Detection of spatial hot spots and variation for the neon flying squid Ommastrephes bartramii resources in the northwest Pacific Ocean

• Published in: Chinese journal of oceanology and limnology Vol. 35; no. 4; pp. 921 - 935
• Main Author: 冯永玖 陈新军 刘艳
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.07.2017; Springer Nature B.V
• Subjects: Aquaculture and Fisheries; Area; Cephalopod fisheries; Chlorophyll; Chlorophyll a; Climate; Climate change; Climate effects; Clusters; Cold; Data analysis; Data processing; Detection; Distribution; Earth and Environmental Science; Earth Sciences; Exploitation; Fishery data; Fishing; Fishing grounds; Fishing zones; Flight; Hot spots; Identification; Jigging; Management; Marine molluscs; Methods; Neon; Oceanography; Oceans; Sea surface; Sea surface temperature; Spatial analysis; Spatial distribution; Spots; Squid; Surface temperature; Sustainability; Temperature effects; 乌贼; 全球气候变化; 变化检测; 柔鱼; 空间数据分析; 西北; 资源空间; 霓虹灯; Pacific Ocean; spatial autocorrelation; exploratory spatial data analysis (ESDA); spatial hot spot; variation assessment; northwest Pacific Ocean
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-017-6036-2

With the increasing effects of global climate change and fishing activities, the spatial distribution of the neon flying squid （Ommastrephes bartramii） is changing in the traditional fishing ground of 150°- 160°E and 38°-45°N in the northwest Pacific Ocean. This research aims to identify the spatial hot and cold spots （i.e. spatial clusters） of O. bartramii to reveal its spatial structure using commercial fishery data from 2007 to 2010 collected by Chinese mainland squid-jigging fleets. A relatively strongly-clustered distribution for O. bartramii was observed using an exploratory spatial data analysis （ESDA） method. The results show two hot spots and one cold spot in 2007 while only one hot and one cold spots were identified each year from 2008 to 2010. The hot and cold spots in 2007 occupied 8.2% and 5.6% of the study area, respectively; these percentages for hot and cold spot areas were 5.8% and 3.1% in 2008, 10.2% and 2.9% in 2009, and 16.4% and 11.9% in 2010, respectively. Nearly half （〉45%） of the squid from 2007 to 2009 reported by Chinese fleets were caught in hot spot areas while this percentage reached its peak at 68.8% in 2010, indicating that the hot spot areas are central fishing grounds. A further change analysis shows the area centered at 156°E/43.5°N was persistent as a hot spot over the whole period from 2007 to 2010. Furthermore, the hot spots were mainly identified in areas with sea surface temperature （SST） in the range of 15-20℃ around warm Kuroshio Currents as well as with the chlorophyll-a （chl-a） concentration above 0.3 mg/m^3. The outcome of this research improves our understanding of spatiotemporal hotspots and its variation for O. bartramii and is useful for sustainable exploitation, assessment, and management of this squid.