Relationship between abundance of Dosidicus gigas and environment factors in the offshore waters of Peru based on random forest model
Dosidicus gigas is an oceanic economic fish in the offshore waters of Peru,and its abundance is greatly affected by environmental factors.This study obtained the abundance ofD.gigas through fishing logs from Septem-ber to December in 2018-2021,combined with environmental factors,including surface temperature(SST),sea sur-face salinity(SSS),sea surface height(SSH)and chlorophyll a concentration(Chl a)acquired from satellite remote sensing.Random forest model and ArcGIS were applied to analyze the correlations between the abundance of D.gigas and environmental factors.Results showed that the distribution of the center of gravity of fishing ground was concentrated in the range of 13°-21°S,76°-87°W during 2018-2021,and the center of gravity shifted from northw-est to the southeast from September to December.The results of random forest model analysis showed that,the im-pact of environmental factors on the abundance and distribution of D.gigas in the offshore waters of Peru varied among different months.The optimal SST ranged from 16.3℃ to 18.5℃,The optimal SSS ranged from 35.1 to 35.4,the optimal SSH ranged from 0.55 m to 0.60 m,the optimal Chla concentration ranged from 0.18 mg/m3 to 0.46 mg/m3.The predicted CPUE values derived from the random forest model were generally consistent with the nominal CPUE distribution,indicating the suitability of the random forest model for analyzing the relationship between D.gigas and environmental factors in the offshore waters of Peru.This study is of great significance for understanding the resource dynamics of D.gigas and guiding its production.
万方数据
维普
