中国水产科学Issue(5)：1027-1035,9.DOI:10.3724/SP.J.1118.2015.15099
北部湾西北部饵料浮游动物季节变化及其与鱼卵、仔稚鱼的关系
Seasonal variation in zooplankton characteristics and their relation-ship with fish eggs and larvae in the Northwest Beibu Gulf
摘要
Abstract
This paper addresses the spatiotemporal distribution characteristics of zooplankton abundance and seasonal changes in fish egg and larval density based on data from four oceanographic surveys in Guangxi offshore waters in the Northwest Beibu Gulf during the winter, spring, summer, and autumn of 2012. Additionally, the relationships between en-vironmental factors, water masses, and, in particular, zooplankton were explored. The results revealed that zooplankton abundances were 337.35 ind/m3, 280.01 ind/m3, 4.32 ind/m3, and 14.78 ind/m3 in the winter, spring, summer, and autumn, respectively. The zooplankton numbers between spring and summer, and between autumn and winter significantly changed, but remained steady between winter and spring, and summer between and autumn. The peak zooplankton abundance pe-riod in this water body was winter, which occurs a season before that in the East China Sea. In the investigation area, Evynnis cardinalis, an economically important fish species, exhibited obvious seasonal distribution characteristics:Capture rates in winter and spring were higher than those in summer and autumn, which was consistent with the seasonal variation characteristics of zooplankton. High quantities of zooplankton in the winter and spring provided sufficient food to supple-ment fish populations and therefore provide a valuable resource for fish reproduction and growth. Northwest Beibu Gulf is mainly affected by coastal water, offshore current and mixed water. Coastal water is composed of sea water and mixed water that is diluted by terrestrial runoff to the sea. A high salinity offshore current that is composed of offshore water runs into the Beibu Gulf from the bay mouth. Mixed water composed of coastal and offshore water converges in the continental shelf area. In the winter and spring, zooplankton distribution characteristics were similar;higher numbers of zooplankton were recorded in gulf and coastal waters than in inshore waters. However, zooplankton abundance in inshore waters was significantly higher than those in gulf and coastal waters during the summer and autumn. Sea water and mixed water in this area are affected by seasonal changes in coastal waters;the dominant species succession consisted of warm temperate neritic species in spring, warm water offshore species in summer and autumn, and warm water neritic species in winter. The dominant species were Penilia avirostris, Calanus sinicus, and Flaccisagitta enflata in the winter, spring, and summer and autumn, respec-tively. The ecological adaptability of the main dominant species determined the spatial and temporal distribution of these species, which in turn determined the zooplankton distribution characteristics. The combination of internal (ecological adaptation) and external (seasonal environmental change) factors resulted in the zooplankton distribution variation observed in this study. These factors also likely drove seasonal species succession in this area. Zooplankton are a vital food source for most fish species during their larval periods. Variations in zooplankton distribution and quantity can be either directly or indirectly affected by fish inges-tion, migratory and catch behavior, and feeding period. Fish egg and larval densities were 6.83 ind/m3, 3.09 ind/m3, 0.05 ind/m3, and 0.20 ind/m3 from winter to autumn;seasonal trends were highly consistent with those of zooplankton. A strong positive cor-relation indicates that rich food sources of zooplankton facilitate both fish egg and larval development.关键词
北部湾/浮游动物/季节变化/水团/鱼卵/仔稚鱼Key words
Beibu Gulf/zooplankton/seasonal variation/water masses/fish eggs/fish larvae分类
农业科技引用本文复制引用
阙江龙,徐兆礼,孙鲁峰..北部湾西北部饵料浮游动物季节变化及其与鱼卵、仔稚鱼的关系[J].中国水产科学,2015,(5):1027-1035,9.基金项目
国家自然科学基金项目(41176131) （41176131）
国家973计划项目(2010CB428705) （2010CB428705）
