Revision of the population structuring of Illex argentinus (Castellanos, 1960) and a new interpretation based on modelling the spatio-temporal environmental suitability for spawning and nursery

摘要: During the last 30 years, interpretation of population structuring Illex argentinus evolved from a single to six-stock model, in which stocks are characterized by having distinct spawning seasons, areas and migration patterns. It is assumed that major activity occurs discrete pulses along outer-shelf ⁄slope off Argentina ⁄southern Brazil during late-fall ⁄winter early life stages develop near Brazil-Malvinas Confluence (BMC). Nevertheless, there inconsistencies delimitation their histories. Here, we developed model based on records seawater temperature chlorophyll-a concentration establish quality different species’ geographic distribution as nursery grounds. Whereas domain south 37� S presents marked seasonal restrictions for embryonic development breeding, coastal within 44� ‐28� highly suitable most year. Squid pre-spawning aggregations at 41� would invest less energy reach equally coast than BMC. Findings paralarvae, stranded juveniles mature squid northern Patagonia support predictions model. Based these results, reproductive‐migration patterns reviewed new proposed: spawns not only seasons slope mid ⁄outer shelf, but also conducts quasi-permanent migrations areas, resulting more continuous pattern recruitment previously considered weak stock differentiation.