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タイトル: Persistent whole-bay red tide of Noctiluca scintillans in Manila Bay, Philippines
著者: Furuya, Ken
Saito, Haruna
Rujinard, Sriwoon
Anil K. Vijayan
Omura, Takuo
Elsa E. Furio
Valeriano M. Borja
Sopana, Boonyapiwat
Thaithaworn, Lirdwitayaprasit
キーワード: Noctiluca scientillans
Pedinomonas noctilucae
red tide
symbiosis
Manila Bay
growth
feeding
発行日: 2006年4月28日
出版者: International Coastal Research Center, Ocean Research Institute, the University of Tokyo
掲載誌情報: Coastal marine science. Vol.30No.1, 2006.4, pp. 74-79
抄録: Noctiluca scintillans, which contains a photosynthetic endosymbiont, Pedinomonas noctilucae, formed perennial red tides in Manila Bay, Philippines, occasionally covering almost whole area since 2001. A whole-bay scale red tide of the green Noctiluca in Manila Bay is described as the first step to elucidate the formation mechanism of the large scale blooming of the organism. A field survey was conducted in March 2004, when greenish discoloration due to N. scintillans was observed in the whole bay. The bloom persisted at least for two months from late February to late April 2004 as revealed by SeaWiFS images and sea-truth observations. Chlorophyll a varied from 0.55 to 522μgL^<-1> in the upper 10-m water column, 28 to 94% of which was ascribed to N. scintillans with a mean of 75±17%(n=60) as revealed by HPLC analysis of bio-marker pigments with CHEMTAX interpretation. In-situ specific growth rate was too low for the continuous dominance of N. scintillans in the bay, where potentially fast growing diatoms occurred as secondary dominant species. While the endosymbiosis of P. noctilucae provides competitive advantages for N. scintillans under conditions with low availability of external food supply or insufficient light intensity for photosynthesis of the symbiont, no suitable explanation was obtained for the persistent dominance. Trophic status of the green Noctiluca appears to be crucial.
URI: http://hdl.handle.net/2261/5610
ISSN: 13493000
出現カテゴリ:Coastal Marine Science
Coastal Marine Science

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