南极磷虾资源丰度及其与海冰和表温的关系

根据2003—2010年南极磷虾48.2区产量数据结合该区域海冰和SST数据，分析了磷虾产量的时空分布，探讨了海冰和SST对南极磷虾资源丰度的影响。结果表明，48.2区的渔汛期为3—7月，主要作业时间为2—8月，产量约占该渔区年产量的99.3%。回归分析表明，磷虾CPUE变动与海冰和SST面积变化关系明显。磷虾CPUE与海冰总面积年间变化呈现显著的负相关(R=0.80)，与海冰密集度为90%—100%的海冰面积负相关系数最大(R=0.84)；年内变化关系则为一元二次多项式回归模型，CPUE随海冰面积的递增先增大后减小，与海冰密集度为60%—70%的海冰面积相关系数最大(R=0.94)。磷虾CPUE与SST为-2—3℃时的总面积年间变化负相关性不显著(R=0.46)，但与SST为1—2℃时的面积呈现显著的负相关(R=0.91)；年内变化关系也为一元二次多项式回归模型，CPUE随SST面积的递增先增大后减小，与SST为0—1℃时的面积相关系数最大(R=0.97)。

THE ABUNDANCE INDEX OF ANTARCTIC KRILL AND ITS RELATIONSHIP TO SEA ICE AND SEA SURFACE TEMPERATURE

According to Antarctic krill catch data from 1997 to 2010 in Area 48.2 and sea ice and SST data, this paper analyzed the spatio-temporal distribution of krill catch and discussed the influence of sea ice and SST on abundance of Antarctic krill. The results show that annual krill catch in Area 48.2 dominatingly came from March to July, and mainly fishing time was from February to August, and the production during this period accounting for about 99.3% of the annual catch. Regression analysis shows that CPUE of Antarctic krill had obvious relations with the area of sea ice and SST. CPUE was negatively related with the total area of sea ice among years (R=0.80), and the correlation is maximum (R=0.84) with the area of sea ice where concentrations were between 90% and 100%; they had a second polynomial regression model among months, and CPUE increased firstly then decreased with the increasing of the area of sea ice, and the correlation is maximum (R=0.94) with the area of sea ice where concentrations were between 60% and 70%. The negative correlation among years was unremarkable between CPUE and the area of SST where the values were between -2℃ and 3℃(R=0.46), but CPUE had significant negative correlation with the area of SST where the values were between 1℃ and 2℃ (R=0.91); they also had a second polynomial regression model among months, and CPUE increased firstly then decreased with the increasing of the area of SST, and the correlation is maximum (R=0.97) with the area of sea ice where concentrations were between 0℃ and 1℃.