Relationship between spatial and temporal distribution of jumbo flying squid Dosidicus gigas off Peru and sea surface temperature
Jumbo flying squid Dosidicus gigas is a pelagic and economically important squid species widely distributed off Peru.The purposes of this study were to understand the relationship between spatio-temporal fishing grounds of D.gigas and environmental conditions,and to provide a scientific basis for the sustainable utilization and management of D.gigas resources.Based on the fisheries data of D.gigas in the southeast Pacific Ocean off Peru from September to December,2006 thorough 2015 provided by National Data Center of Distant-water Fisheries of China,in this study,we determined the position of longitudinal and latitudinal gravity center of fishing ground,and quantified the temporal and spatial changes of fishing ground.In addition,the cluster analysis on the fishing ground gravity centers was performed.The relationship between fishing effort and sea surface temperature(SST)was exam-ined based on frequency distribution analysis and the influence of SST on the changes of fishing ground gravity centers was further evaluated.The responses of fishing ground gravity centers to the La Nina and El Nino events were finally explored.Significant monthly and interannual variations were found in the longitudinal and latitudinal gravity centers of the fishing ground.Cluster analysis divided the fishing ground gravity centers into three categories.The fishing effort distribution in the longitude,latitude and SST showed a large difference from month to month.Compared with the El Nino year(2015),the SST on the fishing ground in the La Nina year(2007)was lower,leading to the northwestward shift of the most preferred temperature front for D.gigas.Therefore,the gravity centers of fishing ground in 2007 moved northwestward.The results indicated that spatio-temporal distribution of D.gigas was closely related to large-scale climate variability-induced SST change.
Dosidicus gigasLa Nina and El Nino eventsea surface temperatureSoutheast Pacific O-ceangravity center of fishing ground
NETL
NSTL
万方数据
