Strategy of photo-protection in phytoplankton assemblages in the Kongsfjorden, Svalbard, Arctic  

作　　者：Sun-Yong HA Doo Byoul LEE Sung-Ho KANG Kyung-Hoon SHIN 

机构地区：[1]Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-840, Republic of Korea [2]Hanyang University, Marine Environmental Science Department, 1271 Sa-3 dong, Sangnok-gu, Ansan, Kyeonggi-do, 425-791, Republic of Korea

出　　处：《Chinese Journal of Oceanology and Limnology》2016年第1期1-12,共12页中国海洋湖沼学报（英文版）

基　　金：Supported by the Korea-Polar Ocean in Rapid Transition by the Ministry of Oceans and Fisheries,Korea(KOPRI,No.PM14040)

摘　　要：Photo-protective functions were investigated in phytoplankton assemblages at Kongsfjorden, Svalbard in spring, using their UV-absorbing compounds （mycosporine-like amino acids （MAAs））, xanthophyllpigments （diadinoxanthin （DD） and diatoxanthin （DT）） and〈beta〉-dimethylsulphoniopropionate （〈beta〉-DMSP）. The dominant phytoplankton species in the inner bay were dominated by Phaeocystis spp. and nanoflagellates, while the offshore waters were dominated by Thalassiosira spp. In the inner bay, UV- absorbing compounds and xanthophyll pigments exhibited higher ratios of MAA to chlorophyll a （MAA：chl a ratio）, and both DD and DT to chlorophyll a （DD：chl a ratio and DT：chl a ratio）, respectively. Thus, the photoprotective-pigrnents such as DD and DT appear to complement MAAs in the natural phytoplankton assemblage. However, the ratio of 〈beta〉-DMSP to chlorophyll a （〈beta〉-DMSP：chl a ratio） did not show a distinct spatial distribution according to environmental factors or interspecies differences. In this study, we found that photoprotective compounds occurred in a manner dependent on the phytoplankton species composition in Kongsfjorden Bay, where Phaeocystis is the dominant species.Photo-protective functions were investigated in phytoplankton assemblages at Kongsfjorden,Svalbard in spring,using their UV-absorbing compounds(mycosporine-like amino acids(MAAs)),xanthophyll pigments(diadinoxanthin(DD) and diatoxanthin(DT)) and < beta >- dimethylsulphoniopropionate(<beta>- DMSP). The dominant phytoplankton species in the inner bay were dominated by Phaeocystis spp. and nanoflagellates,while the offshore waters were dominated by Thalassiosira spp. In the inner bay,UVabsorbing compounds and xanthophyll pigments exhibited higher ratios of MAA to chlorophyll a(MAA:chl a ratio),and both DD and DT to chlorophyll a(DD:chl a ratio and DT:chl a ratio),respectively.Thus,the photoprotective-pigments such as DD and DT appear to complement MAAs in the natural phytoplankton assemblage. However,the ratio of<beta>- DMSP to chlorophyll a(<beta>-DMSP:chl a ratio) did not show a distinct spatial distribution according to environmental factors or interspecies differences. In this study,we found that photoprotective compounds occurred in a manner dependent on the phytoplankton species composition in Kongsfjorden Bay,where Phaeocystis is the dominant species.

关 键 词：photo-protective compounds dimethylsulphoniumpropionate （DMSP） xanthophyll pigment Kongsf]orden Bay UV radiation 

分 类 号：Q948.8[生物学—植物学]