Influence of sea surface temperature changes on Chilean jack mackerel( Trachurus murphyi)  habitat in the Southeast Pacific

SST changes%Southeast Pacific%Chilean jack mackerel%habitat area changes

According to Chilean jack mackerel ( Trachurus murphyi) fishery-dependent data and sea surface temperature (SST) by remote sensing during 2003 - 2011, the external method was used to build monthly habitat suitability index (HSI) based on fishing effort, CPUE and SST with the offset amplitude in latitude and longitude and the spreading area of habitat as the variation index. Then the monthly suitable SST ranges of Chilean jack mackerel were analyzed. The changes of the offset amplitude in longitude, latitude and habitat areas were discussed when the monthly SST increased and decreased respectively by 0.5 ℃, 1 ℃ and 2 ℃ based on monthly average SST during 2003 -2011. The results indicated that Chilean jack mackerel habitat had an obvious southward shifting tendency, and the area of habitat would decrease in May and August but increase in June and July with the increased SST. While SST declined, the Chilean jack mackerel habitat showed a trend to move northwards, and suitable habitat would increase. The research suggests that the idea of this article can be used to study how EI Nino and La Nina events affect Chilean jack mackerel habitat and its spatial distribution of fishing grounds in the Southeast Pacific.