Anthropogenic Marine Debris (AMD) in Mangrove Forests of Pujada Bay, Davao Oriental, Philippines

Abstract

Anthropogenic marine debris (AMD) is a global threat to marine biodiversity and marine ecosystems. The main objectives of this study were to compare and characterize the AMD composition of mangrove stands that are located in a reserve area and mangrove stands that are influenced by nearby human settlement. Two study areas were chosen based on similar mangrove species composition and stand where transect quadrats (50 x 50m) were established in the area. The AMD were sampled during low tide in six subplots (5 x 5m) located in the transect quadrats in the mangrove forest of Dahican and Matiao, in Pujada bay, Davao Oriental. Various types of AMD were collected, cleaned and dried and then weighted and classified as belonging to plastics, cloths, rubber, glass, metals, wood or other items. Comparison of weight of AMD between the two study areas (Dahican and Matiao) showed no significant differences (P=0.119). In terms of comparison of different categories in the two study areas, only Matiao showed significant differences (P<0.001) with the category of cloth contributing highly at 39 g. There was no significant difference of the categories for the study area in Dahican (P=0.137). Further confirmatory studies on AMD and mangroves and its ability to trap AMDs are suggested including the impacts of AMD on marine fauna and flora.