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SUMMARY:The impact of sea-ice drift and ocean circulation on dispersal of 
 toothfish eggs and juveniles in the Ross Gyre and Amundsen Sea - Erik Behr
 ens\, National Institute of Water and Atmospheric Research
DTSTART:20211020T080000Z
DTEND:20211020T090000Z
UID:TALK163015@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:Knowledge about the early life history of Antarctic toothfish 
 (Dissostichus mawsoni) is still incomplete\, particularly on the spatial a
 nd temporal extent of spawning and the subsequent transport of eggs\, larv
 ae\, and juveniles from the offshore spawning areas to the continental she
 lf. This study uses a high-resolution hydrodynamic model to investigate th
 e impact of ocean circulation and sea-ice drift on the dispersal of eggs\,
  larvae\, and juvenile Antarctic toothfish. The virtual eggs are released 
 on seamounts of the Pacific-Antarctic ridge in the Ross Gyre and advected 
 using hydrodynamical model data. Particles are seeded annually over the ye
 ars 2002 to 2016 and tracked for three years after their release. Recruitm
 ent success has been evaluated based on the number of juveniles that reach
 ed known coastal recruitment areas\, between the eastern Ross and Amundsen
  Seas\, within three years. Sensitivities to certain juvenile behaviours h
 as been explored and showed that recruitment success was reduced by around
  70% if juveniles drifted with sea-ice during the second winter season as 
 this carries them into the open ocean away from the shelf region. Recruitm
 ent success increases during the second winter season if juveniles are ent
 rained in the Ross Gyre circulation or if they actively swam towards the s
 helf. These modelling results suggest that the ecological advantage of sea
 -ice association in the early life cycle of toothfish diminishes as they g
 row\, promoting a behaviour change during their second winter.
LOCATION:British Antarctic Survey\, Zoom
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