Spatiotemporal distribution of offshore fishing grounds in Senegal and its relationship with environmental factors
To explore the spatiotemporal distribution of offshore fishing grounds in Senegal and its relationship with environmental factors,this study utilized the fishing log data from trawl fishing vessels in the offshore fishing grounds of Senegal from 2018 to 2020,employed fishery center of gravity analysis and geostatistical interpolation methods to investigate the spatiotemporal changes in Senegal's offshore fishing grounds.Additionally,by combining corresponding ocean remote sensing data(sea surface temperature SST,and chlorophyll-a Chl-a),a generalized additive model(GAM)was used to explore the relationship between catch per unit of fishing effort(CPUE)and spatiotemporal and environmental factors.The main conclusions were as follows:1)Temporally,the catch and CPUE in Senegal's offshore fishing grounds from 2018 to 2020 exhibited a trend of initial increase,followed by a decrease,and then a subsequent increase.Spatially,Senegal's offshore fishing grounds were primarily distributed in waters between 12°00′N to 16°00′N and 16°30′W to 18°30′W.The fishing ground center of gravity moved northward from January to June and returned to the southern fishing grounds from July to December,with minimal changes in the longitudinal direction;2)The accumulative deviance explanation of GAM model was 17.8％,with the year(Y)contributing the most at 5.83％,followed by longitude(Lon),month(M),and SST at 4.37％,3.90％,and 2.80％,respectively.Latitude(Lat)and Chl-a had the least contributions at 0.70％and 0.20％,respectively.The F-test indicated that the influences of Y,M,Lat,Lon,and SST on CPUE were significant(P＜0.05),while the influence of Chl-a was not significant(P＞0.05);3)SST was the most influential environmental factor on CPUE,and the optimal SST range was 22-24 ℃,the optimal Chl-a concentration range was 2-3 mg·m-3.The study can provide scientific basis for the understanding of dynamics of offshore fishing grounds in Senegal,assessing and sustainably utilizing fishery resources in the area.
offshore fishing grounds of SenegalCPUEGAMspatiotemporal variationenvironmental factor
万方数据
维普
