Impacts of climatic and marine environmental variations on the spatial distribution of Ommastrephes bartramii in the Northwest Pacific Ocean
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摘要: 柔鱼为生态依赖性鱼种,在亚太沿岸各国具有巨大的商业利用价值。柔鱼主要栖息地北太平洋,经历着世界上最复杂的海洋气候环境条件,如太平洋年代际涛动(PDO)。根据1995-2011年我国鱿钓船生产统计数据和环境数据,分析了气候和海洋环境变化对柔鱼空间分布的影响。柔鱼渔场经度重心(LONG)和纬度重心(LATG)季节和年间变化显著。纬度重心主要分布在适宜的环境范围内。研究发现,纬度重心年间的南北移动主要与PDO以及SST和SSH相关,MLD对柔鱼空间分布的影响具有局限性。PDO暖期时,SST偏冷以及SSH偏低,导致渔场纬度重心向南移动; PDO冷期时,SST偏暖以及SSH偏高,导致渔场纬度重心向北移动。本文构建的回归模型帮助理解和预测柔鱼渔场的分布,有助于有效的渔业资源管理。Abstract: Ommastrephes bartramii is an ecologically dependent species and has great commercial values among the Asia-Pacific countries. This squid widely inhabits the North Pacific, one of the most dynamic marine environments in the world, subjecting to multi-scale climatic events such as the Pacific Decadal Oscillation (PDO). Commercial fishery data from the Chinese squid-jigging fleets during 1995-2011 are used to evaluate the influences of climatic and oceanic environmental variations on the spatial distribution of O. bartramii. Significant interannual and seasonal variability are observed in the longitudinal and latitudinal gravity centers (LONG and LATG) of fishing ground of O. bartramii. The LATG mainly occurred in the waters with the suitable ranges of environmental variables estimated by the generalized additive model. The apparent north-south spatial shift in the annual LATG appeares to be associated with the PDO phenomenon and is closely related to the sea surface temperature (SST) and sea surface height (SSH) on the fishing ground, whereas the mixed layer depth (MLD) might contribute limited impacts to the distribution pattern of O. bartramii. The warm PDO regimes tend to yield cold SST and low SSH, resulting in a southward shift of LATG, while the cold PDO phases provid warm SST and elevated SSH, resulting in a northward shift of LATG. A regression model is developed to help understand and predict the fishing ground distributions of O. bartramii and improve the fishery management.
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