title: Chattonella (Raphidophyceae) bloom spatio-temporal variations in Tachibana Bay and the southern area of Ariake Sea, Japan: Interregional displacement patterns with Skeletonema (Bacillariophyceae).
abstract: In 2010, a massive bloom of the raphidophycean flagellate Chattonella occurred in the Ariake Sea and Tachibana Bay. Bloom dynamics and hydrographical conditions were examined by field survey. The development and decline of the bloom occurred three times in Tachibana Bay. First and third bloom developments synchronized with precipitation, and the second bloom developed in synchronization with a salinity decrease which occurred in relation to an increase of river discharge from the Chikugo River which takes several days to flow from the Ariake Sea. These results imply that the bloom was transported with the low salinity water from the Ariake Sea to Tachibana Bay. During blooms along the northern coast of Shimabara Peninsula, the predominant phytoplankton species changed from Chattonella to Skeletonema. Low salinity water intrusion induced an interregional difference of the Chattonella and Skeletonema bloom spatially-differentiated by the salinity in the Ariake Sea and Tachibana Bay.
authors.affiliation: National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan. Electronic address: kazuaoki@affrc.go.jp.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Aoki
authors.affiliation: National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan.
authors.forename: Goh
authors.initials: G
authors.lastname: Onitsuka
authors.affiliation: National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Shimizu
authors.affiliation: Nagasaki Prefectural Institute of Fisheries, 1551-4 Taira, Nagasaki, Nagasaki 851-2213, Japan.
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Yamatogi
authors.affiliation: Nagasaki Prefectural Tsushima District Fisheries Extension Advisory Center, 668 Kusubo, Mitsushima, Tsushima, Nagasaki 817-0324, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Ishida
authors.affiliation: Nagasaki Prefectural Nagasaki District Fisheries Extension Advisory Center, 1551-4 Taira, Nagasaki, Nagasaki 851-2213, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kitahara
authors.affiliation: Fisheries Department, Nagasaki Prefectural Government, 2-13 Edomachi, Nagasaki, Nagasaki 850-8570, Japan.
authors.forename: Keiji
authors.initials: K
authors.lastname: Hirano
mesh_terms: D061006:Bays; D017377:Diatoms / Q000254:growth & development / Q000502:physiology; D004784:Environmental Monitoring / Q000379:methods; D005068:Eutrophication; D007564:Japan; D010839:Phytoplankton / Q000254:growth & development; D045483:Rivers; D054712:Salinity; D062211:Spatio-Temporal Analysis; D058009:Stramenopiles / Q000254:growth & development* / Q000502:physiology
keywords: Ariake Sea; Chattonella; Low salinity water; Skeletonema; Tachibana Bay