한국 남해역 표층수에서 표재동물플랑크톤에 대한 미세플라스틱의 잠재적 위험

Abstract

The potential for bioavailability and physical impacts of floating debris by neustonic zooplankton was assessed by measuring the relative abundance of microplastic (<2㎜) and zooplankton in surface waters of the southern sea of Korea. Surveys using a Manta-trawl net with 330 ㎛mesh were carried out at western and eastern parts of Geoje bay before and after rainy season in 2012 and 2013. Abundances of total zooplankton and microplastic ranged from 0 to 126 inds.m-3 and 0.56-8.87 particles m-3 in May, from 43 to 644 inds.m-3 and 0.64-52.1 particles m-3 in July 2012, respectively. Abundances of total zooplankton and microplastic ranged from 9 to 315 inds.m-3 and 0.60-3.08 particles m-3 in June, from 13 to 763 inds.m-3 and 0.57-1.81 particles m-3 in July 2013, respectively. The average ratio of microplastic to zooplankton was 0.37(May) and 0.03(July) in 2012, 0.06(June) and 0.02(July) in 2013. Among observed microplastics, encounter rate of paint chips to zooplankton was relatively high before rainy season at eastern part of Geoje bay. All the values are relatively low compared to previous studies conducted in North pacific Central Gyre, Mediterranean Sea and California shore. And the reduced ratios after rainy season stemmed mainly from highly increased abundance of zooplankton compared to microplastic. This could imply that neustonic zooplankton was less susceptible to microplastic after rainy season around the Geoje bys using a Manta-trawl net with 330 ㎛mesh were carried out at western and eastern parts of Geoje bay before and after rainy season in 2012 and 2013. Abundances of total zooplankton and microplastic ranged from 0 to 126 inds.m-3 and 0.56-8.87 particles m-3 in May, from 43 to 644 inds.m-3 and 0.64-52.1 particles m-3 in July 2012, respectively. Abundances of total zooplankton and microplastic ranged from 9 to 315 inds.m-3 and 0.60-3.08 particles m-3 in June, from 13 to 763 inds.m-3 and 0.57-1.81 particles m-3 in July 2013, respectively. The average ratio of microplastic to zooplankton was 0.37(May) and 0.03(July) in 2012, 0.06(June) and 0.02(July) in 2013. Among observed microplastics, encounter rate of paint chips to zooplankton was relatively high before rainy season at eastern part of Geoje bay. All the values are relatively low compared to previous studies conducted in North pacific Central Gyre, Mediterranean Sea and California shore. And the reduced ratios after rainy season stemmed mainly from highly increased abundance of zooplankton compared to microplastic. This could imply that neustonic zooplankton was less susceptible to microplastic after rainy season around the Geoje b