| YU Wei,CHEN Xinjun,CHEN Changsheng,ZHANG Yu. 2017. Impacts of oceanographic factors on interannual variability of the winter-spring cohort of neon flying squid abundance in the Northwest Pacific Ocean. Acta Oceanologica Sinica, 36(10):48－59 |
| Impacts of oceanographic factors on interannual variability of the winter-spring cohort of neon flying squid abundance in the Northwest Pacific Ocean |
| 西北太平洋环境变化对柔鱼冬春生群体资源丰度年间变化的影响 |
| Received:June 12, 2016 |
| DOI：10.1007/s13131-017-1069-0 |
| Key words:Ommastrephes bartramii squid abundance interannual variability PDO-CPUE relationship Kuroshio meandering meso-scale eddies |
| 中文关键词: 柔鱼 资源丰度 年间变化 PDO-CPUE关联 黑潮摆动 中尺度涡 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | YU Wei | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China | | | CHEN Xinjun | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China | xjchen@shou.edu.cn | | CHEN Changsheng | School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, MA 02744, USA | | | ZHANG Yu | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China | |
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| Abstract: |
| The neon flying squid Ommastrephes bartramii is an economically important species in the Northwest Pacific Ocean. The life cycle of O. bartramii is highly susceptible to climatic and oceanic factors. In this study, we have examined the impacts of climate variability and local biophysical environments on the interannual variability of the abundance of the western winter-spring cohort of O. bartramii over the period of 1995-2011. The results showed that the squid had experienced alternant positive and negative Pacific Decadal Oscillation (PDO) over the past 17 years during which five El Niño and eight La Niña events occurred. The catch per unit effort (CPUE) was positively correlated with the PDO index (PDOI) at a one-year time lag. An abnormally warm temperature during the La Niña years over the positive PDO phase provided favorable oceanographic conditions for the habitats of O. bartramii, whereas a lower temperature on the fishing ground during the El Niño years over the negative PDO phase generally corresponded to a low CPUE. The same correlation was also found between CPUE and Chl a concentration anomaly. A possible explanation was proposed that the CPUE was likely related to the climate-induced variability of the large-scale circulation in the Northwest Pacific Ocean:high squid abundance often occurred in a year with a significant northward meander of the Kuroshio Current. The Kuroshio Current advected the warmer and food-rich waters into the fishing ground, and multiple meso-scale eddies arising from current instability enhanced the food retention on the fishing ground, all of which were favorable for the life stage development of the western squid stocks. Our results help better understand the potential process that the climatic and oceanographic factors affect the abundance of the winter-spring cohort of O. bartramii in the Northwest Pacific Ocean. |
| 中文摘要: |
| 柔鱼Ommastrephes bartramii是西北太平洋重要的经济头足类鱼类，其生活史极其受到气候和环境条件的影响。本研究主要评估1995-2011年间气候模态转变和局部生物物理环境对柔鱼冬春生西部群体资源丰度年间变化的影响。结果显示，1995-2011年间太平洋年代际涛动（PDO）指数正负相位相互交替，期间共发生5次厄尔尼诺事件和8次拉尼娜事件。柔鱼资源丰度（以CPUE来表征）与PDO指数呈显著正相关，且滞后一年时间。PDO处于正位相且发生拉尼娜事件时，柔鱼渔场出现异常暖水团，通常给柔鱼栖息地提供有利环境条件；然而PDO处于负位相且发生厄尔尼诺事件时，柔鱼渔场水温异常变冷，通常导致CPUE变低。Chl-a浓度与CPUE之间存在相同的关系。此外，柔鱼资源水平与气候引起的西北太平洋海流变化紧密相关：黑潮势力变强向北入侵的年份一般柔鱼资源丰度变变高。黑潮将温暖和饵料丰度的水团输送至渔场，且形成多样的中尺度涡流，其不稳定使食物饵料滞留在渔场，以上因素均有利于柔鱼西部种群各个生活史阶段的生长。本文研究有利于帮助理解西北太平洋气候和海洋环境变化影响柔鱼冬生群体资源变动的潜在过程。 |
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