Seasonal and Interannual Variations in the Abundance of Jellyfish in A
Plankton Benthos Res 8(3): 124–133, 2013 Plankton & Benthos Research © The Plankton Society of Japan Seasonal and interannual variations in the abundance of jellyfish in a southern coastal waters of Iyo-Nada, Japan: Influence of cyclonic gyre transport 1, 2 3 4 ATSUSHI KANEDA *, NAOKI FUJII , JUNICHI OHYAMA , DAISUKE TAKAHASHI , 5 3 FUSAICHI YAMAMOTO & HIDETAKA TAKEOKA 1 Faculty of Marine Bioscience, Fukui Prefectural University, 1–1, Gakuen, Obama, Fukui 917–0003, Japan 2 Institute of Lowland and Marine Research, Saga University, Honjo 1, Saga 840–8502, Japan 3 Center for Marine Environmental Studies, Ehime University 2–5, Bunkyo, Matsuyama, Ehime 790–8755, Japan 4 Graduate School of Agricultural Science, Tohoku University, 1–1 Amamiya-machi, Tsutsumidori, Aoba-ku, Sendai, Miyagi 981–8555, Japan 5 Yonden Consultants Co., Inc., 1007–3 Mure, Mure, Takamatsu, Kagawa 761–0121, Japan Received 15 November 2012; Accepted 21 May 2013 Abstract: The longterm data on daily abundance of jellyfish (mostly Aurelia aurita) trapped in the intake gates of the Ikata Nuclear Power Plant on the south coast of the central part of Iyo-Nada in the Seto Inland Sea, Japan was examined for a 14-year period (April 1998 to March 2012) in relation to environmental variables, i.e. temperature, salinity, and residual current, of which the last was measured in February, May, August and November. The jellyfish abundance, expressed as wet weight, generally increased in April, reached a maximum in September, markedly decreased from October to November, and was very low or null from December to March. The annual mean jellyfish abundance varied markedly.
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