摘要:
根据2001年～8月对位于39°～43°N,152°E～171°W的北太平洋鱿鱼渔场进行的水温、盐度、叶绿素a、浮游植物和鱿鱼捕捞等的调查结果,主要分析北太平洋鱿鱼渔场表层叶绿素a分布特点及其与环境因子、中心渔场的关系.分析结果表明,调查区表层叶绿素a含量变化为0.03～0.32 mg/m3,平均为0.13 mg/m3,其中中部渔场表层叶绿素a含量值最大,东部渔场次之,西部渔场最低;调查海域表层叶绿素a含量分布与表层温度、盐度存在较好的对应关系,叶绿素a含量高值区对应高温区,冷涡区含量最低,暖涡区含量最高;叶绿素a含量随盐度的增加而增加;在西部、中部、东部渔场,表层叶绿素a含量与浮游植物数量呈正相关关系;表层叶绿素a的分布与鱿鱼中心渔场存在较好的对应关系,中心渔场主要位于0.1 mg/m3叶绿素a等值线舌状部分或叶绿素a水平梯度较大处,渔场中心的叶绿素a值大于0.1 mg/m3.叶绿素a分布与环境要素及渔场的相关性分析表明叶绿素a可作为鱿鱼渔场分析中的一个重要参考指标.
Abstract:
On the basis of the investigating results of chlorophylla,water temperature,salinity,phytoplankton and squid fishing in the squid fishing ground(39°~43°N,152°E~171°W)of the northern Pacific Ocean during June to August of 2001,The distributional characteristics of surface chlorophylla and relation to the environmental factors and squid fishing ground were mainly analyzed.The analyzing results show that the content of surface chlorophylla in the investigating area is between 0.03 and 0.32 mg/m3,mean value is 0.13 mg/m3.Among them,the content of surface chlorophylla in the middle part fishing ground is the biggest,the second is the in the eastern-part and the lowest is in the western-part.There is a good relationship of the distributions of surface chlorophylla contents with water temperature and salinity in the survey area.The high chlorophylla content is located in the region with high temperature,the content is the lowest in the cold eddy and the highest in the warm eddy.The chlorophylla content increases with increasing of salinity.The surface chlorophylla content has a positive relationship with the phytoplankton in the west,middle and east fishing grounds.The distribution of surface chlorophylla also exits a better relation with the middle part fishing ground of squid which mainly is located in the tongue part of 0.1 mg/m3 of isopleth and the maximum gradient belt.The values of the surface chlorophylla in the middle part fishing ground were more than 0.1 mg/m3.The relative analyses of distributional of chlorophylla with the environmental factors and fishing ground indicate that it may be as an important reference index in the study of squid fishing grounds.
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