Evaluating the impacts of El Nino intensity on interannual variation in spatio-temporal distribution of potential habitat for jumbo flying squid Dosidicus gigas in Southeast Pacific Ocean
The jumbo flying squid(Dosidicus gigas)is one of the largest cephalopods with high eco-nomical values,which is an important fishing target by Chinese squid-jigging fisheries.According to the sea surface temperature(SST)and sea surface height anomaly(SSHA)data obtained from 8°-20°S,95°-75°W off Peru from Sept,to Dec.during a period from 2006 to 2015,the weighted habitat suitabili-ty index model(HSI)was developed,and the optimal HSI model was selected and validated.Further-more,the optimal HSI model was used to predict the habitat suitability for D.gigas,the differences of spatial and temporal distribution in potential habitat of D.gigas in the years with El Nino events at different intensity were further examined.The fisheries data from Sept.to Dec.,2015,were used to validate the optimal model,and the model outputs exhibited a good prediction performance.The envi-ronmental conditions combined with spatial and temporal variations of potential habitats of D.gigas were compared between year 2006 with weak El Nino event and year 2015 with very strong El Nino e-vent.The results showed that relative to year 2015 with strong El Nino event,year 2006 with weak El Nino event experienced colder SST,lower SSH,and wider range of suitable SST and SSH.The envi-ronments in 2006 were favorable for squid survival,leading to a significant increase in suitable habitat in 2006.Our findings suggested that the impacts of El Nino events at different intensity on habitat suit-ability of D.gigas are dramatically different.The studies on evaluating climate variability on squid species in the future should consider the characteristics each anomalous climatic event.
Dosidicus gigasoffshore Peruhabitat suitability index modelEl Ninointensity
NETL
NSTL
万方数据
