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タイトル: Reproductive strategy of Acartia steueri in Sagami Bay, Japan
著者: Onoue, Yasuko
Shimode, Shinji
Toda, Tatsuki
Kikuchi, Tomohiko
キーワード: egg production
diapausing egg
recruitment
Acartia steueri
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. 353-359
抄録: Reproduction, hatching success and population dynamics of the dominant copepod Acartia steueri were studied in Sagami Bay, Japan from February 2002 to December 2003. A. steueri occurred through the year in the water column, and it produced physiologically different eggs, subitaneous and diapausing. Subitaneous eggs were produced through the experimental period, whereas diapausing ones were restricted from February to August in both years. Population egg production rate (EPR) increased with the abundance of adult males and females from February and reached maximum in June. However, planktonic population of A. steueri did not increase during summer to winter because diapausing eggs occupied a great part of their reproduction (~98%). Recruitment rates in October to December 2002 and September 2003 were higher than population EPR, implying that diapausing eggs of A. steueri had a key role to support the recruitment into water column when the reproductive ability of the population diminished rather than to contribute to an increase of the planktonic population rapidly in their favorable seasons.
URI: http://hdl.handle.net/2261/5656
ISSN: 13493000
出現カテゴリ:Coastal Marine Science
Coastal Marine Science

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