The São Paulo shelf (SE Brazil) as a nursery ground for Doryteuthis plei (Blainville, 1823) (Cephalopoda, Loliginidae) paralarvae: a Lagrangian particle-tracking Individual-Based Model approach
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The São Paulo shelf ranges from ~23°S to 25°S, comprising nearly 622 km of shoreline. This region sustains historical landings of the tropical arrow squid Doryteuthis plei. As in other coleoid cephalopods, the broodstock dies following spawning and the continuance of the population relies exclusively upon the survival of the paralarvae, which are very sensitive to oceanographic conditions. As a first step towards the understanding of paralarval transport, the shelf area was evaluated in terms of retention/dispersion potential. A Lagrangian particle-tracking Individual-Based Model was set up using a 3D Princeton Ocean Model model forced with in situ data obtained from July 2009 to July 2011. Neutrally buoyant particles were released every first day of every month in the model, and tracked for 30 days. The retention potential was high for particles released from the bottom all over the study area from the coast to the shelf break (200 m isobath). Offshore losses showed a marked seasonality. Regarding inshore losses, the percentage of particles beached was constant year round and smaller than offshore losses, being higher south of 24°S. Simulation results seem to agree with present knowledge of the reproductive behaviour of the species in the region.
KeywordsLarval dispersal Squid Hydrodynamics Modelling SW Atlantic Retention
This study is one of the results of the “The squid (Cephalopoda: Loliginidae) as a fishery resource on the northern coast of São Paulo: population dynamics, fisheries oceanography, and the human dimension” project funded by the FAPESP/BIOTA Program (2010/50183-6). RSM is supported by a FAPESP post-doc fellowship (2010/15978-8). We extend our gratitude to the University of São Paulo Extension Dean (PRCEX-USP 12.1.895.21.4) and FAPESP (2012/14140-6) for the financial support provided to attend the CIAC’2012 (Cephalopod International Advisory Council Symposium) in Florianópolis, where this study was presented. The help provided by Christophe Lett and Philipe Verley (Institut de recherche pour le développement—IRD, France) in the early stages of this study is fully and gratefully appreciated. Special thanks to Tito Conte (Oceanographic Institute, University of São Paulo) for his assistance with the R scripts. MAG acknowledges the CNPq (Brazilian Research Council) for the productivity grant (309732/2011-5).
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