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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 of D. gigas through fishing logs from September to December in 2018−2021, combined with environmental factors, including surface temperature (SST), sea surface 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 northwest to the southeast from September to December. The results of random forest model analysis showed that, the impact 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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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