Predicting summer pelagic habitat hotspots of neon flying squid (Ommastrephes bartramii) in the western North Pacific
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1 Predicting summer pelagic habitat hotspots of neon flying squid (Ommastrephes bartramii) in the western North Pacific Irene D. Alabia 1, Sei-Ichi Saitoh 1, Hiromichi Igarashi 2, Yoichi Ishikawa 2, Norihisa Usui 3, Masafumi Kamachi 3, Toshiyuki Awaji 4 & Masaki Seito 5 1 Graduate School of Fisheries Sciences, Hokkaido University 2 JAMSTEC, 3 MRI, 4 Kyoto University & 5 APITRC PICES 2013
2 BACKGROUND Neon flying squid distribution
3 BACKGROUND North Pacific population & migratory patterns Two spawning cohorts: autumn cohort: zonal distribution east of seamounts 1 winter cohort Seasonal migrations are regulated by reproduction and foraging 2 Redrawn from Ichii et al Chen & Chiu 2003; 2 Bower & Ichii,2005
4 OBJECTIVES (1) Deduce the influence importance of oceanographic proxies to squids pelagic habitat (2) Characterize the spatio-temporal patterns of squids pelagic habitat hotspots (3) Understand the physical mechanism that relates to squid aggregations
5 Study area DATA & METHODS
6 DATA & METHODS Datasets Environmental variables Abbrev. Unit Sea surface temperature SST Source Temporal Resolution Source Resolution o C AVHRR daily 25 km Sea surface salinity SSS PSU MOVE-MRI 1 5-day 10 km Sea surface height SSH cm AVISO daily 25 km Eddy kinetic energy EKE cm 2 s -2 AVISO daily 33 km Mixed layer depth MLD m MOVE-MRI 5-day 10 km Squid Fishery Data Description Source Temporal coverage Squid CPUE (tons/day) Daily point data APITRC May-July MOVE: Meteorological Research Institute Ocean Variational Estimation System
7 DATA & METHODS Squid habitat hotspots detection Data extraction Monthly Predicted CPUE GAM 1 construction ln (CPUE)= a + s(sst) + s(sss) + s(ssh) + s(eke) + s(mld)
8 DATA & METHODS Persistence of squid habitat hotspots Predicted CPUE normalization HSI Y fit max Y min Y fit fit min Y fit Y fit - predicted CPUE Y min - minimum predicted CPUE Y max - maximum predicted CPUE HSI thresholding (1) Quartile analysis (2) Minimal Predicted Area [2] Binary classification & grid operation MPA HSI threshold 0.34 n i 1 m i m i - monthly binary grid at year i Persistent habitat hotspots mapping 2 Engler et al 2004
9 RESULTS & DISCUSSION Key findings: Relative importance of environmental factors to squid habitat Objective 1 Environmental Covariates With the variable Without the variable All variables AIC CDE (%) AIC CDE (%) AIC CDE (%) SST SSS SSH EKE MLD Primary contribution from SSS,EKE and SSH: squid association with small-scale salinity fronts & eddies SST with lowest contribution: homogeneous spatial pattern due to increased insolation CDE: Cumulative Deviance Explained
10 RESULTS & DISCUSSION Key findings: Spatial-temporal patterns of summer pelagic habitat hotspots Objective 2 May June Potential squid habitat: Northern transition zone & SAFZ July Northward retreat of fishing fleets from May-July
11 RESULTS & DISCUSSION (2) Key findings: Persistence of summer squid pelagic habitat hotspots across years Objective 2 May June Proximal to major frontal systems - subarctic front (33.8) & TZCF (18 C) July Squid fishery (May-June) Transition zone (36-40 N) eddies & fronts low hotspot persistence
12 RESULTS & DISCUSSION Key findings: Potential physical mechanisms of squid aggregations Objective 3 June June
13 SUMMARY & CONCLUSION While environmental proxies exhibit differences in model contribution, their combination shaped the squid pelagic habitat in the North Pacific. Squid hotspots persistence is associated with the predictability & dynamics of oceanographic features. Squids recognize & track persistent as well as ephemeral cues from its environment for optimal foraging.
14 ACKNOWLEDGEMENT RECCA promotes R&D to provide scientific knowledge obtained by the climate change projection for the regional (prefectures or cities) adaptation. This study is supported by RECCA project, MEXT as one of 12 themes An Innovative Method of Forecasting Ocean Circulation and Fishery- Resource Variabilities Linked to Climate Change for Operational Use (PI: Toshiyuki Awaji, Kyoto Univ. & JAMSTEC, Co-PIs: Sei-Ichi Saitoh, Hokkaido Univ.)
15 Thank you for your attention
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Title Identifying pelagic habitat temperate waters of the central hotspot Nor Alabia, Irene D.; Saitoh, Sei Ichi; Author(s) Hiromichi; Ishikawa, Yoichi; Usui, Masafumi; Awaji, Toshiyuki; Seito, Citation
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