基于HSI模型的印度洋大眼金枪鱼栖息地研究

Using HSI model for analyzing the habitat suitability of bigeye tuna(Thunnus obesus) in the Indian Ocean

根据日本商业性金枪鱼延绳钓生产数据,应用栖息地指数模型(HSI)和地理信息系统(G IS)图形显示技术对印度洋大眼金枪鱼的栖息地分布进行研究。研究结果表明:印度洋大眼金枪鱼最适合栖息的海域主要集中在70°E以东,15°S以北印度洋海域,栖息地指数值在0.75~1.00;而20°E^50°E,30°S^40°S海域以及65°E^120°E,20°S^40°S之间大部分海域的大眼金枪鱼HSI指数集中在0.25~0.50之间;其余海域的大眼金枪鱼HSI指数均分布在0.50~0.75之间。

In order to quantify spatial variations in the habitat suitability for the bigeye tuna based on data on CPUE and environmental factors in the Indian Ocean collected during 1975 to 1997, spatial models were developed with a Geographical Information System （GIS） technique. With habitat suitability index （HSI） model used to predict the spatial variation on bigeye tuna＇s distribution according to fluctuations on physical habitat factors. The result indicates that the higher HSI value concentrated in the region of the east of 70 ° E, and the north of 15 ° S with range from 0.75 to 1.0, most of the Indian Ocean were with the HST value from 0.5 to 0.75. and the HSI value on the east of South Africa and 25 °S -40°S, 70°E - 120°E was range from 0.25 - 0.5, there were no region with HSI lower than 0.25.