Identifying pelagic habitat hotspots of neon flying squid in the temperate waters of the central North Pacific

• Main Authors: Alabia, Irene D., Saitoh, Sei Ichi, Mugo, Robinson, Igarashi, Hiromichi, Ishikawa, Yoichi, Usui, Norihisa, Kamachi, Masafumi, Awaji, Toshiyuki, Seito, Masaki
• Other Authors: 淡路, 敏之, アワジ, トシユキ
• Format: Article in Journal/Newspaper
• Language: English
• Published: Public Library of Science 2015
• Subjects: Oyashio; Pacific; Subarctic
• Online Access: http://hdl.handle.net/2433/210354

We identified the pelagic habitat hotspots of the neon flying squid (Ommastrephes bartramii) in the central North Pacific from May to July and characterized the spatial patterns of squid aggregations in relation to oceanographic features such as mesoscale oceanic eddies and the Transition Zone Chlorophyll-a Front (TZCF). The data used for the habitat model construction and analyses were squid fishery information, remotely-sensed and numerical model-derived environmental data from May to July 1999-2010. Squid habitat hotspots were deduced from the monthly Maximum Entropy (MaxEnt) models and were identified as regions of persistent high suitable habitat across the 12-year period. The distribution of predicted squid habitat hotspots in central North Pacific revealed interesting spatial and temporal patterns likely linked with the presence and dynamics of oceanographic features in squid's putative foraging grounds from late spring to summer. From May to June, the inferred patches of squid habitat hotspots developed within the Kuroshio-Oyashio transition zone (KOTZ; 37-40°N) and further expanded north towards the subarctic frontal zone (SAFZ; 40-44°N) in July. The squid habitat hotspots within the KOTZ and areas west of the dateline (160°W-180°) were likely influenced and associated with the highly dynamic and transient oceanic eddies and could possibly account for lower squid suitable habitat persistence obtained from these regions. However, predicted squid habitat hotspots located in regions east of the dateline (180°-160°W) from June to July, showed predominantly higher squid habitat persistence presumably due to their proximity to the mean position of the seasonally- shifting TZCF and consequent utilization of the highly productive waters of the SAFZ.