentos menggunakan metode Belt Transek dan pengambilan data terumbu karang menggunakan metode LIT. Data diambil pada 2 stasiun yang berlokasi pada wilayah terumbu karang alami dan wilayah yang terdapat media transplantasi karang dengan tiga kedalaman yaitu 3 m, 5 m, dan 7 m. Tutupan terumbu karang di Perairan Gosong Pramuka tergolong kriteria sedang. Kelimpahan ikan karang dan megabentos di kedalaman 3 m lebih tinggi daripada kedalaman lainnya dan memiliki nilai indeks keanekaragaman sedang. Hubungan ikan karang dengan terumbu karang pada riset ini menunjukan hubungan positif namun bernilai rendah yang artinya hubungan lemah, sedangkan hubungan megabentos dengan kualitas perairan di Gosong Pramuka memiliki nilai yang bervariasi yaitu terdapat hubungan positif kuat dan juga lemah.   Abundance, Diversity and Distribution of Coral Fish and Megabentos and their relationship to the condition of coral reefs and the quality of waters in Gosong Pramuka, Thousand Islands National Park There are quite a lot of biota associated with coral reef ecosystems, some of which are coral fish and megabentos.  This research aims to determine coral reef cover conditions, determine the distribution index of coral fish and megabentos and obtain a relationship between coral fish and coral reef conditions and megabentos with water quality in the Gosong Pramuka Waters of the Thousand Islands.  Pengambilan data coral fish using UVC method, megabentos using Belt Transek method and coral reef data retrieval using LIT method.  The data were taken at 2 stations located in natural coral reef areas and areas where there is a transplane media with three depths, namely 3 m, 5 m, and 7 m. Coral reef cover in Gosong Pramuka Waters is classified as a medium criterion. The abundance of reef fish and megabentos at a depth of 3 m is higher than other depths and has a moderate diversity index value. The relationship between coral fish and coral reefs in this study shows a positive but low-value relationship, which means a weak relationship, while the relationship between megabentos and the quality of waters in Gosong Pramuka has a varied value, namely there is a strong and also weak positive relationship.

The Citarum River flows through different characteristic of terrestrials with 297 km length and become one of the largest rivers in West Java. It potentially transfers debris from land into the sea. This research aimed to define the Marine Debris (MD) trajectories based on seasonal monsoon. The...