A total of 22 samples (20 l each) were taken at nine locations. Of the 736.47 g of debris collected, 72% by weight was plastic particles, 22% was plant material, and 6% “other”. Mean weight of debris per sample was 23.38 g plastic, 7.35 g plant matter, and 1.88 g “other” debris (Fig. 2). Small-plastic debris was found in every sample, totaling 19,100 pieces (Table 1). After being sorted, 87% of the plastic collected was fragments, while 11% was pre-production plastic pellets. Cargo Beach on Midway Atoll showed the greatest number of small-plastic pieces, followed by Turtle Beach, Midway and Halawa Valley North, Moloka'i. The least number of plastic pieces was collected at Nanakuli Beach Park on the leeward coast of O'ahu. Seeds of Cheeseweed (Malva parviflora), a non-native, herbaceous plant, were abundant in sands from both Midway Atoll and Tern Island, French Frigate Shoals, where it is a common weed ( Wagner et al., 1990).
A greater quantity of plastic occurred at the high tide line for all sites showed than at the berm (Table 2). High tide plastic pieces totaled 18,559, and weighed 496.05 g. We collected 36.32 g of plastic (541 pieces) from berm samples. The total weight of plastic for all sites combined was 532.37 g.
A total of 22 samples (20 l each) were taken at nine locations. Of the 736.47 g of debris collected, 72% by weight was plastic particles, 22% was plant material, and 6% “other”. Mean weight of debris per sample was 23.38 g plastic, 7.35 g plant matter, and 1.88 g “other” debris (Fig. 2). Small-plastic debris was found in every sample, totaling 19,100 pieces (Table 1). After being sorted, 87% of the plastic collected was fragments, while 11% was pre-production plastic pellets. Cargo Beach on Midway Atoll showed the greatest number of small-plastic pieces, followed by Turtle Beach, Midway and Halawa Valley North, Moloka'i. The least number of plastic pieces was collected at Nanakuli Beach Park on the leeward coast of O'ahu. Seeds of Cheeseweed (Malva parviflora), a non-native, herbaceous plant, were abundant in sands from both Midway Atoll and Tern Island, French Frigate Shoals, where it is a common weed ( Wagner et al., 1990).
A greater quantity of plastic occurred at the high tide line for all sites showed than at the berm (Table 2). High tide plastic pieces totaled 18,559, and weighed 496.05 g. We collected 36.32 g of plastic (541 pieces) from berm samples. The total weight of plastic for all sites combined was 532.37 g.
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