Abstract An integrated habitat suitability index (HSI) model was developed for a pelagic commercial squid Ommastrephes bartramii in the Northwest Pacific Ocean based on three crucial environmental variables: sea surface temperature (SST), chlorophyll-a concentration (Chla) and sea surface height (SSH). The model was established by data from 2006 to 2014 and validated by data in 2015 on the basis of fishing effort and CPUE (catch-per-unit-effort). Results suggested that the HSI model had good capacity to predict habitat suitability for O. bartramii. Squid habitat quality showed significant monthly variation, the ranges of suitable habitats in July and August were much larger than those in September. Besides, the latitudinal location of suitable habitats gradually moved northward from July to September. Further, the spatial extents of potential habitat of O. bartramii across months were strongly regulated by favorable environmental conditions. The variability trends of monthly CPUE and LATG (latitudinal distribution of fishing efforts) were closely associated and consistent with spatio-temporal habitat variations during 2006–2015. Moreover, climate variability strongly affected habitat variations and squid stocks. Relative to the El Nino event in 2015, the La Nina event in 2007 yielded expanded suitable habitat from July to September, consequently, the CPUE was much higher. And the potential high-quality habitats in 2007 mainly located in northern regions except July comparing to 2015, leading to the higher latitudinal distribution of LATG in August and September 2007. Our findings indicated that O. bartramii habitats obviously varied from month to month and were largely affected by environmental changes.

中文翻译：

---

远洋商业鱿鱼潜在栖息地的时空变化

摘要 基于海面温度 (SST)、叶绿素 a 浓度 (Chla) 和海面高度 (Chla) 三个关键环境变量，为西北太平洋的远洋商业鱿鱼 Ommastrephes bartramii 开发了综合栖息地适宜性指数 (HSI) 模型。 SSH）。该模型由2006年至2014年的数据建立，并以2015年的捕捞努力量和CPUE（catch-per-unit-effort）数据为基础进行验证。结果表明，HSI 模型具有良好的预测 O. bartramii 栖息地适宜性的能力。鱿鱼生境质量呈现显着的月变化，7、8月份适宜生境范围远大于9月份。此外，7-9月适宜生境的纬度位置逐渐北移。更多，O. bartramii 跨月潜在栖息地的空间范围受到有利环境条件的强烈调节。月度 CPUE 和 LATG（捕捞努力的纬度分布）的变化趋势与 2006-2015 年的时空栖息地变化密切相关并一致。此外，气候变化强烈影响栖息地变化和鱿鱼种群。相对于 2015 年的厄尔尼诺事件，2007 年的拉尼娜事件从 7 月到 9 月扩大了适宜栖息地，因此 CPUE 高得多。与2015年相比，2007年潜在的优质生境主要分布在除7月外的北部地区，导致2007年8月和2007年9月LATG的纬度分布更高。