First report of marine debris in Car Nicobar, a remote oceanic Island in the Nicobar archipelago, Bay of Bengal

Abstract

This study forms the first record to systematically quantify and classify the marine debris from Car Nicobar Island. Car Nicobar is a small remotely located Island in the Nicobar archipelago that is largely inhabited by Nicobarese indigenous people for ages. Considering their remote location and lack of baseline information on marine debris, we surveyed ten beaches in Car Nicobar to study the prevalence of marine debris. A total of 1438 debris items were recorded from the surveys of which plastic debris was found dominant (83.72%). Among the plastics, nets/ropes (38.87%) were found to be dominant followed by plastic bags, plastic bottles, polypropylene woven bags, plastic cans, floaters, and plastic cups. The number of debris was found to be highest in Malacca Jetty (7.2 nos/m2) and least in Mus Jetty (1.28 nos/m2). Land-based debris items from recreational and shoreline activities constituted majorly (54.52%) followed by sea-based sources such as shipping, fishing, and dumping activities (45.48%). Hierarchical Cluster Analysis (HCA) revealed that Malacca Jetty exhibited a distinct pattern of debris accumulation. Kriging interpolation was applied to understand the possible prevalence of marine debris around the coast of Car Nicobar Island. Plastic debris belonging to nearby countries such as Indonesia, Thailand, Malaysia, Myanmar, etc. was also recorded in our surveys. Shipping-based debris could be a probable source of foreign debris due to the proximity of the Nicobar archipelago to the Strait of Malacca, being one of the busiest shipping routes in the world. The baseline information generated from this study could assist the decision-makers to initiate proactive measures toward effective management of marine debris on Car Nicobar Island.