Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station.
We investigated the radiocaesium content of nine epiphytic foliose lichens species and the adjacent barks of Zelkova serrata (Ulmaceae, "Japanese elm") and Cerasus sp. (Rosaceae, "Cherry tree") at the boundary of the Fukushima Dai-ichi Nuclear Power Station six years after the ac...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2021-01-01
|
| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0251828 |
| _version_ | 1818826712037720064 |
|---|---|
| author | Terumi Dohi Yoshihito Ohmura Kazuya Yoshimura Takayuki Sasaki Kenso Fujiwara Seiichi Kanaizuka Shigeo Nakama Kazuki Iijima |
| author_facet | Terumi Dohi Yoshihito Ohmura Kazuya Yoshimura Takayuki Sasaki Kenso Fujiwara Seiichi Kanaizuka Shigeo Nakama Kazuki Iijima |
| author_sort | Terumi Dohi |
| collection | DOAJ |
| description | We investigated the radiocaesium content of nine epiphytic foliose lichens species and the adjacent barks of Zelkova serrata (Ulmaceae, "Japanese elm") and Cerasus sp. (Rosaceae, "Cherry tree") at the boundary of the Fukushima Dai-ichi Nuclear Power Station six years after the accident in 2011. Caesium-137 activities per unit area (the 137Cs-inventory) were determined to compare radiocaesium retentions of lichens (65 specimens) and barks (44 specimens) under the same growth conditions. The 137Cs-inventory of lichens collected from Zelkova serrata and Cerasus sp. were respectively 7.9- and 3.8-times greater than the adjacent barks. Furthermore, we examined the radiocaesium distribution within these samples using autoradiography and on the surfaces with an electron probe micro analyzer (EPMA). Autoradiographic results showed strong local spotting and heterogeneous distributions of radioactivity in both the lichen and bark samples, although the intensities were lower in the barks. The electron microscopy analysis demonstrated that particulates with similar sizes and compositions were distributed on the surfaces of the samples. We therefore concluded that the lichens and barks could capture fine particles, including radiocaesium particles. In addition, radioactivity was distributed more towards the inwards of the lichen samples than the peripheries. This suggests that lichen can retain 137Cs that is chemically immobilised in particulates intracellularly, unlike bark. |
| first_indexed | 2024-12-19T00:32:01Z |
| format | Article |
| id | doaj.art-3fb563ec0f7a4c3bac15d71d4b4dd040 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-19T00:32:01Z |
| publishDate | 2021-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-3fb563ec0f7a4c3bac15d71d4b4dd0402022-12-21T20:45:03ZengPublic Library of Science (PLoS)PLoS ONE1932-62032021-01-01165e025182810.1371/journal.pone.0251828Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station.Terumi DohiYoshihito OhmuraKazuya YoshimuraTakayuki SasakiKenso FujiwaraSeiichi KanaizukaShigeo NakamaKazuki IijimaWe investigated the radiocaesium content of nine epiphytic foliose lichens species and the adjacent barks of Zelkova serrata (Ulmaceae, "Japanese elm") and Cerasus sp. (Rosaceae, "Cherry tree") at the boundary of the Fukushima Dai-ichi Nuclear Power Station six years after the accident in 2011. Caesium-137 activities per unit area (the 137Cs-inventory) were determined to compare radiocaesium retentions of lichens (65 specimens) and barks (44 specimens) under the same growth conditions. The 137Cs-inventory of lichens collected from Zelkova serrata and Cerasus sp. were respectively 7.9- and 3.8-times greater than the adjacent barks. Furthermore, we examined the radiocaesium distribution within these samples using autoradiography and on the surfaces with an electron probe micro analyzer (EPMA). Autoradiographic results showed strong local spotting and heterogeneous distributions of radioactivity in both the lichen and bark samples, although the intensities were lower in the barks. The electron microscopy analysis demonstrated that particulates with similar sizes and compositions were distributed on the surfaces of the samples. We therefore concluded that the lichens and barks could capture fine particles, including radiocaesium particles. In addition, radioactivity was distributed more towards the inwards of the lichen samples than the peripheries. This suggests that lichen can retain 137Cs that is chemically immobilised in particulates intracellularly, unlike bark.https://doi.org/10.1371/journal.pone.0251828 |
| spellingShingle | Terumi Dohi Yoshihito Ohmura Kazuya Yoshimura Takayuki Sasaki Kenso Fujiwara Seiichi Kanaizuka Shigeo Nakama Kazuki Iijima Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. PLoS ONE |
| title | Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. |
| title_full | Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. |
| title_fullStr | Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. |
| title_full_unstemmed | Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. |
| title_short | Radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the Fukushima Dai-ichi Nuclear Power Station. |
| title_sort | radiocaesium accumulation capacity of epiphytic lichens and adjacent barks collected at the perimeter boundary site of the fukushima dai ichi nuclear power station |
| url | https://doi.org/10.1371/journal.pone.0251828 |
| work_keys_str_mv | AT terumidohi radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT yoshihitoohmura radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT kazuyayoshimura radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT takayukisasaki radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT kensofujiwara radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT seiichikanaizuka radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT shigeonakama radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation AT kazukiiijima radiocaesiumaccumulationcapacityofepiphyticlichensandadjacentbarkscollectedattheperimeterboundarysiteofthefukushimadaiichinuclearpowerstation |