論文

査読有り
2009年1月

Strong bottom-up effects on phytoplankton community caused by a rainfall during spring and summer in Sagami Bay, Japan

JOURNAL OF MARINE SYSTEMS
  • Seung Ho Baek
  • ,
  • Shinji Shimode
  • ,
  • Hyun-Cheol Kim
  • ,
  • Myung-Soo Han
  • ,
  • Tomohiko Kikuchi

75
1-2
開始ページ
253
終了ページ
264
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jmarsys.2008.10.005
出版者・発行元
ELSEVIER SCIENCE BV

To assess the consequences of bottom-up effects on phytoplankton community composition during the rainy season, phytoplankton levels and environmental factors were monitored daily from 12 April to 22 July 2003 in Sagami Bay, Japan. The relevant environmental factors were analyzed using cross-correlation analyses. Based on time-series analysis, low surface salinity conditions lasting 0 or 2 days after heavy rainfalls resulted in significant nutrient loading, such as dissolved inorganic nitrogen (DIN), into the coastal area, Also, Chlorophyll-a (Chl-a) concentration frequently increased 2 and 6 days after rainfall. Based on the high total Chl-a concentration, the time was divided into three periods, from 1 to 11 May(Period A), 26 May to 9 June (Period B) and 30 June to 22 July (Period C). The phytoplankton assemblages during Period A were dominated by two dinoflagellates, Ceratium furca and Ceratium fusus. Prior to these species blooming, the heterotrophic dinoflagellate Noctiluca scintillans was dominant During Period B, the phytoplankton communides were dominated primarily by the diatoms Rhizosolenia delicatula, Hemiaulus sinensis and Navicula spp. Finally, Cerataulina dentata, Rhizosolenia spp., Lauderia borealis and Neodelphineis pelagica were dominant during Period C. After increases in phytoplankton abundance, available nitrogen (N) and phosphorous (P) were consumed and exhausted, which were considered a potential cause of the shift in the dominant organisms from large diatoms to pico- and nano-plankton in the low Chl-a environment In particular, silicate (Si) was not a major limiting factor for phytoplankton production, since the Si:DIN and Si:P ratios clearly demonstrated that there were no any potential stoichiometric Si limitations, and almost all silicate concentrations were > 2.0 mu M during this study. Our results reveal that nutrient sources supplied by river discharge arc a main cue for strong bottom-up effects on algal bloom succession during the early summer season in Sagami Bay. (c) 2008 Elsevier B.V. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/j.jmarsys.2008.10.005
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000262750800020&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.jmarsys.2008.10.005
  • ISSN : 0924-7963
  • Web of Science ID : WOS:000262750800020

エクスポート
BibTeX RIS