Seasonal occurrence of the calanoid copepods from off Miho Key, Suruga Bay, central Honshu, Japan

摘要: Seasonal occurrence of calanoid copepods was investigated on the basis of48samples taken from April1979to June1980at a station off Miho Key in Suruga Bay,central Honshu,Japan.Samples were obtained by vertical hauls 30-m depth to surface with Norpac net. A total of109calanoid species,including 21species newly recorded bay,representing 41genera 19families identified.The copepod assemblage characterized high abundance cold-water neritic species winter spring,the warm-water summer,and many oceanic and diversity autumn. Among them,40species sampled abundantly frequently grouped into following 4types their seasonal cluster analysis excluding an outlier,Eucalanus subtenuis: (1)Autumn type (14oceanic 1neritic species):relatively abundant September November positively correlated water temperature.Oceanic species:Clausocalanus minor, Nannocalanus Eucalanus pileatus, E. subcrassus, Paracalanus aculeatus, Candacia catula,Acrocalanus gracilis,Undinula vulgaris, Calocalanus plumulosus, C. pavo, Temora discaudata, Calanopia Canthocalanus pauper Euchaeta rimana.Neritic species:Temora turbinata. (2)Autumn-Winter Type (10oceanic not only autumn but also (from December February). All are form.Acartia danae, denudatus, Clausocalanus furcatus, C.mastigophorus, Scolecithrix danae,Cosmocalanus darwini,Paraeuchaeta russelli,Lucicutia flavicornis, Pleuromamma gracilis P. piseki. (3)Winter-Spring (6oceanic 5neritic May negatively temperature most species.Oceanic species:Calanus jashnovi, arcuicornis,C.parapergens,C.pergens,Ctenocalanus vanus bipinnata.Neritic species: Centropages abdominalis, parvus s.l.,Acartia omorii, A. steueri Calanus sinicus. (4)Summer (1oceanic 2neritic species):Relatively June August all species:Centropages bradyi.Neritic Labidocera japonica tenuiremis. The differences among can be explained optimum distribution each species. On other hand, that resting-egg formation depending or food organisms predators,as suggested previous studies. 第3巻第1号(2005) 「海―自然と文化」東海大学紀要海洋学部 第3巻第1号 19-32頁(2005) Journal School Marine Science Technology,Vol.3 No.1 pp.19-32,2005 2005年5月16日受理 *1 株式会社 水土舎(Suidosha Co.Ltd.) *2 東海大学海洋学部(School Technology,Tokai University) *3 東海大学海洋学部非常勤講師(Tokai