Effects of the microplastics in plastics feeding and fecal pellets sinking rates for the marine copepod Calanus sinicus

Effects of the microplastics in plastics feeding and fecal pellets sinking rates for the marine copepod Calanus sinicus
Park, Ye Un; Lee, Kyun Woo; Park, Jae Gon; Baek, Seung Ho
KIOST Author(s)
Park, Ye Un(박예은)Lee, Kyun Woo(이균우)Park, Jae Gon(박재곤)Baek, Seung Ho(백승호)
Alternative Author(s)
박예은; 이균우; 박재곤; 백승호
Publication Year
Plastic debris is prevalent in marine across worldwide and it has been recognized that it
affects marine ecosystem and organisms especially by consuming. Microplastics could be
attached with harmful chemicals and carry to zooplankton by feeding. Depending on their
sizes, microplastics might be bioaccumulation or be excreted by fecal pellets, and those
pellets also could be ingested for marine organisms. Thus, we investigated the effects of microplastics
for plastics feeding rates and fecal pellets sinking rates of marine copepod Calanus
sinicus according to three diameters (0.5, 6.0, 20.0 μm) and two mass concentrations
(500, 5000 mg/m³). We collected C. sinicus from The East Sea (35°03’32.4”N, 129°06’32.5”E)
and feeding fluorescence labeled microplastics with three algae Thalassiosira weissiflogii,
Chaetocerus simplex and Isocrysis galbana. After 18 hours, we calculated the feeding rates
by counting the number of total pellets and microplastics in pellets. And then, we investigated
sinking rates by dropping the pellets into filtered seawater and measuring sinking
velocity. Subsequently, we measured length and diameter of pellets and calculated pellet
density by Stoke’s law. The weight and number of microplastics were significantly higher at
high than low concentration. The number of 0.5 μm diameter microplastics was detected
the most, however the weight of 20.0 μm diameter was calculated the heaviest. Also, feeding
rates were measured the highest at the low concentration of 20.0 μm diameter. Sinking
rates were significantly decreased except at low concentration of 0.5 and 20.0 μm diameter
microplastics and density was significantly decreased at high concentration of 0.5 and 20.0
μm diameter. In this study we could be suggested that C. sinicus could ingest microplastics
and discharged by fecal pellets. Microplastics almost decrease fecal pellets sinking rates
and it could cause other marine organisms more likely to feed and adverse effect would be
Bibliographic Citation
2022년도 한국해양학회 추계학술대회, 2022
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