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不同环境模态下空间分辨率对北太平洋柔鱼CPUE标准化的影响
魏广恩, 陈新军
上海海洋大学海洋科学学院
摘要:
CPUE常被假设与渔业资源量成正比而被应用于渔业资源评估与管理中,不同的环境模态下,所选取的空间分辨率对CPUE的标准化会产生影响,从而影响对该渔业资源丰度的评价。本研究运用广义加性模型(Generalized Additive Model,GAM), 对我国在北太平洋鱿钓渔业数据进行CPUE标准化。根据北太平洋环境的差异,以160°E为界将其划分为不同的环境模态。分别对两种模态下三种空间尺度(0.25°×0.25°、0.5°×0.5°、1°×1°)的名义CPUE进行标准化,得到各自的最适GAM模型。比较不同环境模态下,各因素对CPUE标准化产生的影响;相同环境模态下,不同空间尺度对CPUE标准化产生的影响。结果表明:不同环境模态下,对CPUE标准化产生影响的变量差异较大:160°E以西海域分别为年、纬度、SST以及交互项年与纬度、月与纬度;160°E以东海域分别为纬度、年与纬度的交互项、月与纬度的交互项。同一环境模态下,不同的空间尺度最适GAM模型对CPUE标准化结果不同,根据均方误差选取0.5°×0.5°和0.25°×0.25°分别为160°E东、西海域CPUE标准化的最适空间尺度。因此,在对北太平洋柔鱼商业性渔获数据进行标准化时,需要考虑因不同的环境模态以及不同的空间尺度而导致的CPUE标准化所出现的差异。
关键词:  北太平洋  柔鱼  广义加性模型  CPUE标准化  空间分辨率
DOI:
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基金项目:国家863计划(2012AA092303);国家发改委产业化专项(2159999);上海市科技创新行动计划
Impacts of spatial resolution under different environment modes on CPUE standardization in North Pacific Ocean
Wei Guang’en, Chen XinJun
College of Marine Sciences of Shanghai Ocean University Shanghai
Abstract:
CPUE is usually assumed to be proportional to the fishery resources and is applied to fishery stock assessment and management. The selected spatial resolution can affect standardized CPUE under different environment modes, and affect the evaluation of the fisheries resource abundance. In this study, we use the Generalized Additive Model (GAM) to standardize CPUE in the fishery data collected by the Chinese squid-jigging fleets in the North Pacific Ocean. According to the different environment of the North Pacific Ocean, it is divided into different environmental modes by 160°E. The nominal CPUE of three spatial scales (0.25°×0.25°, 0.5°×0.5°, and 1°×1°) under two modes were standardized to obtain the optimal GAM models respectively. Comparing the effects of various factors on CPUE standardization under different environment modes, and the impact of different spatial scales on CPUE standardization under the same environment mode. The results show that under different environment modes, the variables that have an important impact on CPUE standardization are different. The west waters of 160°E is the year, latitude, SST and the interactive term year and latitude, month and latitude; the east waters of 160°E is the latitude, and the interaction term year and latitude, month and latitude. Under the same environment mode, different spatial scales are optimal for GAM models with different CPUE standardization results. According to the mean square error, 0.5°×0.5°and 0.25°×0.25° are selected as the optimal spatial scales for CPUE standardization in the east and west waters of 160°E, respectively. Therefore, it is necessary to consider the differences in CPUE standardization caused by different environment modes and different spatial scales when standardizing the commercial catch data of North Pacific Ocean.
Key words:  North Pacific  Ommastrephes bartramii  generalized additive model  CPUE standardization  spatial resolution
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