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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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Abstract

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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Authors and Affiliations

  1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China

    Yongjiu Feng, Xinjun Chen, Feng Gao & Yang Liu

  2. Laboratory for Marine Fisheries Science and Food Production Processes, Qingdno National Laboratory for Marine Science and Technology, Qingdao, 266235, China

    Yongjiu Feng

  3. National Distant-water Fisheries Engineering Research Center, Shanghai Ocean University, Shanghai, 201306, China

    Yongjiu Feng, Xinjun Chen & Feng Gao

  4. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources (Shanghai Ocean University), Ministry of Education, Shanghai, 201306, China

    Yongjiu Feng, Xinjun Chen & Feng Gao

Authors
  1. Yongjiu Feng
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  2. Xinjun Chen
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  3. Feng Gao
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  4. Yang Liu
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Correspondence to Xinjun Chen.

Additional information

Foundation item: The National Natural Science Foundation of China under contract No. 41406146; the Open Fund from Laboratory for Marine Fisheries Science and Food Production Processes at Qingdao National Laboratory for Marine Science and Technology of China under contract No. 2017-1A02; Shanghai Universities First-class Disciplines Project-Fisheries (A).

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Feng, Y., Chen, X., Gao, F. et al. 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. Acta Oceanol. Sin. 37, 67–76 (2018). https://doi.org/10.1007/s13131-018-1212-6

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  • DOI: https://doi.org/10.1007/s13131-018-1212-6

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