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Bloom dynamics of noxious Chattonella spp. (Raphidophyceae) in contrastingly enclosed coastal environments: a comparative study of two coastal regions

Published online by Cambridge University Press:  20 February 2017

Haruo Yamaguchi ,
Yuko Tanimoto ,
Yoshihiro Hayashi ,
Satoshi Suzuki ,
Mineo Yamaguchi  and
Masao Adachi
Haruo Yamaguchi*
Affiliation:
Faculty of Agriculture and Marine Sciences, Kochi University, Nankoku, Kochi 783-8502, Japan
Yuko Tanimoto
Affiliation:
Faculty of Agriculture and Marine Sciences, Kochi University, Nankoku, Kochi 783-8502, Japan
Yoshihiro Hayashi
Affiliation:
Kochi Prefectural Fisheries Experimental Station, Susaki, Kochi 785-0167, Japan
Satoshi Suzuki
Affiliation:
Kochi Prefectural Fisheries Experimental Station, Susaki, Kochi 785-0167, Japan
Mineo Yamaguchi
Affiliation:
School of Marine Biosciences, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
Masao Adachi
Affiliation:
Faculty of Agriculture and Marine Sciences, Kochi University, Nankoku, Kochi 783-8502, Japan
*
Correspondence should be addressed to: H. Yamaguchi, Faculty of Agriculture and Marine Sciences, Kochi University, Nankoku, Kochi 783-8502, Japan email: [email protected]
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Abstract

Harmful algal blooms caused by raphidophyte species of the genus Chattonella (i.e. Chattonella antiqua, Chattonella marina and Chattonella ovata) have been documented in temperate coastal regions around the world. To understand the effects of physicochemical factors on bloom development of Chattonella spp., we investigated the variations of vegetative and resting cells (i.e. cysts) of Chattonella spp. and environmental variables in two coastal environments, Uranouchi Inlet (extremely closed) and Nomi Inlet (semi-closed), with contrasting enclosed natures. Although the vegetative cells and cysts of Chattonella spp. were distributed in both coastal regions, the densities were remarkably higher in Uranouchi Inlet than in Nomi Inlet. The mud content in the sediments of Uranouchi Inlet was also higher than that in the sediments of Nomi Inlet, meaning that fine particles such as cysts are likely to accumulate in the former region. Because of the extremely closed nature of Uranouchi Inlet, warm oceanic waters of the Kuroshio Current penetrate the inlet only infrequently. These results suggest that the closed nature of coastal regions is an important factor influencing either water exchange or the resultant accumulation of Chattonella cells in coastal environments.

Keywords

harmful algal bloomsbloom developmentenclosed indexChattonellacoastal regioncystKuroshio CurrentNomi Inletresting cellUranouchi Inletvegetative cell
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 98 , Issue 4 , June 2018 , pp. 657 - 663
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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