Iwate Fisheries Technology Center, Kamaishi, Iwate 026-0001, Japan; Sanriku Fisheries Research Center, Iwate University, Kamaishi, Iwate 026-0001, Japan.
Kitasato University School of Marine Biosciences, Kitasato University, Sagamihara, Kanagawa 252-0373, Japan; Kajima Technical Research Institute, Chofu, Tokyo 182-0036, Japan.
Mar Pollut Bull. 2021 Mar;164:112039. doi: 10.1016/j.marpolbul.2021.112039. Epub 2021 Jan 27.
The abundance and composition of anthropogenic marine debris from 2012 to 2014 was assessed according to three bottom trawl surveys conducted on the upper continental slope between 198 m and 501 m off the Pacific coast of northeastern Japan. The surveys quantitated marine debris as follows: 33.52-164.62 items km (January to July 2012), 91.68-215.11 items km (November 2012 to May 2013), and 160.13-178.19 items km (November 2013 to May 2014). Plastic bags or household materials mainly dominated terrestrial sources of debris. Principal component analysis latitudinally divided the study area according to debris abundance caused by geographical and hydrodynamic features. The long-term effect of tsunami-associated debris on the seafloor environment was recognized, because terrestrial sources such as heavy household materials were most abundant throughout the study period, with the additional accumulation of fishing gear and plastic bags.
根据 2012 年至 2014 年在日本东北部太平洋沿岸水深 198 米至 501 米的大陆坡进行的三次底层拖网调查，评估了人为海洋碎片的丰度和组成。调查定量了海洋碎片如下：2012 年 1 月至 7 月每公里 33.52-164.62 件，2012 年 11 月至 2013 年 5 月每公里 91.68-215.11 件，2013 年 11 月至 2014 年 5 月每公里 160.13-178.19 件。塑料袋或家用材料主要是陆地来源的碎片。主成分分析根据地理和水动力特征造成的碎片丰度将研究区域从纬度上进行了划分。海啸相关碎片对海底环境的长期影响得到了确认，因为整个研究期间，大量的家用重物等陆地来源的碎片最为丰富，同时还额外积累了渔具和塑料袋。
