东南太平洋智利竹筴鱼栖息地指数的比较研究

根据2000~2007年度东南太平洋智利竹筴鱼的商业捕捞数据,结合海洋环境数据(SST,SSA,SSHG以及等温层深度),运用4种关联建模方法计算其栖息地指数,并使用Surffer 8.0软件绘制出HSI的空间分布图。通过2008年度的捕捞数据进行验证,结果表明4种模型的结果存在明显差异:采用算术平均法和几何平均法时,主要产量分布在0.6HSI0.9的区域;采用最大值法时,主要产量集中在0.8HSI1.0的区域;采用最小值法时,主要产量分布在0.3HSI0.6的区域。通过4种模型的验证结果比较,本文认为算术平均法和几何平均法能较好地反映东南太平洋智利竹筴鱼的中心渔场位置以及分布特征。

A comparative study on habitat suitability index of Chilean Jack Mackerel in Southeast Pacific Ocean

Based on the commercial fishing data of Chilean Jack Mackerel in Southeast Pacific from 2000 to 2007,the HSI(habitat suitability index) value was calculated with four conjunction modeling methods;and combined with oceanic environmental data,the spatial distribution map were drawn by suffer 8.0.By verifying these four models with fishing data of 2008,the results indicated apparent differences: when arithmetic mean model or geometric mean model was applied,the main yield of Jack Mackerel was distributed in the area where HSI ranges from 0.6 to 0.9;when maximum model was applied,the main yield was distributed in the area where HSI ranges from 0.8 to 1.0;and when minimum model was applied,the main yield was distributed in the area where HSI ranges from 0.3 to 0.6.By comparing the verified results of these four modeling methods,the study confirmed that both Arithmetic mean model and geometric mean model were good indicators of central fishing ground and distribution characters of Chilean Jack Mackerel,which could be helpful in fishery forecast.