Quantifying the beach litter from Manado Bay (northern Sulawesi, Indonesia), which lies in the Coral Triangle, over a 5-year period (2018-2022)
Description
The dataset contains information about the weight and amount of beach litter taken over 5 years (2018 to 2022), based on type of material, the nature of material, size (macro- and meso-size). The data was obtained once a year from September to November, and they were collected from 2 sites (Malalayang Beach and Bailang Beach) in Manado Bay, within the administrative area of Manado City, Northern Sulawesi, Indonesia.
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The sampling of beach litter was carried out during the lowest low tide. On both beaches, a 100-m of long transect and 15 wide parallel to the coastline were made. The transects were marked with a rope. The transects were then divided into 5 lanes which were perpendicular to the coastline, each of which were 20 m apart. Each lane was marked with rope and flagged sticks were placed on it. A sub-transect of 5 x 5 m were placed in it and inside this sub-transect a number of 25 sub sub transects measuring a 1 x 1 m were made. All the coordinates of outer transect point and sub transect position were marked (Table 1). From the 25 sub sub transect, 5 were selected randomly for beach litter sampling (Figure 2). Beach litter of two sizes were collected, they were macro (>2.5 cm) and meso (2.5 – 0.5 cm), from all sub transect quadrants. Meso-sized litter were collected using a 0.5 cm mesh size sieve. The sediments at the beach were digged up to 3 cm depth of the substrate. The litter obtained was separated according to the number assigned for the sub sub-transect quadrants (1 x 1 m). The macro-sized litter were collected using a 2.5 cm mesh size sieve. The litter were then separated according to the sub-transect quadrants.