광양만 동물플랑크톤 군집의 계절 변화

Abstract

This study was conducted bimonthly from June 2001 to June 2003 to investi-gate the seasonal variation of the zooplankton community in Gwangyang Bay. Zoo-plankton were collected at 9 stations using a NORPAC net from surface layer. The zoo-plankton community consisted of 47 taxa and the mean abundance was 6,205 inds. m-3during the survey period. The maximum abundance was observed to be 26,060inds. m-3in June 2002 and the minimum in August 2001 with 630 inds. m-3. Copepods were thepredominant constituent, wihich comprised 4.6 ~ 84.1% (mean 38.2%) of the total zoo-plankton abundance. Dominant species of copepods were Acartia omorii, Acartiaerythraea, Centropages abdominalis, Paracalanus parvus. Paracalanus parvus domi-nated from June 2001 to December 2002. A red tide causative dinoflagellate, Noctilucascintillans , dominated from June 2002 to February 2003. Acartia omorii and Cen-tropages abdominalis dominated in winter and spring seasons. While, Acartia erythraeadominated in summer and fall seasons. In June and August, Cladocerans and Cirripedlarvae dominated. The abundance of zooplankton according to the tidal cycle showedconsiderable fluctuations with a range of 2,768 ~ 15,856inds. m-3 (≒ 5.7 times).