Effect of spatial and temporal scales on habitat suitability modeling: A case study of Ommastrephes bartramii in the northwest pacific ocean

2014 ◽  
Vol 13 (6) ◽  
pp. 1043-1053 ◽  
Author(s):  
Caixia Gong ◽  
Xinjun Chen ◽  
Feng Gao ◽  
Siquan Tian
Keyword(s):  
Pacific Ocean ◽  
Habitat Suitability ◽  
Northwest Pacific ◽  
Ommastrephes Bartramii ◽  
Temporal Scales ◽  
Northwest Pacific Ocean ◽  
Habitat Suitability Modeling ◽  
Spatial And Temporal Scales ◽  
The Northwest Pacific Ocean

Habitat suitability modelling revealing environmental-driven abundance variability and geographical distribution shift of winter–spring cohort of neon flying squid Ommastrephes bartramii in the northwest Pacific Ocean

2019 ◽  
Vol 76 (6) ◽  
pp. 1722-1735 ◽  
Author(s):  
Wei Yu ◽  
Xinjun Chen ◽  
Yang Zhang ◽  
Qian Yi
Keyword(s):  
Pacific Ocean ◽  
Habitat Suitability ◽  
Sea Surface ◽  
Height Anomaly ◽  
Northwest Pacific ◽  
Suitable Habitat ◽  
Ommastrephes Bartramii ◽  
Catch Per Unit Effort ◽  
Northwest Pacific Ocean ◽  
The Northwest Pacific Ocean

Abstract To identify climate-related habitat changes and variations in abundance and distribution of Ommastrephes bartramii in the northwest Pacific Ocean, an habitat suitability index (HSI) model was developed in this study including sea surface temperature (SST), photosynthetically active radiation (PAR), and sea surface height anomaly (SSHA). The catch-per-unit-effort (CPUE) of O. bartramii gradually decreased between 2006 and 2015, and the latitudinal gravity centres (LATG) of the fishing effort shifted southward. Correlation analyses suggested that CPUE was positively related to SST, PAR, and the areas of suitable and optimal habitat, but negatively correlated with SSHA and the percentages of poor habitat. A significantly positive correlation was found between the LATG and the average latitude of the most preferred SST, PAR, and the average latitude of the area with an HSI between 0.9 and 1.0. From 2006 to 2015, the annual declined CPUE was highly consistent with the increase in areas of poor habitat and the reduction in areas of suitable and optimal habitats. The south-approaching LATG coincided with the southward migration pattern of the latitude of the HSI area in the range of 0.9–1.0. Moreover, compared to the El Niño events, the La Niña events, and normal climate condition yielded enlarged suitable habitat areas for O. bartramii, and the LATG moved further north.

scholarly journals Stock assessment of the western winter-spring cohort of Ommastrephes bartramii in the Northwest Pacific Ocean using a Bayesian hierarchical DeLury model based on daily natural mortality during 2005-2015

2019 ◽  
Vol 83 (2) ◽  
pp. 155 ◽  
Author(s):  
Qi Ding ◽  
Jie Cao ◽  
Xinjun Chen
Keyword(s):  
Pacific Ocean ◽  
Environmental Conditions ◽  
Northwest Pacific ◽  
Natural Mortality ◽  
Ommastrephes Bartramii ◽  
Northwest Pacific Ocean ◽  
Bayesian Hierarchical ◽  
Stock Size ◽  
Neon Flying Squid ◽  
The Northwest Pacific Ocean

The purpose of this study was to evaluate the effect of the intensive commercial jigging fishery on the western winter-spring cohort of neon flying squid (Ommastrephes bartramii) in the Northwest Pacific Ocean and to estimate the exploitation status of this stock during the period 2005-2015. We applied a Bayesian hierarchical DeLury depletion model to the Chinese jigging fisheries data to estimate the stock abundance and catchability for each year, and sensitivity analysis on daily natural mortality (M) was conducted. The results indicated that M values had great impacts on the overall estimates of stock size. Initial annual population sizes varied from 66 to 662 million individuals with the M value of 0.003-0.01 per day during the study period. O. bartramii suffered from a certain degree of overexploitation in 2008. The proportional escapement values (M=0.003-0.01) were 8.94% to 19.82% in 2008, with an average of 13.74%, which may have led to a low abundance of O. bartramii and annual catch since 2009. As short-lived ecological opportunists, O. bartramii are extremely sensitive to changes in multi-scale environmental conditions, especially when anomalous environmental conditions occur, and significant between-year variations in the initial abundance resulted in O. bartramii suffering from a certain degree of overexploitation in 2010. Although the proportional escapement met the management target of 40% from 2011 to 2015, the stock size and annual catch still fluctuated at relatively low levels. Improved knowledge of the influences of environmental conditions on abundance of the western winter-spring cohort of neon flying squid can contribute to the sustainable management of this stock.

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