Impacts of changing scale on Getis-Ord Gi* hotspots of CPUE:a case study of the neon flying squid (Ommastrephes bartramii)in the northwest Pacific Ocean

FENG Yongjiu; CHEN Xinjun; GAO Feng; LIU Yang

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Impacts of changing scale on Getis-Ord Gi* hotspots of CPUE:a case study of the neon flying squid (Ommastrephes bartramii)in the northwest Pacific Ocean

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We examined the scale impacts on spatial hot and cold spots of CPUE for Ommastrephes bartramii in the northwest Pacific Ocean. The original fishery data were tessellated to 18 spatial scales from 5′×5′ to 90′×90′ with a scale interval of 5′ to identify the local clusters. The changes in location, boundaries, and statistics regarding the Getis-Ord Gi* hot and cold spots in response to the spatial scales were analyzed in detail. Several statistics including Min, mean, Max, SD, CV, skewness, kurtosis, first quartile(Q1), median, third quartile(Q3), area and centroid were calculated for spatial hot and cold spots. Scaling impacts were examined for the selected statistics using linear, logarithmic, exponential, power law and polynomial functions. Clear scaling relations were identified for Max, SD and kurtosis for both hot and cold spots. For the remaining statistics, either a difference of scale impacts was found between the two clusters, or no clear scaling relation was identified. Spatial scales coarser than 30′ are not recommended to identify the local spatial patterns of fisheries because the boundary and locations of hot and cold spots at a coarser scale are significantly different from those at the original scale.

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《海洋学报：英文版》 |2018年第5期|67-76|共10页
作者
FENG Yongjiu; CHEN Xinjun; GAO Feng; LIU Yang;
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作者单位

College of Marine Sciences;

Shanghai Ocean University;

Laboratory for Marine Fisheries Science and Food Production Processes;

Qingdao National Laboratory for Marine Science and Technology;

National Distant-water Fisheries Engineering Research Center;

Shanghai Ocean University;

Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources (Shanghai Ocean University);

Ministry of Education;

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原文格式 PDF
正文语种 chi
中图分类原子间的作用、激发与电离;热带气象;
关键词
西北太平洋; 可伸缩; 补给; 官方; 聚类识别; 案例; 空间模式; CPUE;

Impacts of changing scale on Getis-Ord Gi* hotspots of CPUE:a case study of the neon flying squid (Ommastrephes bartramii)in the northwest Pacific Ocean

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