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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第68巻 第1号 >
Different Nutrient Availabilities of Surface and Bottom Water under Nutrient-depleted Conditions during Bloom Formation of the Toxic Dinoflagellate Alexandrium tamarense in Osaka Bay, Japan
| Title: | Different Nutrient Availabilities of Surface and Bottom Water under Nutrient-depleted Conditions during Bloom Formation of the Toxic Dinoflagellate Alexandrium tamarense in Osaka Bay, Japan |
| Authors: | Natsuike, Masafumi Browse this author | | Shiraishi, Tomotaka Browse this author | | Ishii, Ken-Ichiro Browse this author | | Yamamoto, Keigo Browse this author | | Nakajima, Masaki Browse this author | | Sawayama, Shigeki Browse this author →KAKEN DB | | Imai, Ichiro Browse this author →KAKEN DB |
| Keywords: | Alexandrium tamarense | | Skeletonema | | Nutrients | | Bioavaiilability | | Osaka Bay | | Algal growth potential | | Limiting |
| Issue Date: | 16-Mar-2018 |
| Publisher: | 北海道大学大学院水産科学研究院 |
| Journal Title: | 北海道大学水産科学研究彙報 |
| Volume: | 68 |
| Issue: | 1 |
| Start Page: | 7 |
| End Page: | 16 |
| Abstract: | Alexandriium tamarense is a toxic dinoflagellate known to produce neurotoxins cause paralytic shellfish poisoning to human and marine animals. To understand the growth dynamics of A.tamarense, the seasonal changes in A,tamarense vegetative cells and environmental factors were evaluated using monthly field observations at two fixed stations in Osaka Bay, Japan, from January to May 2008. Additionally, a bioassay with axenic A.tamarense clonal cultures was performed to determine the growth potentials and growth-limiting nutrients of seawater samples collected during the field observations. The density of A.tamarense increased from February to April, and depletions of dissolved phosphate and silicate were observed in the surface layer during this period. The bioassay showed that phosphorous limitation occurred at the surface water of one station during March and April, while nitrogen limitation occurred in the bottom water. Moreover, at the other station, the growth potentials of the bottom water were higher than those of the surface water during February and April. Thus, the differences of nutrient availabilities between surface and bottom water during spring in Osaka Bay potentially allow A.tamarense to grow with nutrients uptake from bottom water by vertical migration. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/68502 |
| Appears in Collections: | 北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第68巻 第1号
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