Establishment of forecasting model of the abundance index for chub mackerel (Scomber japonicus) in the northwest Pacific Ocean based on GAM
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摘要: 日本鲭(Scomber japonicus)是西北太平洋重要的鱼类资源之一,科学预测日本鲭的资源丰度有利于其资源的合理开发和利用。本研究依据日本渔业机构提供的1987–2012年日本鲭太平洋群体的资源量数据,结合产卵场和渔场的海洋环境数据以及气候因子,使用广义加性模型对影响日本鲭太平洋群体的海洋环境和气候因子进行分析,筛选出有显著影响的因子并建立该群体的资源量预测模型。结果表明,与该群体资源量有显著关系的影响因子有:北极涛动指数、太平洋年代际振荡指数、渔场海表面高度、渔场海表面盐度和渔场海表面温度。基于赤池信息准则筛选出的4个资源量预测模型分析表明,包含北极涛动指数、渔场海表面高度和渔场海表面温度的模型有较好的预测效果,该模型的验证结果也通过了t检验(P<0.05),可用于日本鲭太平洋群体资源量的预测。Abstract: Chub mackerel (Scomber japonicus) is one of the important fishery resources in the northwest Pacific Ocean. Building a scientific forecast model of abundance index to this species is beneficial for its exploitation and utilization. In this study, based on the biomass data of the Pacific-cohort of Scomber japonicus during 1987–2012 obtained from Japan Fisheries Institution, as well as the marine environmental data and climatic data of spawning ground and fishing ground, we analyzed the relationship between the environmental and climatic factors and the biomass of this cohort. The significant factors were selected and the forecast models were established by using the generalized addictive models (GAM). The result shows the significant factors affecting the biomass of this cohort conclude the Arctic Oscillation index (AOI), Pacific Decadal Oscillation index (PDOI) and sea surface height (SSH2), sea surface salinity (SSS2) and sea surface temperature (SST2) both in the fishing ground. Result based on Akaike’s Information Criterion (AIC) suggests that the model 1 which included AOI, SSH2 and SST2 has the optimal model impacts. The model 1 passes the significant test (P<0.05) and the t test (P<0.05) is also passed based the validation result of model 1. Therefore, we suggest that this model can be used to forecast the abundance of the Pacific-cohort of Scomber japonicus.
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表 1 1987-1999年各环境因子和气候因子与日本鲭资源量的GAM检验
Tab. 1 Test of GAM between the environmental or climatic factors and the biomass during 1987–1999
影响因子 P值 R2 AOI 0.05* 0.24 NI 0.18 0.24 PDOI 2.64×10–5* 0.76 SOI 0.15 0.27 产卵场SSH(SSH1)/cm 0.30 0.17 渔场SSH(SSH2)/cm 0.03* 0.68 产卵场SSS(SSS1) 0.09 0.16 渔场SSS(SSS2) 3.00×10–3* 0.96 产卵场SST(SST1)/℃ 0.10 0.16 渔场SST (SST2)/℃ 1.00×10–3* 0.86 黑潮潮差/m 0.60 0.06 亲潮春季平均面积/m2 0.28 0.20 注:*表示在显著性水平α=0.05(双侧)上显著相关。 表 2 1987-1999年各关键影响因子之间的回归分析
Tab. 2 Regression analysis of significant factors during 1987-1999
影响因子 P值 R2 AOI,PDOI 0.07 0.28 AOI,SSH2 0.49 0.04 AOI,SST2 0.14 0.19 AOI,SSS2 0.42 0.06 PDOI,SSH2 4.37×10–3* 0.54 PDOI,SST2 7.37×10–4* 0.66 PSO,SSS2 0.73 0.01 SSH2,SST2 0.06 0.28 SSH2,SSS2 0.49 0.04 SST2,SSS2 0.93 7.08×10–4 注:*表示在显著性水平α=0.05(双侧)上显著相关。 表 3 1987-1999年基于环境因子和气候因子的资源量预测模型
Tab. 3 Forecasting models of biomass based on environmental and climatic factors during 1987–1999
模型 AIC P值 (P<0.05) 调整后的R2 模型1 –90.892 55 2.80×10–5* 1.000 模型2 –79.380 89 4.41×10–3* 0.999 模型3 –47.796 14 6.22×10–9* 0.995 模型4 –24.670 12 9.97×10–8* 0.970 注:*表示在显著性水平α=0.05(双侧)上显著相关。 表 4 2000-2012年资源量的预测值和真实值之间的t检验
Tab. 4 t test between the predicted ln(Biomass) and the actual ln(Biomass) during 2000–2012
模型 t值 自由度 P值 (P<0.05) 模型1 2.97 18.33 8.08×10–3* 模型2 4.27 23.88 2.66×10–4* 模型3 1.63 20.90 0.12 模型4 1.01 20.73 0.33 注:*表示在显著性水平α=0.05(双侧)上显著相关。 -
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